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Pulling strength, muscular fatigue, and prediction of maximum endurance time for simulated pulling tasks

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  • Cannan Yi
  • Kai Way Li
  • Fan Tang
  • Huali Zuo
  • Liang Ma
  • Hong Hu

Abstract

Truck pulling is one of the common manual materials handling tasks which contribute to musculoskeletal disorders. The maximum endurance time (MET) for two-handed truck pulling tasks has been rarely discussed in the literature. The objectives of this study were to explore the development of muscular fatigue when performing two-handed pulling task and to establish models to predict the MET. A simulated pallet truck pulling experiment was conducted. Sixteen healthy adults including eight females and eight males participated. The participants pulled a handle simulating that of a pallet truck using two hands until they could not pull any longer under two postures. The forces applied for females and males were 139.65 N and 170.03 N, respectively. The maximum voluntary contractions (MVC) of the pulling strength both before and after the simulated pull were measured. After each trial, both the MET and subjective ratings of muscular fatigue on body segments were recorded. The results showed that posture significantly affected MVC of pull both before and after the trial. It was found that foot/shank of the front leg had higher subjective ratings of muscular fatigue than the other body segments. The MET equations employing both power and logarithmic functions were developed to predict the MET of the two-handed pulling tasks. Predictive models established in this study may be used to assess the MET for two-handed pulling tasks.

Suggested Citation

  • 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.
    • Handle: RePEc:plo:pone00:0207283
    DOI: 10.1371/journal.pone.0207283
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    References listed on IDEAS

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    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.
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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.

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