Effects of a PNF stretching program on jumping and flexibility in professional futsal players
Abstract
The purpose of this study was to examine the effects of a stretching program with the contraction-relaxation-agonist-contraction technique (CRAC) on jumping performance (JP) and range of motion (ROM). A total of 21 elite futsal players participated in the present study. Participants were assigned to a control group (CG) and an experimental group (EG) according to their jumping ability. Before and after the intervention, the JP and ROM of hip flexion with the extended knee (FCRE) and dorsi-flexion of the ankle (DFTRE) were measured. For the measurement of the JP and the ROM, a contact platform and an ISOMED inclinometer were used, respectively. The EG performed a stretching program in the hamstrings and triceps sural for 4 weeks with a weekly frequency of 5 days. The players significantly increased the FCRE ROM (p = 0.02) with strong effect (hp2 = 0.730) and ROM DFTRE (p = 0.01) with moderate effect (hp2 = 0.546), of the values of CMJ (p = 0.03) with strong effect (hp2 = 0.650) and of the values of index of utilization of the elastic capacity [IACE] (p = 0.04) with strong effect (hp2 = 0,742) in the EG after the stretching. The CG players significantly increased the performance in the CMJ (p = 0.02) with moderate effect (hp2 = 0.519) and IACE (p = 0.04) with moderate effect (hp2 = 0.548); in addition, significant differences were observed in the values of IACE (p = 0.02) between both groups. The results of this study allow us to conclude that a training period with the CRAC technique improves ROM and JP in professional futsal players.
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References
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