Efeito agudo do alongamento passivo-estático dos extensores do joelho na aterrissagem

Abstract

Landing is considered one of the sport movements with high acute and chronic injury risk. Stretching exercises are a widespread preparation practice before sport activities that involve landings. It could be expect that stretch-induced changes affect the ability to land. Therefore the aim of this study was to verify the acute effect of quadriceps passive-static stretching on kinetic and kinematics variables of landings after jumps and falls from different heights. Thirty male physical education students (age: 24,6 ± 4,4 years; body mass: 71,2 ± 8,2 kg; height: 175,3 ± 7,2 cm) followed anexperimental (with previous stretching exercises) and control design (without previous stretching exercises) and landed after falls from different heights (30, 50 and 70 cm) and after a maximal Squat (SJ) and Countermovement Jump (CMJ). In the experimental group the Fz máx increased after the passive-static stretching only for the landings after falls of 50 and 70 cm. Higher Range of Motion (ROM) values werefound during landings after falls from 50 cm height (angle of the ankle and the knee), 70 cm height (angle of the knee and of the hip) and CMJ (angle of the ankle and the knee). The time between first ground contact and lowest Center of Gravity (CG) position was significantly greater for landings after CMJ. The results suggest that the absorption of impact forces and the movement pattern are influenced by stretching inlanding situations that represent a greater demand on the muscular-skeletal system.