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Open AccessArticle

Strength Decrease, Perceived Physical Exertion and Endurance Time for Backpacking Tasks

1
Department of Industrial Management, Chung Hua University, Hsinchu 30012, Taiwan
2
Ph.D. Program of Technology Management, Chung Hua University, Hsin-Chu 30012, Taiwan
3
Department of Information Management, Hsing Wu University of Science & Technology, New Taipei 24452, Taiwan
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(7), 1296; https://doi.org/10.3390/ijerph16071296
Received: 1 March 2019 / Revised: 9 April 2019 / Accepted: 9 April 2019 / Published: 11 April 2019
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PDF [2373 KB, uploaded 11 April 2019]
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Abstract

Manual material handling (MMH) tasks create a burden for workers which could result in musculoskeletal injuries. Assessments of the decrease of muscular strength and the maximum endurance time (MET) for MMH tasks are essential in studying the ergonomic risk of MMH tasks. A backpacking experiment was conducted for measuring the MET for MMH tasks. Human participants carried a load on their back and walked on a treadmill under various load, walking speed, and ramp angle conditions until they coud no longer do so. It was found that the participants were able to walk for approximately 15 min to two hours before they needed to have a pause. Their back and leg strengths declined moderately due to performing the tasks. These tasks resulted in an increase in heart rate and elevated perceived physical exertion. The rating of perceived exertion (RPE)/heart rate ratio in our backpacking tasks was 31% higher than that in the literature, implying the calibration of the RPE may be required for such tasks. A MET model incorporating the fMVC_back, body weight, walking speed, and ramp angle was established. This model may be used to determine the work/rest allowance for backpacking tasks under conditions similar to this study. View Full-Text
Keywords: manual material handling; manual operation; muscular fatigue; maximum endurance time manual material handling; manual operation; muscular fatigue; maximum endurance time
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Li, K.W.; Chu, J.C.; Chen, C.C. Strength Decrease, Perceived Physical Exertion and Endurance Time for Backpacking Tasks. Int. J. Environ. Res. Public Health 2019, 16, 1296.

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