Introduction: warming up has the function of preparing the body structures for a given task to be performed during sports, increasing body and muscle temperature, focusing on improving performance. Therefore, the use of the blood flow restriction technique (BFR) can be seen as a promising alternative for promoting greater mechanical and muscular stress, thus providing a more efficient warm-up and optimizing performance. Objectives: to analyze the effects of RFS used during low-intensity warm-up compared with low-intensity and high-intensity warm-up without RFS on performance (jump test and 30-meter sprint test) and skin surface temperature. In addition to analyzing and comparing, after the warm-up protocols with and without RFS, the acute responses on perceptual outcomes (perception of pain, change in sensitivity, subjective perception of exertion and perception of discomfort in relation to RFS) and muscle outcomes (tonus , muscle stiffness and elasticity). Methods: a randomized controlled clinical trial will be carried out, with 33 amateur soccer players aged between 18 and 35 years who will be randomly divided into three groups: low-intensity warm-up without RFS (30% VO2max), high-intensity warm-up without RFS ( 80% VO2max) and low-intensity warm-up associated with BFR (80% of total occlusion pressure) \[30% VO2max-BFR\]. All groups will carry out the heating protocol and the outcomes will be evaluated at baseline and immediately after the end of the heating, as well as 10 and 20 minutes after its completion, namely: skin surface temperature through thermography; tone, stiffness and muscle elasticity by myotometry, subjective perception of pain (VAS); pain threshold through the pressure algometer; subjective perception of exertion (BORG scale); perception of discomfort in relation to RFS (LIKERT-CR-10 scale); 30-meter sprints measured through photocells and vertical jump, measured through the force platform. Descriptive statistics will be used and comparisons will be made using the generalized linear mixed model, assuming a significance level of p\<0.05.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
DOUBLE
Enrollment
108
The warm-up exercise will be performed on a treadmill.
The warm-up exercise will be performed on a treadmill and pressure cuffs will be used for the blood flow restriction technique.
Carlos Alberto Toledo Teixeira Filho
Presidente Prudente, São Paulo, Brazil
Franciele Marques Vanderlei
Presidente Prudente, São Paulo, Brazil
Temperature
Skin surface temperature will be evaluated using a thermographic camera
Time frame: At the baseline
Temperature
Skin surface temperature will be evaluated using a thermographic camera
Time frame: Immediately after warm-up
Performance in Squat Jump Test
The squat jump test will be performed at jumping platform (Multisprint, Hidrofit, Brazil)
Time frame: At the baseline
Performance in Squat Jump Test
The squat jump test will be performed at jumping platform (Multisprint, Hidrofit, Brazil)
Time frame: Immediately after warm-up
Performance in 30 meter sprint
the sprint test will be performed in a hall and two pairs of photoelectric cells (Multisprint®, Hidrofit, Brazil) will be used with an accuracy of 0.01 seconds.
Time frame: At the baseline
Performance in 30 meter sprint
the sprint test will be performed in a hall and two pairs of photoelectric cells (Multisprint®, Hidrofit, Brazil) will be used with an accuracy of 0.01 seconds.
Time frame: Immediately after warm-up
Pain threshold
To assess the pain threshold, the pressure algometer will be applied at 10 specific locations on the lower limb
Time frame: At the baseline
Pain threshold
To assess the pain threshold, the pressure algometer will be applied at 10 specific locations on the lower limb
Time frame: Immediately after warm-up
Muscle Pain
The subjective evaluation of pain will be obtained through the Visual Analogue Scale (VAS), graded from 0 to 10, with zero being the total absence of pain and 10 the maximum level of pain supported by the participan
Time frame: At the baseline
Muscle Pain
The subjective evaluation of pain will be obtained through the Visual Analogue Scale (VAS), graded from 0 to 10, with zero being the total absence of pain and 10 the maximum level of pain supported by the participan
Time frame: Immediately after warm-up
Perceived Effort Scale (Borg)
The degree of subjective exertion reported by the participants in relation to the lower limbs will be analyzed by Borg's scale of perception of effort of 0 to 10 points, 0 being "very easy" and 10 being "exhaustive."
Time frame: At the baseline and Immediately after warm-up
Perceived discomfort Scale (Likert-RFS)
The degree of subjective discomfort reported by the participants in relation to the lower limbs refferd a blood flow restriction will be analyzed by Likert Scale of perception of effort of 0 to 10 points, 0 being "no discomfort" and 10 being "very discomfortable."
Time frame: At the baseline and Immediately after warm-up
Resistance through Bioimpedance analysis (BIA)
Evaluation of tissue resistance, the higher the value, the worse the result
Time frame: At the baseline and Immediately after warm-up
Reactance through Bioimpedance analysis (BIA)
Evaluation of tissue reactance, the higher the value, the better the cell integrity
Time frame: At the baseline and Immediately after warm-up
Phase angle through Bioimpedance analysis (BIA)
Assessment of the phase angle, the higher the value, the better the condition of the participant
Time frame: At the baseline and Immediately after warm-up
Tone muscular through Myotonometry used the MyotonPRO equipment
Natural Oscillation Frequency \[Hz\], characterizing Tone of the muscles: quadriceps femoris, biceps femoris, semitendinosus, triceps surae and tibialis anterior
Time frame: At the baseline and Immediately after warm-up
Stiffness through Myotonometry used the MyotonPRO equipment
Mechanical Stress Relaxation Time \[ms\] featuring muscle elasticity of the muscles: quadriceps femoris, biceps femoris, semitendinosus, triceps surae and tibialis anterior
Time frame: At the baseline and Immediately after warm-up
heart rate variability indices in the time domain
Mean RR, SDNN e rMSSD
Time frame: At the baseline time (30 minutes rest in the supine position), during the warm-up (15 minutes in the treadmill) and immediately after the warm-up (60 minutes rest in the supine position)
heart rate variability indices in the frequency domain
LF and HF in nu and ms2
Time frame: At the baseline time (30 minutes rest in the supine position), during the warm-up (15 minutes in the treadmill) and immediately after the warm-up (60 minutes rest in the supine position)
heart rate variability indices analyzed in the Poincaré plot
SD1 and SD2 in ms
Time frame: At the baseline time (30 minutes rest in the supine position), during the warm-up (15 minutes in the treadmill) and immediately after the warm-up (60 minutes rest in the supine position)
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