Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2011) 10, 283 - 291

Research article
The Effects of Exercise on Food Intake and Hunger: Relationship with Acylated Ghrelin and Leptin
Serife Vatansever-Ozen1, Gul Tiryaki-Sonmez3, , Guler Bugdayci2, Guclu Ozen1
Author Information
1 School of Physical Education and Sports,
2 Department of Biochemistry, Faculty of Medicine, Abant Izzet Baysal University, Bolu, Turkey
3 Department of Health Sciences, Lehman College, Bronx, New York, USA

Gul Tiryaki-Sonmez
✉ Department of Health Sciences, Program of Exercise Science, APEX Building, Room # 265, Lehman College, CUNY, 250 Bedford Park Blv. West Bronx, NY 10468, USA
Email: gultiryakisonmez@gmail.com
Publish Date
Received: 18-10-2010
Accepted: 31-01-2011
Published (online): 01-06-2011
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ABSTRACT

This study investigated the effects of a long bout of aerobic exercise on hunger and energy intake and circulating levels of leptin and acylated ghrelin. Ten healthy male subjects undertook two, 4 h trials in a randomized crossover design. In the exercise trial subjects ran for 105 min at 50% of maximal oxygen uptake and the last 15 min at 70% of maximal oxygen uptake followed by a 120 min rest period. In the control trial, subjects rested for 4 h. Subjects consumed a buffet test meal at 180 min during each trial. Hunger ratings, acylated ghrelin, leptin, glucose and insulin concentrations were measured at 0, 1, 2, 3 and 4 h. No differences were found at baseline values for hunger, acylated ghrelin, leptin, insulin and glucose for both trials (p > 0.05). The estimated energy expenditure of the exercise trial was 1550 ± 136 kcal. Exercise did not change subsequent absolute energy intake, but produced a significant decrease (p < 0.05) in relative energy intake. A two-way ANOVA revealed a significant (p < 0. 05) interaction effect for hunger and acylated ghrelin. In conclusion, this exercise regimen had a positive effect on reducing appetite which is related to reduced acylated ghrelin responses over time. This finding lends support for a role of exercise in weight management.

Key words: Energy intake, energy expenditure, exercise, hunger, acylated ghrelin, weight loss, appetite


           Key Points
  • Physical exercise is a strategy used to counteract obesity, since it lowers the energetic balance by increasing energy expenditure. However, because any energy expended in exercise elevates the intensity of hunger and drives food consumption, it is pertinent to ask how effective exercise could be in helping people to lose weight or to prevent weight gain.
  • The effects of exercise on hunger sensations and food intake are fairly controversial and depend on the intensity and duration of exercise.
  • 120 min prolonged treadmill exercise with mix intensity, temporarily decreased hunger sensations, acylated ghrelin and relative energy intake.
  • Variations in exercise intensity should theoretically be a useful means of weight loss.
 
 
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