Evaluation of the muscle failure of knee's flexors and extensors in active and sedentary women

Abstract

Introduction: Muscle fatigue is directly associated with injuries in the locomotor system and is a risk factor for injuries, especially in the knee joint, which may induce a decline in proprioception, causing a decrease in body stability. The isokinetic dynamometer is an instrument of great importance in the measurement of variables such as strength, speed, power, and fatigue. It also provides the analysis of torque curves by angular position, allowing the identification of deficits through the evaluation of muscular capacity at each point of the amplitude. Objectives: Evaluate the muscular fatigue of knee flexors and extensors in active and sedentary women. Methodology: A cross-sectional study was carried out by applying the International Physical Activity Questionnaires (IPAQ), the Physical Activity Readiness Questionnaire (PAR-Q) a functional clinical examination to ensure safety during Isokinetic Dynamometry, performed in 3 sets of 5 repetitions of knee flexion and extension movements at speeds 120°/s, 180°/s and 240°/s., with 25 women, 10 active and 15 sedentary. Results: Sedentary women had a higher fatigue index, and this difference was significant in the left hamstrings. Conclusions: The higher the fatigue index, the greater the risk for the development of injuries and a means of prevention is the practice of regular physical activity, which may interfere positively in the functional capacity of individuals.