Date of Award

6-1-1999

Degree Type

Restricted Access Thesis

Degree Name

Master of Science

Field of Study

Integrative Physiology

Department

Graduate School of Biomedical Sciences

First Advisor

Peter B. Raven

Second Advisor

Michael Smith

Third Advisor

Xiangrong Shi

Abstract

Williams, Michael B., Endurox R4® & Gatorade®: Effects of Recovery Drinks After Prolonged Glycogen-Depletion Exercise. Master of Science (Biomedical Sciences, Integrative Physiology), June, 1999, 73 pp., 2 tables, 18 figures, references. Purpose: Eight high-fit (bicycle Vo2max=62.4 ± 1.10 ml·kg-1·min-1) male cyclists, aged 28.4±1.65 yrs, performed a two-hour endurance bicycle exercise to achieve depletion of skeletal muscle and liver glycogen. During recovery, Endurox R4 Recovery Drink®, or Gatorade®, was ingested to investigate their relative restorative capacities to enable further exercise. Methods: Each subject performed two days of testing: one for each drink presented in random order. On each testing day, the twelve-hour fasted subject performed a two-hour cycling exercise bout at 75% VO2max followed by one to three five-minute sprints at 85% VO2max. At the end of the exercise blood glucose concentrations were 3.98±0.138 mmol/L. A four hour recovery period ensued in which the subject was given 24-ounces of the recovery drink. A performance test at 85% VO2max to exhaustion was then conducted. Ventilatory responses were collected breath-to-breath, while venous blood samples were measured for oxidation products, glucose and insulin concentrations. Results: The recovery phase showed significant increases in both plasma glucose and serum insulin following Endurox R4 Recovery Drink® ingestion as compared to Gatorade®. There was a significant increase in time to exhaustion (+55%) following Endurox R4 Recovery Drink® during the performance ride compared to Gatorade®. Final oxidation products following Endurox R4 Recovery Drink® ingestion were significantly decreased as compared to Gatorade® ingestion, in that Thiobarbituric Acid Reactive Substrates (T-BARS) were significantly decreased. Conclusions: These data indicate that the Endurox R4 Recovery Drink®, when compared to Gatorade®, significantly enhanced recovery from glycogen-depleting exercise. In addition, Endurox R4 Recovery® Drink decreased the formation of final oxidation products, when compared to Gatorade®.

Comments

Williams, Michael B., Endurox R4® & Gatorade®: Effects of Recovery Drinks After Prolonged Glycogen-Depletion Exercise. Master of Science (Biomedical Sciences, Integrative Physiology), June, 1999, 73 pp., 2 tables, 18 figures, references. W 4.5 W725E 1999

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