The purpose of this study is to determine differences in lower extremity landing biomechanics and real-world physical activity between individuals with patellar tendinopathy compared to individuals without patellar tendinopathy,and to determine the acute effects of an isometric loading intervention on lower extremity landing biomechanics in individuals with patellar tendinopathy.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
43
5 sets of 45-seconds quadriceps contraction, each followed by 2-minutes of rest.
5 sets of 45-seconds intervals without quadriceps contraction, each followed by 2-minutes of rest.
Sports Medicine Research Laboratory
Chapel Hill, North Carolina, United States
Difference in the change in mean internal knee extension moment during landing between groups
Angular force or moment will be measured in Nm/kg\*m where "Nm" represents angular force and "kg\*m" represents normalization to body weight and height.
Time frame: Pre- and post-intervention condition (~30 minutes)
Difference in the change in mean internal hip flexion moment during landing between groups
Angular force or moment will be measured in Nm/kg\*m where "Nm" represents angular force and "kg\*m" represents normalization to body weight and height.
Time frame: Pre- and post-intervention condition (~30 minutes)
Difference in the change in mean peak vertical ground reaction force during landing between groups
Vertical ground reaction force will be measured in N(BW) where "N" is a measure of force and "BW" represents normalization to body weight.
Time frame: Pre- and post-intervention condition (~30 minutes)
Difference in the change in mean peak vertical ground reaction force loading rate during landing between groups
Vertical ground reaction force loading rate will be measured in N(BW)/s where "N" is a measure of force and "BW" represents normalization to body weight and "s" is the time unit seconds.
Time frame: Pre- and post-intervention condition (~30 minutes)
Difference in the change in mean peak patellar tendon force during landing between groups
Patellar tendon force will be measured in N(BW) where "N" is a measure of force and "BW" represents normalization to body weight.
Time frame: Pre- and post-intervention condition (~30 minutes)
Difference in average steps-per-day between groups
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Steps-per-day calculated by an ActiGraph GT9X Link Accelerometer (ActiGraph Corporation, Pensacola, FL) wearable physical activity device worn at the hip using a belt clip.
Time frame: Day 1 - Day 7
Difference in average minutes of moderate-to-vigorous physical activity (MVPA) between groups
MVPA calculated by an ActiGraph GT9X Link Accelerometer (ActiGraph Corporation, Pensacola, FL) wearable physical activity device worn at the hip using a belt clip.
Time frame: Day 1 - Day 7
Difference in change in anterior knee pain (self-reported via visual analog scale (0-10)) between groups
A standard visual analog scale (0-10) will be utilized to assess pain, where 0=complete absence of pain and 10=worst pain imaginable (higher scores indicate worse pain). This scale will be delivered verbally and the participants will respond verbally.
Time frame: Pre- and post-intervention condition (~10 minutes)