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c. f. healy c. mcmorrow† c. o'herlihy ‡ p. r. o'connell & j. f. x. jones † 《Neurogastroenterology and motility》2008,20(6):719-724
Abstract Oxidative stress is associated with skeletal muscle fatigue. This study tests the hypotheses that N -acetylcysteine (NAC) reduces fatigue and accelerates recovery of the rat external anal sphincter (EAS). Fifteen female Wistar rats were killed humanely. The EAS was mounted as a ring preparation and electrically stimulated with 50 Hz trains of 200 ms in duration every 4 s for three and a half minutes. Three groups were analysed: a control group ( n = 5), a group pretreated with NAC (10−4 mol L−1 ; n = 5) and a group pretreated with NAC (10−3 mol L−1 ; n = 5). A novel fatigue index was formulated and was compared to a conventional method of expressing fatigue. There was no significant difference at concentrations of NAC (10−4 mol L−1 ; P > 0.05). At high concentrations of NAC (10−3 mol L−1 ) there was a significant depression in peak twitch amplitude before fatigue ( P = 0.04). N -Acetylcysteine in both concentrations used, did not alter fatigue or recovery of the rat EAS. There was a significant positive correlation between the two methods of expressing fatigue but the conventional method produced a higher fatigue index (22.4% on average). N -Acetylcysteine does not ameliorate fatigue or accelerate recovery of the EAS and may not be a useful medical therapy for faecal incontinence. 相似文献
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