On estimation of pedaling torque by accelerometer attached to the leg part

Abstract

Optimizing pedaling torque waveform is one of effective approaches to high pedaling efficiency. Usually, the pedaling torque waveform is optimized inefficiently by trial and error based on the pedaling torque measured by a power meter. An appropriate theoretical model for estimation of the pedaling torque is expected to drastically improve the inefficient optimization process. In this study, we derived a theoretical equation for the pedaling torque based on the link-segment model of the lower body and the crank. The pedaling torque can be estimated by the derived equation with the trajectories of motion of the legs and the crank during pedaling measured by accelerometers. The estimated pedaling torque was compared with that obtained by the power meter. As a result, both the pedaling torques were consistent to some extent with each other. However, a large error remained at the peak value even if the external force associated with the pedaling force was considered. Thus, it is necessary to improve the estimation accuracy by optimizing the measurement method of the trajectories of motion with the accelerometers.