Effects of Joint Kinetics on Energy Cost during Repeated Vertical Jumping

Purpose The present study was designed to investigate the effects of lower limb joint kinetics on energy cost during jumping. Methods Eight male middle and long-distance runners volunteered for the study. The subjects were asked to repeat vertical jumps at a frequency of 2 Hz for 3 min on a force platform in three different surface inclination conditions: Incline (+8°), Level (0°), and Decline (−8°). Sagittal plane kinematics were obtained using a high-speed video camera. Simultaneously, ground reaction forces and EMG of the lower limb muscles were recorded. Energy cost was calculated using steady-state oxygen uptake, respiratory ratio, and vertical distance of the body. Results In all conditions, energy cost correlated positively with total mechanical work of the knee joint (r = 0.636, P

from Sports Medicine via xlomafota13 on Inoreader http://bit.ly/2Ee0YUD
via IFTTT