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Satiety, but not total PYY, Is increased with continuous and intermittent exercise

Holmstrup, M.E., Fairchild, T.J., Keslacy, S., Weinstock, R.S. and Kanaley, J.A. (2013) Satiety, but not total PYY, Is increased with continuous and intermittent exercise. Obesity, 21 (10). pp. 2014-2020.

Free to read: http://dx.doi.org/10.1002/oby.20335
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Abstract

Objective
This study determined the hormonal and subjective appetite responses to exercise (1-h continuous versus intermittent exercise throughout the day) in obese individuals.

Design and Methods
Eleven obese subjects (>30 kg/m2) underwent three 12-h study days: control condition [sedentary behavior (SED)], continuous exercise condition [(EX) 1-h exercise], and intermittent exercise condition [(INT) 12 hourly, 5-min bouts]. Blood samples (every 10 min) were measured for serum insulin and total peptide YY (PYY) concentrations, with ratings of appetite (visual analog scale [VAS): every 20 min]. Both total area under the curve (AUC), and subjective appetite ratings were calculated.

Results
No differences were observed in total PYY AUC between conditions, but hunger was reduced with INT (INT < EX; P < 0.05), and satiety was increased with both SED and INT conditions (INT > EX and SED > EX; P < 0.05). A correlation existed between the change in total PYY and insulin levels (r = −0.81; P < 0.05), and total PYY and satiety (r = 0.80; P < 0.05) with the EX condition, not the SED and INT conditions.

Conclusions
The total PYY response to meals is not altered over the course of a 12-h day with either intermittent or continuous exercise; however, intermittent exercise increased satiety and reduced hunger to a greater extent than continuous exercise in obese individuals.

Publication Type: Journal Article
Murdoch Affiliation: School of Chiropractic and Sports Science
Publisher: Wiley-Blackwell
Copyright: © 2013 The Obesity Society
URI: http://researchrepository.murdoch.edu.au/id/eprint/19265
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