Abstract
AbstractFrequent wrist‐twisting operations of hand tools results in wrist injuries, loss of control, localized discomfort and muscular fatigue. The aim was to investigate upper extremity strength in generic wrist‐twisting modes while using hand tools and forecasting the limits while in frequent or continuous operation. Hundred men were recruited (Group 1: 18‐39 years and Group 2: 40‐60 years). Upper extremity isometric muscular strength testing of the preferred hand during wrist‐twisting type of manual hand‐tool operations was carried out for 60 s. Forecasting of strength to generate predictions for future events (60 s) based on measured 60 s was carried out using Holt‐Winters time series model. Descriptive statistics was used for analysis. For prediction model evaluation, WEKA 3.8.2 was used. Anthropometric parameters of both groups were similar, having minimal effect on generated strength. The strength generated by Group 2 workers were slightly higher than their younger counterparts. The mean clockwise strength for both groups were recorded to be higher than the anticlockwise strength. Also, standing posture generated higher strength than in seated posture. During last 5 s of trial, participants could sustain only three‐fifth of strength generated in the first 5 s for anticlockwise trials. Whereas, for clockwise trial, the strength sustainability during the last 5 seconds was around three‐fourth of initial 5 seconds. Uniformly decreasing plateau of strength over time support clockwise torque application for increase efficiency, reduced fatigue, and musculoskeletal disorders. Strength data generated would assist in re‐engineering the design of tools at workplace and suggest functional limits of work.
Published Version
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