The Effects of an Acute Bout of Strenuous Aerobic Exercise on Plasma, Erythrocyte, Urinary and Dietary Values for Selected Trace Minerals
TEXAS WOMAN'S UNIV DENTON
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Nineteen competitive cyclists participated in a week-long study to determine if prolonged, intense aerobic exercise produced a significant change in plasma, erythrocyte, andor urine values for zincZn and copperCu. Subjects pedaled a cycle ergometer for 1 hour at 80 anaerobic threshold, after which, resistance was incrementally increased by 20 wattsminute until voluntary exhaustion. Six blood collections were drawn pre-exercise, post-exercise and 2-, 24-, 72-, and 120-hours post-exercise, respectively. Five 24-hour urine collections were taken one day pre-exercise, the exercise day, and 1-, 2-, and 4-days post-exercise, respectively. Results were significant p0.05 for plasma-Zn, erythrocyte-Zn, plasma-Cu, and erythrocyte-Cu changes, respectively, over the study period post-exercise plasma-Zn increased over all other blood draws pre-exercise erythrocyte-Zn and erythrocyte-Cu higher than each subsequent blood draw and post-exercise plasma-Cu higher than prior or subsequent blood draws, respectively. Results suggest that Zn and Cu status cannot be maintained in plasma and erythrocytes when athletes consume self-selected unsupplemented diets.
- Anatomy and Physiology
- Stress Physiology