Running Endurance in 27-hour Fasted Humans

<p>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-1in 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</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Nutrition

Year

1986

Author dc:creator

• Carlson, Kristin A.

Contributors dc:contributor

• David C. Nieman
• U.D. Regisler
• James W. Blankenship
• Kristian Lindsted
• Murray E. Brandstater

• Exercise Physiology
• Nutrition
• Running; Fasting

Statement dc: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.

Language dc:language

English

Repository record dc:identifier

https://scholarsrepository.llu.edu/etd/624

OAI identifier oai:identifier

oai:scholarsrepository.llu.edu:etd-1696