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J Appl Physiol 16: 971-976, 1961;
8750-7587/61 $5.00
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Oxygen uptake during the first minutes of heavy muscular exercise

Per-Olof Åstrand 1 and Bengt Saltin 1

1 Department of Physiology, Kungliga Gymnastiska Centralinstitutet, Stockholm, Sweden

Oxygen uptake, heart rate, pulmonary ventilation, and blood lactic acid were studied in five subjects performing maximal work on a bicycle ergometer. After a 10-min warming up period work loads were varied so that exhaustion terminated exercise after about 2–8 min. Peak oxygen uptake and heart rate were practically identical (sd 3.1% and 3 beats/minute, respectively) in the experiments. The heavier the work was and the shorter the work time the higher became the pulmonary ventilation. There was a more rapid increase in the functions studied when the heaviest work loads were performed. It is concluded that aerobic capacity can be measured in a work test of from a few up to about 8 min duration, severity of work determining the actual work time necessary. Duration of work in studies of circulation and respiration during submaximal work should exceed 5 min.

Submitted on June 23, 1961




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