Effect of stretching series on muscle strength and power evaluated by isokinetic dynamometer in adolescents
DOI:
https://doi.org/10.11606/issn.1981-4690.2022e36185313Keywords:
Young, Muscle stretching exercises, Performance, Muscle strengthAbstract
There are still controversies about the real influence of stretching on muscle strength and power, especially in the case of adolescents. The objective of the study was to verify, through the test in an isokinetic dynamometer, the effects of stretching series on muscle strength and power, of the knee extensors and flexors of the dominant lower limb. The study was carried out with 11 male adolescents (14.36±1.36 years) with no experience in weight training. Anthropometric assessments of weight, height, BMI, skinfolds and maturation assessment were performed using a Tanner plate. The participants were submitted to the muscular strength and power test (60 and 300°/second, respectively), in the isokinetic dynamometer. On the first visit, before the test, the volunteers performed only a warm-up on an exercise bike. On the second visit, participants performed a static stretching protocol, consisting of three sets of 40 seconds, with a 30-second interval between sets for each muscle group involved. The variables analyzed were peak torque (Nm) and total work (J). A significant difference was found in only one of the analyzed variables, the peak torque (Nm) in knee flexion at 60°/second (p=0.001), the value found for the condition with stretching being higher. Regarding the total work (J) in knee extension and flexion, no significant difference was observed in any of the analyzed variables when comparing the conditions without and with stretching (p>0.05). Thus, it is concluded that for male adolescents, stretching may not influence the performance of muscle strength and power.
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