Respostas mecânicas da musculatura do joelho de bodyboarders de alto nível durante o desempenho

Abstract

Introduction: bodyboarding is a kind of surfing that has been growing very rapidly over the last decade and has now developed into one of the fastest growing water sports in the world. Objectives: evaluate the effects of fatigue on rectus femoris (RF), vastus lateralis (VL) and vastus medialis (VM) and biceps femoris (BF) and semitendinosus (ST) during a high-level bodyboard competition using tensiomyography (TMG). Methods: subjects were 11 highly experienced (years of practice: 15, SD=4.65) male bodyboarders (age: 28.17, SD=2.89, body weight: 74.83, SD=6.13kg; height: 179.25, SD=3.93cm; BMI: 23.29, SD=1.81) participating in the final of the 2010 Spanish championship. Results: the fatigue is especially evident due to a decrease in the values of relaxation time (Tr) and sustain time (Ts) caused by the specific characteristics of waves, how the waves evolve and the type of manoeuvre executed in competition due to the wave characteristics. The maximum radial displacement (Dm) value increased slightly in all muscles analysed and normalised response speed (Vrn) was stable, with a tendency to improve as athletes adapted to the type of physical effort and the environmental conditions of the competition. Conclusions: the study shows that the fatigue in the extensor and flexor muscles of the knee occurs in response to the demands of competition.