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Subject‐specific hand grip fatigability indicator determined using parameter identification technique
Author(s) -
Liu Bin,
Ma Liang,
Zhang Wei,
Zhang Zhanwu
Publication year - 2019
Publication title -
human factors and ergonomics in manufacturing and service industries
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.408
H-Index - 39
eISSN - 1520-6564
pISSN - 1090-8471
DOI - 10.1002/hfm.20760
Subject(s) - grip strength , muscle fatigue , physical medicine and rehabilitation , hand strength , physical therapy , statistics , medicine , psychology , mathematics , electromyography
During hand grip operations, the fatigability of the local muscle determines the antifatigue capacity and influences the risk of injury of the workers. This study proposes a new hand grip subject‐specific fatigability indicator using a parameter identification technique from a physiologically based muscle fatigue model. Experimental measurements were conducted in a laboratorial fatiguing operation with a fixed external load (5 kg) under a static posture. Sixty participants (30 males and 30 females) participated in the experiment. Subject‐specific hand muscle fatigue rates ( k ) were identified by performing regressions of the muscle strength during time intervals using the muscle fatigue model. The majority (46/60) of the goodness of fit statistics ( R 2 ) was over 0.70, which indicates the validity of using the fatigue rate ( k ) as a hand grip fatigability indicator. Individual differences in the hand grip fatigue rate ( k ) were substantial, ranging from 0.14 to 2.57 min −1 with a coefficient of variation of 59.0%. The gender effect and body mass index did not exhibit significant influences on the hand grip muscle fatigue rates ( k ).