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Oxygen uptake measurements during competitive marathon running
Journal of Applied Physiology
|May 1, 1976
Summary
This study tracked oxygen uptake in marathon runners, finding their energy expenditure remained high throughout the race. Runners showed decreased oxygen consumption (Vo2 max) as the marathon progressed, even at similar speeds and slopes.
Area of Science:
- Exercise Physiology
- Sports Science
- Human Performance
Background:
- Marathon running demands significant physiological effort.
- Previous research estimated high energy expenditures during marathons.
Purpose of the Study:
- To measure oxygen uptake and running speeds in marathon runners.
- To analyze energy expenditure relative to maximal oxygen uptake (Vo2 max) during a competitive marathon.
Main Methods:
- Oxygen uptake and running speeds were recorded every 3 miles.
- Average terrain slopes were also measured.
- Energy expenditure was assessed in relation to Vo2 max.
Main Results:
- Runners' energy expenditures ranged from 68% to 100% of Vo2 max.
- Both runners showed a decrease in Vo2 as the race progressed.
- At 23.4 miles, one runner's oxygen uptake reached his Vo2 max (4.54 l/min).
Conclusions:
- Marathon running requires sustained high energy expenditure near maximal capacity.
- Physiological capacity, specifically Vo2, appears to decline during prolonged endurance events.
- Individual physiological limits are reached during extreme endurance events.