The Effects of Circuit Resistance Training on Plasma Levels of Peptide YY and Ghrelin in Male Athletes

Background & Objectives: Ghrelin and peptide YY are orexigenic and anorexigenic peptides, respectively. They affect feeding behaviours and play a pivotal role in energy balance and glucose homeostasis. Resistance training is a key component of physical activity guidelines for weight control however, there is limited information on the effects of different intensities of circuit training on appetite. This study aimed to evaluate the effects of circuit resistance training on plasma levels of ghrelin and peptide YY (PYY) in male college student athletes. Materials and Methods: This quasi-experimental study was conducted on ۱۸ male athletes (age range: ۲۲.۱۳ ± ۲.۱۱ years, weight: ۷۵.۱۲ ± ۴.۵۱ kg, height: ۱۷۸.۱۱ ± ۵.۴۲ cm) randomly divided into ۳ groups. After obtaining informed consent and completing health record questionnaires, the subjects received circuit resistance exercise with intensities of ۴۰%, ۶۵% and ۸۰% ۱RM. In addition, blood samples were collected ۲۴ hours before and ۴۸ hours after the training program. Data analysis was performed using dependent t-test and analysis of variance (ANOVA), and P<۰.۰۵ was considered as significant. Results: Plasma levels of peptide YY had a significant increase from ۷۳.۳۲ ± ۲.۵۱ to ۷۵.۷ ± ۱۳.۸ kg at the intensity of ۸۰% ۱RM (P<۰.۰۵), while plasma levels of ghrelin had a significant decrease from ۷۳.۳۲ ± ۲.۵۱ to ۷۵.۷ ± ۱۳.۸ kg (P<۰.۰۵). However, no significant difference was observed between the intensities of ۵۰% and ۶۵% ۱RM in the plasma levels of peptide YY and ghrelin. Conclusion: According to the results of this study, circuit resistance training with ۸۰% intensity could lead to a significant increase in the level of peptide YY and decrease plasma levels of ghrelin in athletes. However, further research is required as to identify the acute and chronic side effects of resistance training.

Keywords:

Ghrelin , Peptide YY , Resistance training , تمری نهای مقاومتی , گرلین , پپتید YY