Influence of endurance exercise duration on PYY levels in athletes females

PYY suppresses appetite, reduces energy intake and increases energy intake. Acute exercise can increase it, but the effect of exercise activity on PYY levels is unclear. This study aimed to evaluate the effects of exercise duration on the plasma levels of peptide YY (PYY) in female recreational athletes.

Nine subjects (aged 25.3±4.9 years, body mass 73.6±5.8 kg, height 171.4±3.9 cm, and body fat 19.9±4.8 %) volunteered to participate in this study. Subjects received a standardized breakfast, which was followed by constant cycling exercise at 60% HRmax( 220-age) for 30, 60 and 90 min, or rest (control session). Blood samples were collected before, immediately after and 60 min after exercise to assess plasma PYY concentrations. Data were analyzed by repeated measures two way ANOVA and Tukey post hoc test at the significant level (p <0.05).

Plasma PYY were unaffected by duration of exercise and were higher than before exercise at immediately after exercise trials similarly.

Acute exercise increased PYY in all experimental sessions. The duration of exercise did not affect the plasma concentration of PYY and its increase was similar after all experimental sessions.