Back Squat Case Study
The subjects were to execute 9 maximum vertical jumps (1 minute rest between each) and 3 of those being from a recommended starting position. Another 3 squats were performed by the subjects selecting their best deep squat position, followed by the last 3 out of an upright posture. All participants were required to have hands by their given angles and center of mass height. The positioning of hands were of importance because it helped to keep subjects in their appropriate position. Kinematic data was retrieved by using a Pro-Reflex Motion Analysis System at 240-Hz. Ground Reaction Force (GRF) was analyzed by a force platform at 1200-HZ, and maximum vertical jump was inferred once the subject lost contact with the ground. Reflective markers were placed on the subjects’ acromion process, great trochanter, lateral femoral condyle, lateral malleolus, and base of 5th metatarsal. The resultant movement at the ankle, knee, and hip joints were configured and statistical analysis of variance (ANOVA) was used to interpret the …show more content…
The sessions consisted of properly doing a 1 repetition maximum (1-RM) parallel back squat (20 kg Olympic barbell), a potentiation treatment, and control treatment. The potentiation treatment required participants to warm up by doing 5 to 10 dynamic exercises, followed by 3 rounds of parallel back squats. The first round was 1x5 reps at 30% 1-RM, second round 1x4 reps at 50% 1-RM, and final round 1x3 reps at 70%. Next, for the control treatment, participants performed 1 countermovement vertical jump (CMJs) for every 3 minutes. The vertical jumps would total out to be 10 CMJs, and needed to be done from a force platform Kistler 9286AA, 1200-HZ) in order to ensure correct calculations of vertical stiffness (VStiff) and height of jump (JH).
In conclusion, data calculated 1-RM parallel back squat for the male participants were between 159 kg to 181 kg, whereas the female participants ranged between 79 kg to 92 kg. Also, data did not show any differences for male or female participants during their JH or VStiff. The study concluded there are small changes when correlating parallel back squats to an individual’s maximum vertical jump, but resistance exercises could lead to performance improvements in some