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Effect of Ambient Oxygen Content, Safety Shoe Type, and Lifting Frequency on Subject’s MAWL and Physiological Responses

Author

Listed:
  • Atef M. Ghaleb

    (Department of Industrial Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia)

  • Mohamed Z. Ramadan

    (Department of Industrial Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia)

  • Ahmed Badwelan

    (Department of Industrial Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia)

  • Khalid Saad Aljaloud

    (Department of Exercise Physiology, College of Sport Sciences & Physical Activity, King Saud University, Riyadh 11451, Saudi Arabia)

Abstract

Objective: The purpose of this study was to evaluate the lifting capabilities of individuals in hypoxia when they wear different types of safety shoes and to investigate the behavior of the physiological responses induced by the lifting process associated with those variables. Methods: An experimental design was used, based on two sessions. The first was training and acclimatization session, then an experimental lifting phase. A total of ten male students of King Saud University were recruited in the study. A four-way repeated measures design, with four independent variables and six dependent variables, was used in this research. The independent variables that were studied in the experimental lifting phase were: ambient oxygen content (15%, 18%, and 21%), safety shoes type (light-duty, medium-duty, and heavy-duty), lifting frequency (1 and 4 lifts/min), and replication (first and second trials). The dependent variables were also: maximum acceptable weights lifting using the psychophysical technique, heart rate (HR), electromyography (EMG) of (biceps brachii, trapezius, anterior deltoid, and erector spinae), safety shoes discomfort rating, rating of perceived exertion, and ambient oxygen discomfort rating. Results: The maximum acceptable weights lifting that were selected by participants at lower levels of the independent variables (ambient oxygen content 21%, lifting frequency 1 lift/min, and first replication) were significantly higher than at high levels of the independent variables (ambient oxygen content 15%, lifting frequency 4 lift/min, and second replication). Several interaction effects were also significant. Conclusions: It provides evidence that the ambient oxygen content increases the intensity of workload in lifting tasks. It showed that oxygen content affects the psychophysical selection of maximum acceptable weights lifting and the physiological responses represented in muscular activities and heart rate. It suggests that ambient oxygen content must be considered along with the type of safety shoes worn when the lifting task at altitudes occurs.

Suggested Citation

  • Atef M. Ghaleb & Mohamed Z. Ramadan & Ahmed Badwelan & Khalid Saad Aljaloud, 2019. "Effect of Ambient Oxygen Content, Safety Shoe Type, and Lifting Frequency on Subject’s MAWL and Physiological Responses," IJERPH, MDPI, vol. 16(21), pages 1-18, October.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:21:p:4172-:d:281392
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    References listed on IDEAS

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    1. Arcury, T.A. & O'Hara, H. & Grzywacz, J.G. & Isom, S. & Chen, H. & Quandt, S.A., 2012. "Work safety climate, musculoskeletal discomfort, working while injured, and depression among migrant farmworkers in North Carolina," American Journal of Public Health, American Public Health Association, vol. 102(S2), pages 272-278.
    2. Mohammad Didar Hossain & Afzal Aftab & Mahmudul Hassan Al Imam & Ilias Mahmud & Imran Ahmed Chowdhury & Razin Iqbal Kabir & Malabika Sarker, 2018. "Prevalence of work related musculoskeletal disorders (WMSDs) and ergonomic risk assessment among readymade garment workers of Bangladesh: A cross sectional study," PLOS ONE, Public Library of Science, vol. 13(7), pages 1-18, July.
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    1. 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.

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