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- W2129690717 endingPage "1918" @default.
- W2129690717 startingPage "1913" @default.
- W2129690717 abstract "Elevated blood levels of beta-endorphin have been associated with high-intensity exertion, but the stimulus for beta-endorphin release is unknown. Some studies of exercise have associated beta-endorphin release with increased exertion levels, but other evidence suggests that acidosis may stimulate the release of beta-endorphin. This study examines acidosis as a possible stimulus for beta-endorphin release by examining the effects of arterial blood gases, whole blood lactate, and respiratory changes on beta-endorphin levels and by examining the effects of buffering during exercise on these levels. Initially, seven healthy adult males were evaluated during incremental exercise. During incremental exertion, indicators of acidosis correlated with endorphin levels: pH (r = -0.94), PCO2 (r = -0.85), HCO3- (r = -0.88), base excess (r = -0.94), and lactate (r = 0.89). A multivariate model showed that beta-endorphin levels were predicted best by the change in base excess. A time course analysis showed that beta-endorphin responses peaked postexercise and paralleled blood acid levels. Subsequently, subjects were compared after alkali loading and placebo during constant-intensity exercise at 85% of maximal exertion to determine whether acidosis is necessary for endorphin release. Treatment with a buffer, which effectively maintained pH above 7.40, significantly suppressed endorphin release (F = 3.07; P < 0.0001). The results of this study indicate that acidosis rather than any other physiological change associated with high-intensity exertion is the primary stimulus for beta-endorphin release." @default.
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- W2129690717 date "1994-10-01" @default.
- W2129690717 modified "2023-09-27" @default.
- W2129690717 title "Acidosis stimulates beta-endorphin release during exercise" @default.
- W2129690717 doi "https://doi.org/10.1152/jappl.1994.77.4.1913" @default.
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