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Published on: April 28, 2016
Plasma ghrelin levels during exercise - effects of intensity and duration
Johannes Erdmann1, Rana Tahbaz, Florian Lippl
1Else-Kröner-Fresenius Center of Nutritional Medicine, Technical University of Munich, Germany. johannes.erdmann@lrz.tum.de
Regulatory Peptides
|June 16, 2007
Summary
Low-intensity exercise, but not high-intensity, stimulates ghrelin (appetite hormone) release in humans. Prolonged exercise increases food intake, but this effect is not linked to ghrelin levels.
Area of Science:
- Endocrinology
- Exercise Physiology
- Nutritional Science
Background:
- Ghrelin, a gastric hormone, regulates appetite, food intake, and energy homeostasis.
- Exercise is known to influence hunger, satiety, and eating behaviors.
Purpose of the Study:
- To investigate the impact of exercise intensity and duration on ghrelin release.
- To examine the relationship between exercise-induced ghrelin changes and subsequent food intake.
Main Methods:
- Healthy subjects performed graded bicycle ergometer exercise at varying intensities (50 W vs. 100 W) and durations (30, 60, 120 min).
- Blood samples were collected to measure ghrelin concentrations.
- Subjects reported hunger/satiety levels and consumed ad libitum meals post-exercise.
Main Results:
- Low-intensity exercise (50 W) increased ghrelin levels, while higher intensity (100 W) did not.
- Ghrelin concentrations rose significantly with prolonged low-intensity exercise (up to 120 min).
- Food intake increased significantly after 120 min of exercise compared to shorter durations and controls, independent of premeal ghrelin levels.
Conclusions:
- Low-intensity exercise stimulates ghrelin release, irrespective of duration.
- The increased food intake observed after prolonged exercise is not primarily mediated by ghrelin level changes.
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