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Optimal rate of work for mountaineers
Summary
Highlanders carrying loads at high altitude showed increased oxygen consumption, nearing maximal aerobic capacity with heavy loads. Optimal work rates for daily tasks are suggested to be around 4,000 kg.m.min-1 to prevent exhaustion.
Area of Science:
- Physiology
- High-altitude studies
- Work capacity assessment
Background:
- High-altitude environments pose unique physiological challenges.
- Carrying loads significantly impacts energy expenditure and work capacity.
- Understanding optimal work rates is crucial for highlanders and porters.
Purpose of the Study:
- To investigate the physiological responses of young male highlanders to varying loads and speeds at high altitude.
- To determine the relationship between work rate and energy expenditure.
- To identify optimal work conditions for highlanders.
Main Methods:
- Seven young male highlanders participated in the study.
- Physiological responses were recorded while carrying loads (0-55 kg) on snow at different speeds.
- Work rates were calculated based on gross weight and walking speed.
Main Results:
- Energy expenditure showed a rectilinear relationship with the rate of work.
- Oxygen consumption approached maximal aerobic capacity with a 55-kg load.
- The proportion of increased oxygen consumption per unit of work was relatively constant.
Conclusions:
- High energy output at high altitude can lead to rapid exhaustion.
- For daily operations, work should not exceed 30-40% of maximal work capacity.
- An optimal work rate of approximately 4,000 kg.m.min-1 is suggested for highlanders.