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

Author

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  • Kai Way Li

    (Department of Industrial Management, Chung Hua University, Hsinchu 30012, Taiwan)

  • Jenn Chun Chu

    (Ph.D. Program of Technology Management, Chung Hua University, Hsin-Chu 30012, Taiwan)

  • Ching Chung Chen

    (Department of Information Management, Hsing Wu University of Science & Technology, New Taipei 24452, Taiwan)

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 f MVC_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.

Suggested Citation

  • Kai Way Li & Jenn Chun Chu & Ching Chung Chen, 2019. "Strength Decrease, Perceived Physical Exertion and Endurance Time for Backpacking Tasks," IJERPH, MDPI, vol. 16(7), pages 1-13, April.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:7:p:1296-:d:221796
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    References listed on IDEAS

    as
    1. Kai Way Li & Wen-Sheng Chiu, 2015. "Isometric Arm Strength and Subjective Rating of Upper Limb Fatigue in Two-Handed Carrying Tasks," PLOS ONE, Public Library of Science, vol. 10(3), pages 1-14, March.
    2. Aaron Joseph & Amy Wiley & Robin Orr & Benjamin Schram & J. Jay Dawes, 2018. "The Impact of Load Carriage on Measures of Power and Agility in Tactical Occupations: A Critical Review," IJERPH, MDPI, vol. 15(1), pages 1-16, January.
    3. Michelle Perrone & Robin Orr & Wayne Hing & Nikki Milne & Rodney Pope, 2018. "The Impact of Backpack Loads on School Children: A Critical Narrative Review," IJERPH, MDPI, vol. 15(11), pages 1-25, November.
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    Cited by:

    1. Cannan Yi & Huali Zuo & Caijun Zhao & Kai-Way Li & Hong Hu & Fan Tang & Tong Long, 2022. "Fatigue and Recovery of Muscles for Pulling Tasks," IJERPH, MDPI, vol. 19(22), pages 1-14, November.
    2. Paulina Tomal & Anna Fryzowicz & Elżbieta Skorupska & Lechosław B. Dworak, 2022. "Influence of School Backpack Load as a Variable Affecting Gait Kinematics among Seven-Year-Old Children," IJERPH, MDPI, vol. 19(7), pages 1-12, March.

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