Abstract

Nine male marathon runners were exercised to exhaustion to determine the effects of a 27-hour fast on endurance performance. Each subject completed two exercise tests at 72% peak oxygen uptake (Vo2max), one following a 27-hour fast and one three hours after a pre-exercise meal, in random order. Fasting caused a 44.7±5.8% (±SE) decrease in endurance performance (p2(9.3±2.0%), heart rate (8.4±2.4%), rating of perceived exertion (RPE), and psychological fatigue, evident within the first 60 minutes of exercise. There was no difference in plasma glucose or epinephrine levels. Muscle glycogen degraded at the same rate (0.48±.15 vs 0.47±.28 u moles • g -1.min-1 in the non-fasted and fasted tests, respectively) despite lower respiratory exchange ratio (R) and elevated free fatty acid (FFA) levels. Lactate, insulin,. norepinephrine (NE), and 3,4-dihydroxyphenylacetic acid (dopac) were all increased in the fasted test (p

Department

Nutrition

School

Graduate School

First Advisor

David C. Nieman

Second Advisor

U.D. Regisler

Third Advisor

James W. Blankenship

Fourth Advisor

Kristian Lindsted

Fifth Advisor

Murray E. Brandstater

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1986

Date (Title Page)

12-1986

Language

English

Library of Congress/MESH Subject Headings

Running; Fasting

Type

Thesis

Page Count

iii; 32

Digital Format

PDF

Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Collection

Loma Linda University Electronic Theses and Dissertations

Collection Website

http://scholarsrepository.llu.edu/etd/

Repository

Loma Linda University. Del E. Webb Memorial Library. University Archives

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