Študija primera : vpliv dolžine gonilke na biomehanske lastnosti kolesarjenja

slovenian

2022

volume 70, issue 1/2

Univerza v Ljubljani, Fakulteta za šport

To date, studies were primary focused on crank length impact on metabolic efficiency and kinematics of cycling with emphasis to joint range of motion, crank angular velocity and crank power. The purpose of this study was to examine the effects of crank arm length on cycling biomechanics at different workloads. Cycling efficiency and joint forces and torques of the lower extremity were monitored as well as potential biomechanical characteristics of cycling to the occurrence of overuse injuries in the lower extremity joints. Two well trained cyclists volunteered for the study. They cycled on an indoor ergometer twice for one minute at 175 and 225 W. Sessions were performed using crank arm length of 160 mm and 172 mm. The net joint forces, joint power, crank torque, resultant and effective force on the pedals, index of effectiveness, pedal forces, patellofemoral force, tibiofemoral force and knee angle were calculated. Results showed that shorter crank reduce loads of internal and external knee torque in transverse plain as well as varus and valgus torque in sagittal plain. Also, hip shear forces and patellofemoral forces were reduced by 10 % using shorter crank. Cycling effectiveness wasn’t affected by crank arm length.

06.11.2024