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J Appl Physiol 79: 539-546, 1995;
8750-7587/95 $5.00
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Journal of Applied Physiology, Vol 79, Issue 2 539-546, Copyright © 1995 by American Physiological Society

ARTICLES

Pattern of recovery from diaphragmatic fatigue over 24 hours

F. Laghi, N. D'Alfonso and M. J. Tobin
Division of Pulmonary and Critical Care Medicine, Edward Hines, Jr. Veterans Affairs Hospital, Hines, Illinois 60141, USA.

The rate of recovery from diaphragmatic fatigue beyond 1 h is unknown. To investigate this question, we studied 12 healthy subjects and measured transdiaphragmatic twitch pressure (Pditw) using magnetic stimulation of the phrenic nerves. Measurements were obtained at baseline and after a fatigue protocol consisting of inspiratory resistive loading in which the subjects generated 60% of maximal transdiaphragmatic pressure until task failure. At baseline, Pditw was 38.9 +/- 1.1 (SE) cmH2O and fell to 25.1 +/- 0.6 cmH2O 10 min after the conclusion of the fatigue protocol (P < 0.01). Pditw increased to 27.6 +/- 0.9, 31.6 +/- 1.1, and 32.7 +/- 1.2 cmH2O 1, 8 and 24 h, respectively, after the conclusion of the fatigue protocol; the 24-h value was significantly lower than baseline (P < 0.01). The nadir in Pditw after the protocol was delayed by 10 min. In separate experiments, we showed that this delay was probably due to the development of twitch potentiation as a result of forceful diaphragmatic contractions during the fatigue protocol. In conclusion, induction of diaphragmatic fatigue with this experimental protocol produced a marked decrease in diaphragmatic contractility that persisted for at least 24 h.


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