Date of Award

8-2005

Degree Name

Master of Arts

Department

Human Performance and Health Education

Department

Health, Physical Education & Recreation

First Advisor

Dr. Timothy J. Michael

Second Advisor

Dr. Christopher Cheatham

Third Advisor

Dr. Mark Ricard

Access Setting

Masters Thesis-Open Access

Abstract

The purpose of this study was to investigate and describe the influence of pre-carbohydrate feedings prior to exercise to fatigue. Five individuals performed a peak bike test and four experimental trials, separated by 7 days. Upon arrival, subjects ingested 1g of carbohydrates (CHO) for every kilogram of body weight (BW) of a high glycemic index meal (HGI) or a low glycemic index meal (LGI) prior to exercise to fatigue. Subjects waited 30- or 60-minutes following each test meal, totaling four experimental trials. The exercise regiment was consistent following each meal; 90 minutes cycling at 70% peak oxygen consumption (VO2peak) followed by an all-out sprint until fatigue. The subjects for the 60 minute trial had blood draws taken at -30-, 0-, +10-, +30-, +60-, +90-min, and fatigue. One less blood sample was taken from the subjects waiting 30 minutes (0-, +10-, +30-, +60-, +90-min, and fatigue). Heart rate was taken at rest, every 10 minutes of exercise, and at fatigue. VO2 and respiratory exchange ratio (RER) measurements were taken for the first 30 minutes of exercise and at 10 minutes surrounding each blood draw. No significant statistical differences were found for any of the variables between trials, including blood glucose, blood lactate, ratings of perceived exertion (RPE), RER, VO2, and performance time. In conclusion, the pre-exercise meals used in this study consumed prior to exercise (-30-, -60-min) to fatigue does not increase time to fatigue.

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