Additive beneficial effects of lactotripeptides and aerobic exercise on arterial compliance in postmenopausal women

Mutsuko Yoshizawa, Seiji Maeda*, Asako Miyaki, Maiko Misono, Youngju Choi, Nobutake Shimojo, Ryuichi Ajisaka, Hirofumi Tanaka

*この研究の対応する著者

研究成果: Article査読

61 被引用数 (Scopus)

抄録

Central arterial compliance plays an important role in the functional abilities of the vasculature. Two active tripeptides, valine-proline-proline and isoleucine-proline-proline, were isolated from sour milk and were referred to as lactotripeptides (LTP). Because LTP appears to act as an angiotensin- converting enzyme inhibitor, it is plausible to hypothesize that LTP improves arterial compliance. We determined the effects of LTP ingestion alone or in combination with regular aerobic exercise on arterial compliance. A total of 55 postmenopausal women (50-65 yr old) were randomly divided into four groups: placebo, LTP, exercise and placebo (Ex + placebo), or exercise and LTP (Ex + LTP). LTP or placebo was administered orally for 8 wk. The exercise groups completed an 8-wk moderate aerobic exercise intervention. There were no differences in baseline arterial compliance and most other key dependent variables among the groups. Carotid arterial compliance increased significantly in the LTP (0.93 ± 0.07 vs. 0.99 ± 0.08 mm2/ mmHg·10-1), Ex + placebo (0.92 ± 0.04 vs. 1.00 ± 0.05 mm2/mmHg·10-1), and Ex + LTP groups (0.86 ± 0.06 vs. 1.00 ± 0.06 mm2/mmHg·10 -1), whereas no such changes were observed in the placebo control group (0.86 ± 0.06 vs. 0.85 ± 0.07 mm2/ mmHg·10-1). The magnitude of increases in carotid arterial compliance was significantly greater in the Ex + LTP group (19 ± 4%) than in other groups. The improvements in arterial compliance with LTP were associated with the corresponding reductions in arterial blood pressure and plasma angiotensin II concentrations. We concluded that LTP ingestion improves carotid arterial compliance and that the combination of LTP ingestion and regular exercise is additive and synergistic in improving arterial compliance in postmenopausal women.

本文言語English
ページ(範囲)H1899-H1903
ジャーナルAmerican Journal of Physiology - Heart and Circulatory Physiology
297
5
DOI
出版ステータスPublished - 2009 11
外部発表はい

ASJC Scopus subject areas

  • 生理学
  • 循環器および心血管医学
  • 生理学(医学)

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