Elementos relativos de resistência isoinercial durante um exercício de agachamento afetam a potência excêntrica máxima

Abstract

INTRODUCTION: Controlled eccentric training offers benefits for injury prevention. Isoinertial devices are most effective for applying concentric and eccentric overloads, but the role of relative elements such as velocity, acceleration, force and power has yet to be fully elucidated. The present study aimed to evaluate the influence of relative elements on different profiles of maximum eccentric power. METHODS: Thirty-eight active adults were divided by maximum eccentric power profiles: high power group A (n=20) and low power group B (n=18). They performed squats to failure using an isoinertial conical pulley, monitored by an optical encoder. Maximum and average speed, acceleration, strength and average power were evaluated during the concentric and eccentric phases. RESULTS: Group A performed the exercise faster, with higher peaks and average acceleration. The correlations between maximum eccentric power and each relative element were as follows: almost perfect with maximum speed; very large with average concentric power, average velocity and acceleration, average eccentric power, average concentric force, and maximum acceleration; moderate correlations with maximal eccentric strength and mean eccentric strength. CONCLUSIONS: Relative elements affect maximal eccentric power during the isoinertial squat exercise.