6 soldiers were allowed to determine their own pedaling rates and rest periods while completing a certain amount of pedal revolutions on a bicycle ergometer. Inspired oxygen concentration (21% O2, 12% O2), pedal resistance (2 kg, 3 kg) and motivational contingency (extra pedaling required for slower performance) were varied. Decreasing oxygen concentration and increasing pedal resistance had similar effects on some aspects of self-pacing behavior and different effects on others. The motivational contingency did not significantly affect performance.
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