Recent evidence has shown that transcutaneous electrical nerve stimulation (TENS) was effective in improving the cognitive function in healthy adult and people with dementia. However, lacking of evidence investigated the effect of TENS in improving the cognitive function and reversing the occurrence of dementia during the period of mild cognitive impairment (MCI), which is the crucial period to prevent the significant loss of cognition function. Therefore, the main objective of this study is to investigate the optimal TENS treatment protocol in improving the cognitive function in older adults with MCI.
This study aims to investigate the effectiveness of 3 intervention protocols (1) In the T1 TENS group, the subject will receive TENS on T1 spine. (2) In the vagus nerve TENS group, the subject will receive TENS on the concha of left outer ear. (3) In the sham stimulation group, the subject will receive sham stimulation on the T1 spine, in improving the cognitive function in older adults with MCI.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
90
The subjects in Group A will received TENS (Burst mode, 9 pulses per burst, pulse frequency =160Hz, burst frequency=2Hz, intensity was set to trigger visible muscular twitches). Two 2 x 3 cm electrodes was attached on T1 level with 2 cm from the spine. Previous study has shown that it was effective to improve the cognitive function in subjects with Alzheimer's disease.
The subjects in Group B will received TENS (25Hz, 0.5mA) on the concha of left outer ear. The electrical stimulation was generated by the portable neurostimulator (Nemos®, Cerbomed, Erlangen, Germany) and was delivered by a titanium electrodes positioning on top of a silicon earplug. Previous study has shown that it was effective to improve the Accelerate extinction memory formation and retention in healthy young adults.
The subjects in Group C will receive 30 min sham electrical stimulation on T1 by a placebo-TENS device. The Placebo-TENS was applied by an apparently identical TENS unit. The unit's power indicator light was illuminated, but the unit's electrical circuit had been manually disconnected inside. In order to shape the common mindset, all subjects (except those in the Control group) were informed that they might or might not feel an electrical current, as different stimulation parameters were being applied.
The Hong Kong Polytechnic University
Hong Kong, Hong Kong
Montreal cognitive assessment (MoCA)
The overall cognitive function is measured by the Cantonese version of MoCA. The MoCA is a widely used 10-minute cognitive screening test for detection of MCI. The MoCA test includes 8 parts with a maximum score of 30. A higher score indicated a better cognitive function. The Cantonese version of MoCA has shown good to excellent inter-rater (ICC=0.987, p\<0.001) reliability in Chinese older adults.
Time frame: Baseline (0 week)
Montreal cognitive assessment (MoCA)
The overall cognitive function is measured by the Cantonese version of MoCA. The MoCA is a widely used 10-minute cognitive screening test for detection of MCI. The MoCA test includes 8 parts with a maximum score of 30. A higher score indicated a better cognitive function. The Cantonese version of MoCA has shown good to excellent inter-rater (ICC=0.987, p\<0.001) reliability in Chinese older adults.
Time frame: Mid-intervention (5 week)
Montreal cognitive assessment (MoCA)
The overall cognitive function is measured by the Cantonese version of MoCA. The MoCA is a widely used 10-minute cognitive screening test for detection of MCI. The MoCA test includes 8 parts with a maximum score of 30. A higher score indicated a better cognitive function. The Cantonese version of MoCA has shown good to excellent inter-rater (ICC=0.987, p\<0.001) reliability in Chinese older adults.
Time frame: Post-intervention (10 week)
Montreal cognitive assessment (MoCA)
The overall cognitive function is measured by the Cantonese version of MoCA. The MoCA is a widely used 10-minute cognitive screening test for detection of MCI. The MoCA test includes 8 parts with a maximum score of 30. A higher score indicated a better cognitive function. The Cantonese version of MoCA has shown good to excellent inter-rater (ICC=0.987, p\<0.001) reliability in Chinese older adults.
Time frame: 1 month follow-up (14 week)
Digit Span Test
The verbal short-term memory and working memory is measured by the digit span test. The subject was required to listen to a series of random numbers carefully and then repeated them in forward (forward digit span test) and backward (backward digit span test) order. Continue in the same manner by increasing the series of numbers. The difficulty will be increased when the number in a sequence increased. The forward digit span task requires verbal working memory and attention, while the backwards digit span task additionally tests cognitive control and executive function. The more correct trials performed indicated better short-term memory and work memory.
Time frame: Baseline (0 week)
Digit Span Test
The verbal short-term memory and working memory is measured by the digit span test . The subject was required to listen to a series of random numbers carefully and then repeated them in forward (forward digit span test) and backward (backward digit span test) order. Continue in the same manner by increasing the series of numbers. The difficulty will be increased when the number in a sequence increased. The forward digit span task requires verbal working memory and attention, while the backwards digit span task additionally tests cognitive control and executive function.The more correct trials performed indicated better short-term memory and work memory.
Time frame: Mid-intervention (5 week)
Digit Span Test
The verbal short-term memory and working memory is measured by the digit span test. The subject was required to listen to a series of random numbers carefully and then repeated them in forward (forward digit span test) and backward (backward digit span test) order. Continue in the same manner by increasing the series of numbers. The difficulty will be increased when the number in a sequence increased. The forward digit span task requires verbal working memory and attention, while the backwards digit span task additionally tests cognitive control and executive function.The more correct trials performed indicated better short-term memory and work memory.
Time frame: Post-intervention (10 week)
Digit Span Test
The verbal short-term memory and working memory is measured by the digit span test . The subject was required to listen to a series of random numbers carefully and then repeated them in forward (forward digit span test) and backward (backward digit span test) order. Continue in the same manner by increasing the series of numbers. The difficulty will be increased when the number in a sequence increased. The forward digit span task requires verbal working memory and attention, while the backwards digit span task additionally tests cognitive control and executive function.The more correct trials performed indicated better short-term memory and work memory.
Time frame: 1 month follow-up (14 week)
Visual Memory Span Test
The visual memory is measured by the visual memory span test. The subject was required to observe a given order to tap a number of block as shown by the examiners and then repeat them in forward and backward order. The difficulty will be increased when the number of blocks in a sequence increased. The more correct trials performed indicated better visual memory.
Time frame: Baseline (0 week)
Visual Memory Span Test
The visual memory is measured by the visual memory span test. The subject was required to observe a given order to tap a number of block as shown by the examiners and then repeat them in forward and backward order. The difficulty will be increased when the number of blocks in a sequence increased. The more correct trials performed indicated better visual memory.
Time frame: Mid-intervention (5 week)
Visual Memory Span Test
The visual memory is measured by the visual memory span test. The subject was required to observe a given order to tap a number of block as shown by the examiners and then repeat them in forward and backward order. The difficulty will be increased when the number of blocks in a sequence increased. The more correct trials performed indicated better visual memory.
Time frame: Post-intervention (10 week)
Visual Memory Span Test
The visual memory is measured by the visual memory span test. The subject was required to observe a given order to tap a number of block as shown by the examiners and then repeat them in forward and backward order. The difficulty will be increased when the number of blocks in a sequence increased. The more correct trials performed indicated better visual memory.
Time frame: 1 month follow-up (14 week)
Stroop Color and Word Test
The ability to inhibit cognitive interference is measured by the Stroop Color and Word Test. The Stroop Test consists of 3 subtasks. The first subtask shows color dots (green, blue, yellow, red) in random order. The second subtask shows the words (green, blue, red, yellow) in random order. The third task showed color words (green, blue, red, yellow) printed in a different ink color (i.e., the word blue printed in yellow ink). Participants are required to name the color of the ink as quickly as possible within 45 s in each task. The completion time and number of error is recorded in each task. The interference ratio of will be calculated as the completion time of the third task/the completion time of the first task. A higher interference score indicated poorer interference control.
Time frame: Baseline (0 week)
Stroop Color and Word Test
The ability to inhibit cognitive interference is measured by the Stroop Color and Word Test. The Stroop Test consists of 3 subtasks. The first subtask shows color dots (green, blue, yellow, red) in random order. The second subtask shows the words (green, blue, red, yellow) in random order. The third task showed color words (green, blue, red, yellow) printed in a different ink color (i.e., the word blue printed in yellow ink). Participants are required to name the color of the ink as quickly as possible within 45 s in each task. The completion time and number of error is recorded in each task. The interference ratio of will be calculated as the completion time of the third task/the completion time of the first task. A higher interference score indicated poorer interference control.
Time frame: Mid-intervention (5 week)
Stroop Color and Word Test
The ability to inhibit cognitive interference is measured by the Stroop Color and Word Test. The Stroop Test consists of 3 subtasks. The first subtask shows color dots (green, blue, yellow, red) in random order. The second subtask shows the words (green, blue, red, yellow) in random order. The third task showed color words (green, blue, red, yellow) printed in a different ink color (i.e., the word blue printed in yellow ink). Participants are required to name the color of the ink as quickly as possible within 45 s in each task. The completion time and number of error is recorded in each task. The interference ratio of will be calculated as the completion time of the third task/the completion time of the first task. A higher interference score indicated poorer interference control.
Time frame: Post-intervention (10 week)
Stroop Color and Word Test
The ability to inhibit cognitive interference is measured by the Stroop Color and Word Test. The Stroop Test consists of 3 subtasks. The first subtask shows color dots (green, blue, yellow, red) in random order. The second subtask shows the words (green, blue, red, yellow) in random order. The third task showed color words (green, blue, red, yellow) printed in a different ink color (i.e., the word blue printed in yellow ink). Participants are required to name the color of the ink as quickly as possible within 45 s in each task. The completion time and number of error is recorded in each task. The interference ratio of will be calculated as the completion time of the third task/the completion time of the first task. A higher interference score indicated poorer interference control.
Time frame: 1 month follow-up (14 week)
Face Recognition Test
The visual, nonverbal long-term memory is measured by the face recognition test from the Rivermead Behavioral Memory Test (RMBT). Fifteen faces are shown successively to the subject. After an occupied interval of 5 minutes, the subjects are required to select the original 15 faces from a set of 30. The recognition score is the number of correct answers minus the number of incorrect answers. The recognition score is ranged from -15 to 15. A higher score indicated a better visual, nonverbal long term memory.
Time frame: Baseline (0 week)
Face Recognition Test
The visual, nonverbal long-term memory is measured by the face recognition test from the Rivermead Behavioral Memory Test (RMBT). Fifteen faces are shown successively to the subject. After an occupied interval of 5 minutes, the subjects are required to select the original 15 faces from a set of 30. The recognition score is the number of correct answers minus the number of incorrect answers. The recognition score is ranged from -15 to 15. A higher score indicated a better visual, nonverbal long term memory.
Time frame: Mid-intervention (5 week)
Face Recognition Test
The visual, nonverbal long-term memory is measured by the face recognition test from the Rivermead Behavioral Memory Test (RMBT). Fifteen faces are shown successively to the subject. After an occupied interval of 5 minutes, the subjects are required to select the original 15 faces from a set of 30. The recognition score is the number of correct answers minus the number of incorrect answers. The recognition score is ranged from -15 to 15. A higher score indicated a better visual, nonverbal long term memory.
Time frame: Post-intervention (10 week)
Face Recognition Test
The visual, nonverbal long-term memory is measured by the face recognition test from the Rivermead Behavioral Memory Test (RMBT). Fifteen faces are shown successively to the subject. After an occupied interval of 5 minutes, the subjects are required to select the original 15 faces from a set of 30. The recognition score is the number of correct answers minus the number of incorrect answers. The recognition score is ranged from -15 to 15. A higher score indicated a better visual, nonverbal long term memory.
Time frame: 1 month follow-up (14 week)
Picture Recognition Test
The visual, verbal long-term memory is measured by the picture recognition test from the RBMT. Line drawings of 15 common objects are presented one at a time. After an occupied interval of 5 minutes, the subjects are asked to select the original 15 pictures from a set of 30. The recognition score is calculated in the same way as in the Face Recognition test. The recognition score is ranged from -15 to 15. A higher score indicated a better visual, verbal long term memory.
Time frame: Baseline (0 week)
Picture Recognition Test
The visual, verbal long-term memory is measured by the picture recognition test from the RBMT. Line drawings of 15 common objects are presented one at a time. After an occupied interval of 5 minutes, the subjects are asked to select the original 15 pictures from a set of 30. The recognition score is calculated in the same way as in the Face Recognition test. The recognition score is ranged from -15 to 15. A higher score indicated a better visual, verbal long term memory.
Time frame: Mid-intervention (5 week)
Picture Recognition Test
The visual, verbal long-term memory is measured by the picture recognition test from the RBMT. Line drawings of 15 common objects are presented one at a time. After an occupied interval of 5 minutes, the subjects are asked to select the original 15 pictures from a set of 30. The recognition score is calculated in the same way as in the Face Recognition test. The recognition score is ranged from -15 to 15. A higher score indicated a better visual, verbal long term memory.
Time frame: Post-intervention (10 week)
Picture Recognition Test
The visual, verbal long-term memory is measured by the picture recognition test from the RBMT. Line drawings of 15 common objects are presented one at a time. After an occupied interval of 5 minutes, the subjects are asked to select the original 15 pictures from a set of 30. The recognition score is calculated in the same way as in the Face Recognition test. The recognition score is ranged from -15 to 15. A higher score indicated a better visual, verbal long term memory.
Time frame: 1 month follow-up (14 week)
Berg Balance Scale (BBS)
The functional balance ability is measured by BBS. The BBS is an ordinal scale with 14 items, each item ranged from 0-4 with a total score ranged from 0-56. The higher score indicates a better balance function. Previous study has shown that BBS has good to excellent test-retest reliability (ICC=0.77-0.886) in older adults.
Time frame: Baseline (0 week)
Berg Balance Scale (BBS)
The functional balance ability is measured by BBS. The BBS is an ordinal scale with 14 items, each item ranged from 0-4 with a total score ranged from 0-56. The higher score indicates a better balance function. Previous study has shown that BBS has good to excellent test-retest reliability (ICC=0.77-0.886) in older adults.
Time frame: Mid-intervention (5 week)
Berg Balance Scale (BBS)
The functional balance ability is measured by BBS. The BBS is an ordinal scale with 14 items, each item ranged from 0-4 with a total score ranged from 0-56. The higher score indicates a better balance function. Previous study has shown that BBS has good to excellent test-retest reliability (ICC=0.77-0.886) in older adults.
Time frame: Post-intervention (10 week)
Berg Balance Scale (BBS)
The functional balance ability is measured by BBS. The BBS is an ordinal scale with 14 items, each item ranged from 0-4 with a total score ranged from 0-56. The higher score indicates a better balance function. Previous study has shown that BBS has good to excellent test-retest reliability (ICC=0.77-0.886) in older adults.
Time frame: 1 month follow-up (14 week)
10 Meter Walking Test (10MWT)
The walking speed over a short distance is measured by the 10MWT. The subject will be asked to walk 10 meter in a normal comfortable speed and maximum speed condition, respectively. The completion time will be records by stopwatch. Each condition will be repeated for 2 times. The completion time will be averaged. The shorter the completion time, the better performance is. 10MWT has shown excellent test-retest reliability (ICC=0.98) in assessing healthy older adults.
Time frame: Baseline (0 week)
10 Meter Walking Test (10MWT)
The walking speed over a short distance is measured by the 10MWT. The subject will be asked to walk 10 meter in a normal comfortable speed and maximum speed condition, respectively. The completion time will be records by stopwatch. Each condition will be repeated for 2 times. The completion time will be averaged. The shorter the completion time, the better performance is. 10MWT has shown excellent test-retest reliability (ICC=0.98) in assessing healthy older adults.
Time frame: Mid-intervention (5 week)
10 Meter Walking Test (10MWT)
The walking speed over a short distance is measured by the 10MWT. The subject will be asked to walk 10 meter in a normal comfortable speed and maximum speed condition, respectively. The completion time will be records by stopwatch. Each condition will be repeated for 2 times. The completion time will be averaged. The shorter the completion time, the better performance is. 10MWT has shown excellent test-retest reliability (ICC=0.98) in assessing healthy older adults.
Time frame: Post-intervention (10 week)
10 Meter Walking Test (10MWT)
The walking speed over a short distance is measured by the 10MWT. The subject will be asked to walk 10 meter in a normal comfortable speed and maximum speed condition, respectively. The completion time will be records by stopwatch. Each condition will be repeated for 2 times. The completion time will be averaged. The shorter the completion time, the better performance is. 10MWT has shown excellent test-retest reliability (ICC=0.98) in assessing healthy older adults.
Time frame: 1 month follow-up (14 week)
6 Minutes Walking Test (6MWT)
The aerobic capacity and walking endurance is measured by the 6MWT. The participants will be asked to walk as far as possible for 6 minutes in the 20 meters' corridor. The walking distance in 6 minutes will be records. The longer distance the subject walk, the better endurance is. The 6MWT has shown excellent test-retest reliability (ICC=0.95) in assessing healthy older adults.
Time frame: Baseline (0 week)
6 Minutes Walking Test (6MWT)
The aerobic capacity and walking endurance is measured by the 6MWT. The participants will be asked to walk as far as possible for 6 minutes in the 20 meters' corridor. The walking distance in 6 minutes will be records. The longer distance the subject walk, the better endurance is. The 6MWT has shown excellent test-retest reliability (ICC=0.95) in assessing healthy older adults.
Time frame: Mid-intervention (5 week)
6 Minutes Walking Test (6MWT)
The aerobic capacity and walking endurance is measured by the 6MWT. The participants will be asked to walk as far as possible for 6 minutes in the 20 meters' corridor. The walking distance in 6 minutes will be records. The longer distance the subject walk, the better endurance is. The 6MWT has shown excellent test-retest reliability (ICC=0.95) in assessing healthy older adults.
Time frame: Post-intervention (10 week)
6 Minutes Walking Test (6MWT)
The aerobic capacity and walking endurance is measured by the 6MWT. The participants will be asked to walk as far as possible for 6 minutes in the 20 meters' corridor. The walking distance in 6 minutes will be records. The longer distance the subject walk, the better endurance is. The 6MWT has shown excellent test-retest reliability (ICC=0.95) in assessing healthy older adults.
Time frame: 1 month follow-up (14 week)
Time Up and Go Test (TUG)
The functional ability is measured by TUG. The subject will be asked to stand up from the chair, walk 3 meters, turn 180°, go back to the chair and then sit down. The completion time will be recorded. The subjects need to repeat the test for 2 times. The completion time of the 2 trials will be averaged.
Time frame: Baseline (0 week)
Time Up and Go Test (TUG)
The functional ability is measured by TUG. The subject will be asked to stand up from the chair, walk 3 meters, turn 180°, go back to the chair and then sit down. The completion time will be recorded. The subjects need to repeat the test for 2 times. The completion time of the 2 trials will be averaged.
Time frame: Mid-intervention (5 week)
Time Up and Go Test (TUG)
The functional ability is measured by TUG. The subject will be asked to stand up from the chair, walk 3 meters, turn 180°, go back to the chair and then sit down. The completion time will be recorded. The subjects need to repeat the test for 2 times. The completion time of the 2 trials will be averaged.
Time frame: Post-intervention (10 week)
Time Up and Go Test (TUG)
The functional ability is measured by TUG. The subject will be asked to stand up from the chair, walk 3 meters, turn 180°, go back to the chair and then sit down. The completion time will be recorded. The subjects need to repeat the test for 2 times. The completion time of the 2 trials will be averaged.
Time frame: 1 month follow-up (14 week)
Community Integration Measure
The level of community integration is assessed by Chinese version of Community Integration Measure (CIM). It is a self-report questionnaire that is easily administrated to assess the community integration level. The instrument consists of 10 items, each rated from 1 to 5, giving a total score ranging from 10 to 50. A higher score indicates greater community integration. Liu et al. (Liu et al., 2014) reports that the Chinese version of the CIM showed good test-retest reliability (ICC=0.84) in people with stroke. A pilot study with 123 people with chronic stroke conducted as part of this research showed that CIM scores were significantly correlated with peak wrist flexion torque (r=0.203, p\<0.05), Wolf Motoro Function Test (WMFT) scores (r=0.194, p\<0.05) and Barthel Index scores (r=0.194, p\<0.05).
Time frame: Baseline (0 week)
Community Integration Measure
The level of community integration is assessed by Chinese version of Community Integration Measure (CIM). It is a self-report questionnaire that is easily administrated to assess the community integration level. The instrument consists of 10 items, each rated from 1 to 5, giving a total score ranging from 10 to 50. A higher score indicates greater community integration. Liu et al. reports that the Chinese version of the CIM showed good test-retest reliability (ICC=0.84) in people with stroke. A pilot study with 123 people with chronic stroke conducted as part of this research showed that CIM scores were significantly correlated with peak wrist flexion torque (r=0.203, p\<0.05), WMFT scores (r=0.194, p\<0.05) and Barthel Index scores (r=0.194, p\<0.05).
Time frame: Mid-intervention (5 week)
Community Integration Measure
The level of community integration is assessed by Chinese version of Community Integration Measure (CIM). It is a self-report questionnaire that is easily administrated to assess the community integration level. The instrument consists of 10 items, each rated from 1 to 5, giving a total score ranging from 10 to 50. A higher score indicates greater community integration. Liu et al. reports that the Chinese version of the CIM showed good test-retest reliability (ICC=0.84) in people with stroke. A pilot study with 123 people with chronic stroke conducted as part of this research showed that CIM scores were significantly correlated with peak wrist flexion torque (r=0.203, p\<0.05), WMFT scores (r=0.194, p\<0.05) and Barthel Index scores (r=0.194, p\<0.05).
Time frame: Post-intervention (10 week)
Community Integration Measure
The level of community integration is assessed by Chinese version of Community Integration Measure (CIM). It is a self-report questionnaire that is easily administrated to assess the community integration level. The instrument consists of 10 items, each rated from 1 to 5, giving a total score ranging from 10 to 50. A higher score indicates greater community integration. Liu et al. reports that the Chinese version of the CIM showed good test-retest reliability (ICC=0.84) in people with stroke. A pilot study with 123 people with chronic stroke conducted as part of this research showed that CIM scores were significantly correlated with peak wrist flexion torque (r=0.203, p\<0.05), WMFT scores (r=0.194, p\<0.05) and Barthel Index scores (r=0.194, p\<0.05).
Time frame: 1 month follow-up (14 week)
Limit of Stability (LOS)-Reaction Time
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Reaction time (RT) is used to assess the time participants take to give a movement response after cues are provided. The RT (second) in the 8 direction will be measured. The longer RT indicated poorer balance performance.
Time frame: Baseline (0 week)
Limit of Stability (LOS)-Reaction Time
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Reaction time (RT) is used to assess the time participants take to give a movement response after cues are provided. The RT (second) in the 8 direction will be measured. The longer RT indicated poorer balance performance.
Time frame: Mid-intervention (5 week)
Limit of Stability (LOS)-Reaction Time
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Reaction time (RT) is used to assess the time participants take to give a movement response after cues are provided. The RT (second) in the 8 direction will be measured. The longer RT indicated poorer balance performance.
Time frame: Post-intervention (10 week)
Limit of Stability (LOS)-Reaction Time
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Reaction time (RT) is used to assess the time participants take to give a movement response after cues are provided. The RT (second) in the 8 direction will be measured. The longer RT indicated poorer balance performance.
Time frame: 1 month follow-up (14 week)
Limit of Stability (LOS)-Movement Velocity
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Movement velocity (MV) is used to assess the average center of gravity (COG) displacement speed. The MV (degree/second) in the 8 direction will be measured. The smaller MV indicated poorer balance performance.
Time frame: Baseline (0 week)
Limit of Stability (LOS)-Movement Velocity
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Movement velocity (MV) is used to assess the average center of gravity (COG) displacement speed. The MV (degree/second) in the 8 direction will be measured. The smaller MV indicated poorer balance performance.
Time frame: Mid-intervention (5 week)
Limit of Stability (LOS)-Movement Velocity
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Movement velocity (MV) is used to assess the average center of gravity (COG) displacement speed. The MV (degree/second) in the 8 direction will be measured. The smaller MV indicated poorer balance performance.
Time frame: Post-intervention (10 week)
Limit of Stability (LOS)-Movement Velocity
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Movement velocity (MV) is used to assess the average center of gravity (COG) displacement speed. The MV (degree/second) in the 8 direction will be measured. The smaller MV indicated poorer balance performance.
Time frame: 1 month follow-up (14 week)
Limit of Stability (LOS)-Endpoint Excursion
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Endpoint excursion (EE) is used to assess how far the patient leans towards the target on his or her first attempt. The EE (%) in the 8 direction will be measured. The smaller EE indicated poorer balance performance.
Time frame: Baseline (0 week)
Limit of Stability (LOS)-Endpoint Excursion
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Endpoint excursion (EE) is used to assess how far the patient leans towards the target on his or her first attempt. The EE (%) in the 8 direction will be measured. The smaller EE indicated poorer balance performance.
Time frame: Mid-intervention (5 week)
Limit of Stability (LOS)-Endpoint Excursion
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Endpoint excursion (EE) is used to assess how far the patient leans towards the target on his or her first attempt. The EE (%) in the 8 direction will be measured. The smaller EE indicated poorer balance performance.
Time frame: Post-intervention (10 week)
Limit of Stability (LOS)-Endpoint Excursion
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Endpoint excursion (EE) is used to assess how far the patient leans towards the target on his or her first attempt. The EE (%) in the 8 direction will be measured. The smaller EE indicated poorer balance performance.
Time frame: 1 month follow-up (14 week)
Limit of Stability (LOS)-Maximum Excursion
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Maximum excursion (ME) is used to assess the maximum amount the patient leaned during the trial. The ME (%) in the 8 direction will be measured. The smaller ME indicated poorer balance performance.
Time frame: Baseline (0 week)
Limit of Stability (LOS)-Maximum Excursion
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Maximum excursion (ME) is used to assess the maximum amount the patient leaned during the trial. The ME (%) in the 8 direction will be measured. The smaller ME indicated poorer balance performance.
Time frame: Mid-intervention (5 week)
Limit of Stability (LOS)-Maximum Excursion
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Maximum excursion (ME) is used to assess the maximum amount the patient leaned during the trial. The ME (%) in the 8 direction will be measured. The smaller ME indicated poorer balance performance.
Time frame: Post-intervention (10 week)
Limit of Stability (LOS)-Maximum Excursion
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Maximum excursion (ME) is used to assess the maximum amount the patient leaned during the trial. The ME (%) in the 8 direction will be measured. The smaller ME indicated poorer balance performance.
Time frame: 1 month follow-up (14 week)
Limit of Stability (LOS)-Directional Control
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Directional control (DC) is used to assess how much of the patient's movement was in the target direction. The DC (%) in the 8 direction will be measured. The smaller DC indicated poorer balance performance.
Time frame: Baseline (0 week)
Limit of Stability (LOS)-Directional Control
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Directional control (DC) is used to assess how much of the patient's movement was in the target direction. The DC (%) in the 8 direction will be measured. The smaller DC indicated poorer balance performance.
Time frame: Mid-intervention (5 week)
Limit of Stability (LOS)-Directional Control
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Directional control (DC) is used to assess how much of the patient's movement was in the target direction. The DC (%) in the 8 direction will be measured. The smaller DC indicated poorer balance performance.
Time frame: Post-intervention (10 week)
Limit of Stability (LOS)-Directional Control
The LOS is measured by the balance plate system (Bertec, Columbus, OH). During the limits of stability task, subjects were instructed to shift their weight by moving their pelvis and torso without flexing their hips or knees, keeping their heels in contact with the force plates and their arms/hands at their sides. The subjects will be instructed to shifted his or her center of mass to forward (0°), right-forward (45°), right (90°), right-backward (135°), backward (180°), left backward (225°), left (270°) and left-forward (315°), based on a visual projection of the center of mass in the current and target locations. The duration of each weight shifting trial was 10 seconds. Directional control (DC) is used to assess how much of the patient's movement was in the target direction. The DC (%) in the 8 direction will be measured. The smaller DC indicated poorer balance performance.
Time frame: 1 month follow-up (14 week)
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