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J Appl Physiol 68: 2107-2113, 1990;
8750-7587/90 $5.00
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Journal of Applied Physiology, Vol 68, Issue 5 2107-2113, Copyright © 1990 by American Physiological Society

ARTICLES

Effect of N-acetylcysteine on diaphragm fatigue

C. Shindoh, A. DiMarco, A. Thomas, P. Manubay and G. Supinski
Pulmonary Division, MetroHealth Medical Center, Cleveland, Ohio.

It has recently been postulated that diaphragm fatigue may be due, at least in part, to a form of low-grade injury to subcellular organelles. Moreover, several studies have shown that thiol-containing compounds can protect cardiac and striated skeletal muscle organelles from the deleterious effects of a number of physiological stresses. The purpose of the present study was to determine whether pretreatment with N-acetylcysteine (NAC), a thiol-containing compound, would attenuate the rate of development of diaphragmatic fatigue. Studies were performed with the use of an in situ rabbit diaphragm strip preparation that permitted direct and continuous measurement of diaphragm tension development. Diaphragm fatigue was induced by rhythmically stimulating strips to contract at 30/min (20-Hz trains) for 20 min. The diaphragm force-frequency relationship (10-, 20-, 50-, and 100-Hz stimuli) was assessed immediately before and after fatigue trials and then again 20 min into the period of recovery. Half the animals were treated with intravenous NAC before fatigue, whereas the remaining animals were given intravenous saline. The rate of development of fatigue was markedly greater in saline-treated control than in NAC-treated animals, with reductions in tension of 55 +/- 3 and 34 +/- 3%, respectively, in these two groups of animals over 20 min (P less than 0.001). Although rhythmic stimulation resulted in a downward shift in the force-frequency relationship in both NAC- and saline-treated animals, the magnitude of this shift was substantially greater in saline-treated animals (P less than 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)


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