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J Appl Physiol 64: 1397-1404, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 64, Issue 4 1397-1404, Copyright © 1988 by American Physiological Society

ARTICLES

Pressure-time product, work rate, and endurance during resistive breathing in humans

D. S. Dodd, S. Kelly, P. W. Collett and L. A. Engel
Thoracic Medicine Unit, Westmead Hospital, New South Wales, Australia.

We examined the effect of increasing work rate, without a corresponding increase in the pressure-time product, on energy cost and inspiratory muscle endurance (Tlim) in five normal subjects during inspiratory resistive breathing. Tidal volume, mean inspiratory mouth pressure, duty cycle, and hence the pressure-time product were kept constant, whereas work rate was varied by changing the frequency of breathing. There was a linear decrease in Tlim of -2.1 +/- 0.5 s.J-1.min-1 (r = 0.87 +/- 0.06) with increasing work rate. The data satisfied a model of energy balance during fatiguing runs (Monod and Scherrer. Ergonomics 8: 329-337, 1965) and were consistent with the hypothesis that the rate of energy supply, or respiratory muscle blood flow, is fixed when the pressure-time product is constant. Our results indicate that during inspiratory resistive breathing against fatiguing loads, work rate determines endurance independently of the pressure-time product. On the basis of the model, our results lead to estimates of respiratory muscle blood flow and available energy stores under the conditions of our experiment.


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