The Effect of Moderate Physical Activity on Resting Fat Oxidation
Copay, Anne Ghislaine
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Permalink
https://hdl.handle.net/2142/86361
Description
Title
The Effect of Moderate Physical Activity on Resting Fat Oxidation
Author(s)
Copay, Anne Ghislaine
Issue Date
2002
Doctoral Committee Chair(s)
Richard A. Washburn
Department of Study
Kinesiology and Community Health
Discipline
Kinesiology and Community Health
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Animal Physiology
Language
eng
Abstract
The purpose of the study was to investigate the effect of moderate physical activity (following the CDC/ACSM recommendation) on the resting level of fat oxidation. It was hypothesized that a 30-minute treadmill walk at 50% VO 2peak performed in late afternoon would not increase fat oxidation the following morning (12 hours after the end of the treadmill walk). It was also hypothesized that a 60-minute treadmill walk at 50% VO2peak performed in the late afternoon will increase fat oxidation the following morning (12 hours after the end of the treadmill walk). Twenty healthy sedentary women (age 30--47) walked for 30 and 60 minutes on a treadmill at about 50% VO2peak. The respiratory quotient (RQ) was measured first thing in the morning on three occasions: following a day without physical activity (baseline), following a day with a 30-minute walk, and following a day with a 60-minute walk. RQ significantly decreased from .81 at baseline to .79 after the 30-minute walk and to .78 after the 60-minute walk. The RQ difference between the 30- and 60-minute walks was not significant. In 7 participants, RQ did not decrease after the walks; those non-responders had a lower baseline RQ than the other participants. Of the study variables, only caloric intake was positively and significantly associated with RQ. The results indicate that a 30-minute bout of moderate activity is sufficient to significantly increase resting fat oxidation and supports the recommendation of the CDC/ACSM.
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