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The physiological costs of box lifting.

M Hake, E D Michael

Journal of Human Ergology

|December 1, 1977

Summary

This study on box lifting found that physiological responses like oxygen uptake and ventilation stabilize quickly. However, heart rate stabilization varied with box weight, and subjective difficulty ratings didn't consistently match physiological exertion.

Area of Science:

Occupational Health
Human Physiology
Ergonomics

Background:

Understanding physiological responses to manual handling tasks is crucial for workplace safety.
Previous research has explored metabolic and cardiovascular responses to lifting, but comprehensive analysis across varying loads is needed.

Purpose of the Study:

To investigate the physiological responses (oxygen uptake, ventilation, heart rate) and subjective difficulty ratings during prolonged box lifting at different weights.
To determine the relationships between work load, physiological parameters, and perceived exertion.

Main Methods:

Thirteen male subjects performed 20-minute box lifting tasks at three distinct weights.
Continuous monitoring of ventilation, oxygen uptake, and heart rate was conducted.

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Subjects provided subjective ratings of perceived exertion.

Main Results:

Oxygen uptake and ventilation reached a steady state within 4 minutes.
Heart rate reached steady state for lighter loads but continued to increase with the heaviest load.
Curvilinear relationships were observed between work load and oxygen uptake/heart rate, and between oxygen uptake and heart rate.
Linear relationships were found between work load and ventilation, and between oxygen uptake and ventilation.
Subjective ratings underestimated exertion for heavier loads.

Conclusions:

Physiological responses to prolonged lifting vary with load intensity, particularly heart rate.
The relationship between physiological measures and perceived exertion is not linear, especially under heavier loads.
Mechanical efficiency during lifting ranged from 4.4% to 6.2%.