title: Effects of exercise training on gut hormone levels after a single bout of exercise in middle-aged Japanese women.
abstract: The purpose of this study was to investigate the effects of 12 weeks of exercise training on gut hormone levels after a single bout of exercise in middle-aged Japanese women. Twenty healthy middle-aged women were recruited for this study. Several measurements were performed pre and post exercise training, including: body weight and composition, peak oxygen consumption (peak VO2), energy intake after the single bout of exercise, and the release of gut hormones with fasting and after the single bout of exercise. Exercise training resulted in significant increases in acylated ghrelin fasting levels (from 126.6 ± 5.6 to 135.9 ± 5.4 pmol/l, P < 0.01), with no significant changes in GLP-1 (from 0.54 ± 0.04 to 0.55 ± 0.03 pmol/ml) and PYY (from 1.20 ± 0.07 to 1.23 ± 0.06 pmol/ml) fasting levels. GLP-1 levels post exercise training after the single bout of exercise were significantly higher than those pre exercise training (areas under the curve (AUC); from 238.4 ± 65.2 to 286.5 ± 51.2 pmol/ml x 120 min, P < 0.001). There was a tendency for higher AUC for the time courses of PYY post exercise training than for those pre exercise training (AUC; from 519.5 ± 135.5 to 551.4 ± 128.7 pmol/ml x 120 min, P = 0.06). Changes in (delta) GLP-1 AUC were significantly correlated with decreases in body weight (r = -0.743, P < 0.001), body mass index (r = -0.732, P < 0.001), percent body fat (r = -0.731, P < 0.001), and energy intake after a single bout exercise (r = -0.649, P < 0.01) and increases in peak VO2 (r = 0.558, P < 0.05). These results suggest that the ability of exercise training to create a negative energy balance relies not only directly on its impact on energy expenditure, but also indirectly on its potential to modulate energy intake.
authors.affiliation: Department of Acupuncture, Morinomiya University of Medical Sciences, 1-26-16, Nankokita, Suminoe-ku, Osaka City, Osaka, 559-8611 Japan.
authors.forename: Shin-Ya
authors.initials: SY
authors.lastname: Ueda
authors.forename: Tadayoshi
authors.initials: T
authors.lastname: Miyamoto
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Nakahara
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Shishido
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Usui
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Katsura
authors.forename: Takahiro
authors.initials: T
authors.lastname: Yoshikawa
authors.forename: Shigeo
authors.initials: S
authors.lastname: Fujimoto
keywords: Exercise training; Ghrelin; Glucagon-like peptide-1; Peptide YY