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Isometric Arm Strength and Subjective Rating of Upper Limb Fatigue in Two-Handed Carrying Tasks

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  • Kai Way Li
  • Wen-Sheng Chiu

Abstract

Sustained carrying could result in muscular fatigue of the upper limb. Ten male and ten female subjects were recruited for measurements of isometric arm strength before and during carrying a load for a period of 4 minutes. Two levels of load of carrying were tested for each of the male and female subjects. Exponential function based predictive equations for the isometric arm strength were established. The mean absolute deviations of these models in predicting the isometric arm strength were in the range of 3.24 to 17.34 N. Regression analyses between the subjective ratings of upper limb fatigue and force change index (FCI) for the carrying were also performed. The results indicated that the subjective rating of muscular fatigue may be estimated by multiplying the FCI with a constant. The FCI may, therefore, be adopted as an index to assess muscular fatigue for two-handed carrying tasks.

Suggested Citation

  • 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.
    • Handle: RePEc:plo:pone00:0119550
    DOI: 10.1371/journal.pone.0119550
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    Cited by:

    1. 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.
    2. 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.
    3. Fares F. Alferdaws & Mohamed Z. Ramadan, 2020. "Effects of Lifting Method, Safety Shoe Type, and Lifting Frequency on Maximum Acceptable Weight of Lift, Physiological Responses, and Safety Shoes Discomfort Rating," IJERPH, MDPI, vol. 17(9), pages 1-19, April.
    4. Cannan Yi & Kai Way Li & Fan Tang & Huali Zuo & Liang Ma & Hong Hu, 2018. "Pulling strength, muscular fatigue, and prediction of maximum endurance time for simulated pulling tasks," PLOS ONE, Public Library of Science, vol. 13(11), pages 1-12, November.

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