Abstract
The purpose of the present study was to investigate appetite-related hormonal responses and energy intake after a 20 km run in trained long distance runners. Twenty-three male long-distance runners completed two trials: either an exercise trial consisting of a 20 km outdoor run (EX) or a control trial with an identical period of rest (CON). Blood samples were collected to determine plasma acylated ghrelin, peptide YY3-36 (PYY3-36) and other hormonal and metabolite concentrations. Energy intake during a buffet test meal was also measured 30 min after the exercise or rest periods. Although plasma acylated ghrelin concentrations were significantly decreased after the 20 km run (p < 0.05), plasma PYY3-36 did not change significantly following exercise. Absolute energy intake during the buffet test meal in EX (1325 ± 55 kcal) was significantly lower than that in CON (1529 ± 55 kcal), and there was a relatively large degree of individual variability for exercise-induced changes in energy intake (−40.2% to 12.8%). However, exercise-induced changes in energy intake were not associated with plasma acylated ghrelin or PYY3-36 responses. The results demonstrated that a 20 km run significantly decreased plasma acylated ghrelin concentrations and absolute energy intake among well-trained long distance runners.
Highlights
Appetite regulation is closely associated with circulating hormones secreted from digestive organs.Plasma ghrelin, secreted from the stomach, is known to be the only hormone that promotes hunger and food intake [1]
King et al [6] showed that plasma ghrelin concentrations and subjective feelings of hunger were significantly impaired by 90 min of running at 70% of maximal oxygen uptake (VO2max )
Hunger scores were significantly lower in exercise trial (EX) than in consisted of a trial without exercise (CON) immediately and 15 min after exercise (p < 0.05); this significant difference was not observed between the trials 30 min after exercise
Summary
Appetite regulation is closely associated with circulating hormones secreted from digestive organs.Plasma ghrelin, secreted from the stomach, is known to be the only hormone that promotes hunger and food intake [1]. Peptide YY3-36 (PYY3-36 ) and glucagon-like peptide-1 (GLP-1) are produced in the gastrointestinal tract These hormones have the opposite role of ghrelin, resulting in attenuation of appetite [2,3,4,5]. Some inconsistent results still exist [9,10], the attenuating effect of exercise on hunger and energy intake is well established [6,7,11,12]. These findings could contribute to the design of optimal exercise prescriptions for health promotion and protection against obesity
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