EFFECTS OF PRIOR EXERCISE OR AMMONIUM CHLORIDE INGESTION ON MUSCULAR STRENGTH AND ENDURANCE

Authors
  1. Jacobs, I.
  2. Hermiston, A.J.
  3. Symons, J.D.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The purpose of this investigation was to determine if the means of altering pH of blood affected the extent of muscular fatigue. Thus the effects of drug-induced acidosis and exercise-induced acidosis were compared in order to test the hypothesis that exercise-induced acidosis would impair subsequent muscular performance to a greater extent than would chemical-induced acidosis. In 8 male subjects acidosis was induced by ingestion of 0.3 g/kg ammonium chloride (AC) for one trial, by upper body exercise (UBE) for another trial, while a fourth trial occurred after placebo (PL) treatment. After treatment the subjects completed a performance test (PT) which was 50 maximal bilateral isokinetic knee extensions. Whole blood was sampled and analyzed for pH before and after the PT. pH was decreased significantly and to a similar extent by both AC and UBE compared to PL. The values for peak torque and total worked performed during the PT were similar for PL and AC, and were significantly greater than for UBE. Sixe of the eight subjects also performed a fourth trial after combined AC and UBE treatments which caused a greater decrease in pH compared to all the other trials, but there was no greater performance impairment than that caused by UBE alone. Therefore, a decrease in pH per se did not attenuate PT performance. The results dissociate the extent of the impairment from the magnitude of the disruption in blood pH.
Report Number
DCIEM-RP-92-30 — Reprint; Research Report
Date of publication
01 Jul 1992
Number of Pages
6
Reprinted from
Med Sci Sports Exerc, vol 25, no 7, 1993 p 809-814
DSTKIM No
93-04287
CANDIS No
133938
Format(s):
Hardcopy;Originator's fiche received by DSIS

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