Focal Vibration for Enhancing Athletic Speed and Ppower

A linear transducer (Vitruve VBT) was used to measure the mean speed during the squat. The tether device was attached to the right side of the barbell around the widest part of the collar on the inside and this converts the subject's movement with the barbell into an electrical signal that will record the mean speed and of the exercise. Subjects will per-form 7 repetitions at 0,85 m/s at the maximum possible speed with the optimal load to generate the maximum power.

Linear transducers which have greater accuracy (5%) and reliability (ICC: 0.752; 95% CI: 0.548 - 0.855) compared to other devices in terms of velocity-based training (VBT) meas-urement.

A linear transducer (Vitruve VBT) was used to measure the mean power during the squat. The tether device was attached to the right side of the barbell around the widest part of the collar on the inside and this converts the subject's movement with the barbell into an electrical signal that will record the mean power of the exercise. Subjects will per-form 7 repetitions at 0,85 m/s at the maximum possible speed with the optimal load to generate the maximum power.

Linear transducers which have greater accuracy (5%) and reliability (ICC: 0.752; 95% CI: 0.548 - 0.855) compared to other devices in terms of velocity-based training (VBT) meas-urement.

Just after the end of the series of 7 repetitions the sensation of effort perceived by the athlete was measured with the modified BORG scale (0-10), being 0 the lowest perceived effort and 10 being the highest effort.

At the end of the free bar squat after the warm-up and the intervention, the subject will be asked if he/she has felt improvement or worsening between the first time and the last time he/she performed the test. The participant's rating of clinical change will be evaluated with a Global Rating of Change Scale (GROC scale). This is a scale of 15 items, of which +7 are improvement and -7 are deterioration, and with 1 central item with no clinical change. Values from the fourth item of improvement or deterioration will be considered clinically significant, values between the three item of improvement and the three item of deterioration will be considered as no clinically significant changes. The test-retest reliability has proven to be good (ICC 0.90).

Surface electromyography was used to evaluate the muscle activity of back and lower limb the during squatting task. The muscles assessed were vastus medialis, vastus lateralis, rectus femoris, biceps femoris, gluteus maximus and erector spinae longissimus. Data were obtained for the dominant limb defined as the one preferred to kick a ball.

the tool to be used is The mDurance® system (mDurance Solutions SL, Granada, Spain). The RMS was the principal variable recorded for muscle activity, expressed as % of MVIC (%MVIC).