Abstract
To explore the effects of exercise on plasma atrial natriuretic peptide (ANP) concentrations, eight normotensive volunteers performed maximal treadmill exercise in sodium replete and deplete states. Baseline immunoreactive plasma ANP concentrations were significantly lower during sodium depletion. During exercise plasma ANP rose in all subjects on both occasions. Plasma peptide responses were attenuated by sodium depletion with peak exercise levels only double baseline values, in contrast to the threefold increase in ANP concentrations observed when subjects were sodium replete. Plasma renin and aldosterone concentrations also rose with exercise. In contrast to changes in plasma ANP, the responses of both were enhanced by sodium depletion.
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