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

Kai Way Li1, Jenn Chun Chu2, Ching Chung Chen3

  • 1Department of Industrial Management, Chung Hua University, Hsinchu 30012, Taiwan. kai@chu.edu.tw.

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Summary
This summary is machine-generated.

Manual material handling tasks can cause musculoskeletal injuries. This study developed a model to determine work/rest allowances for backpacking tasks, considering load, speed, and incline, to mitigate risks.

Keywords:
manual material handlingmanual operationmaximum endurance timemuscular fatigue

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Area of Science:

  • Ergonomics and Occupational Health
  • Biomechanics
  • Human Factors Engineering

Background:

  • Manual material handling (MMH) poses risks for musculoskeletal injuries.
  • Assessing muscular strength decline and maximum endurance time (MET) is crucial for evaluating MMH ergonomic risks.

Purpose of the Study:

  • To measure the MET for MMH tasks using a backpacking experiment.
  • To establish a MET model for determining work/rest allowances in similar tasks.

Main Methods:

  • Human participants performed backpacking tasks on a treadmill with varying loads, walking speeds, and ramp angles.
  • Data collected included MET, muscular strength decline, heart rate, and perceived physical exertion (RPE).

Main Results:

  • Participants' MET ranged from 15 minutes to 2 hours.
  • Moderate declines in back and leg strength were observed.
  • Increased heart rate and elevated RPE were noted, with an RPE/heart rate ratio 31% higher than literature values.

Conclusions:

  • A MET model integrating load, body weight, walking speed, and ramp angle was developed.
  • This model can inform work/rest allowance calculations for comparable backpacking scenarios.
  • Calibration of RPE may be necessary for MMH tasks like backpacking.