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The Acute Effect of Exercise on Energy Intake in Overweight Women

Unick, Jessica Lynn (2009) The Acute Effect of Exercise on Energy Intake in Overweight Women. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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The role of exercise on short-term appetite regulation is not known. Furthermore mechanisms mediating this relationship need to be established. Purpose: The purpose of this study was to examine how a single bout of exercise influenced energy intake, subjective feelings of hunger, GLP-1 and acylated ghrelin concentrations compared to an exercise condition. Methods: A total of 19 overweight/obese women (BMI: 32.5 +/- 4.3 kg/m2; age 28.5 +/- 8.3 years) underwent two experimental testing sessions (exercise and rest) which were separated by at least 2 days. For the exercise session, subjects walked on a treadmill at a moderate intensity (70-75% of age-predicted maximal heart rate) until an energy expenditure of 3.0 kcals/kg of body weight was achieved. During the resting condition, subjects rested quietly for a similar length of time. Blood was drawn prior to exercise/rest, immediately post-exercise/rest, 30-minutes post, 60-minutes post, and 120-minutes post-exercise/rest and was analyzed for acylated ghrelin and GLP-1 concentrations. Subjective feelings of hunger were measured using a Likert scale prior to each blood draw. From 1-2 hours post-exercise subjects were provided ad-libitum access to a buffet-style meal and energy intake was calculated based upon food intake during this period. Results: There was no difference in energy intake between conditions (exercise: 551.5 +/- 245.1 vs. rest: 548.7 +/- 286.9 kcals). However, relative energy intake, taking into account the energy cost of exercise, was significantly lower in the exercise condition (197.8 +/- 256.5 kcals) compared to the resting condition (504.3 +/- 290.1 kcals; p<0.001). Exercise did not significantly alter acylated ghrelin, GLP-1, or subjective feelings of hunger from pre-testing to post-testing, nor were differences observed between conditions across the entire experimental testing session (p>0.05). Conclusion: Exercise does not appear to acutely influence energy intake in an overweight/obese population, thus making it a valuable component for managing body weight. Future studies should explore potential physiological or psychological mechanisms to explain why energy intake is not increased following a bout of moderate-intensity exercise in this population.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Unick, Jessica
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairJakicic, Johnjjakicic@pitt.eduJJAKICIC
Committee MemberOtto, Amyayotto@pitt.eduAYOTTO
Committee MemberGoodpaster, Bretbgood@pitt.eduBGOOD
Committee MemberHelsel, Dianedih1@pitt.eduDIH1
Date: 16 December 2009
Date Type: Completion
Defense Date: 12 August 2009
Approval Date: 16 December 2009
Submission Date: 3 September 2009
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: School of Education > Health, Physical, Recreational Education
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: appetite regulation; weight loss; food intake; obesity
Other ID:, etd-09032009-112245
Date Deposited: 10 Nov 2011 20:01
Last Modified: 15 Nov 2016 13:50


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