Cumulative local muscle fatigue may lead to potential musculoskeletal disorder (MSD) risks {\color{red}, and subject-specific muscle fatigability needs to be considered to reduce potential MSD risks.} This study was conducted to determine local muscle fatigue rate at shoulder joint level based on an exponential function derived from a muscle fatigue model. Forty male subjects participated in a fatiguing operation under a static posture with a range of relative force levels (14% - 33%). Remaining maximum muscle strengths were measured after different fatiguing sessions. The time course of strength decline was fitted to the exponential function. Subject-specific fatigue rates of shoulder joint moment strength were determined. Good correspondence (R2>0.8) was found in the regression of the majority (35 out of 40 subjects). Substantial inter-individual variability in fatigue rate was found and discussed.
@article{arxiv.1402.1713,
title = {Determination of subject-specific muscle fatigue rates under static fatiguing operations},
author = {Liang Ma and Wei Zhang and Bo Hu and Damien Chablat and Fouad Bennis and François Guillaume},
journal= {arXiv preprint arXiv:1402.1713},
year = {2014}
}