Effects of antihypertensive drugs and exercise training on insulin sensitivity in spontaneously hypertensive rats

Qi Guo, Naoyoshi Minami, Nobuyoshi Mori, Makoto Nagasaka, Osamu Ito, Hajime Kurosawa, Masayuki Kanazawa, Masahiro Kohzuki

研究成果: Article査読

13 被引用数 (Scopus)

抄録

We examined the effects of antihypertensive drugs, exercise training, and combinations thereof on insulin sensitivity (IS), and the association between this relation and sympathetic activity, muscle fiber composition, and capillary density in spontaneously hypertensive rats (SHR). Six-week-old male SHR were allocated to 7 groups: a control group (C), and groups treated with azelnidipine (Aze) (a calcium channel blocker), olmesartan (Olm) (an anglotensin II type 1 receptór blocker), exercise training (Exe), and combinations of drugs and exercise training (Aze+Exe, Olm+Exe, and Olm+Azd+Exe). At age 18 weeks, IS and sympathetic activity were evaluated by an euglycemic hyperinsulinemic glucose clamp technique and power spectral analysis of systolic blood pressure, respectively. After the experiments, capillary density and muscle fiber composition in soleus muscle were examined. Aze or Exe alone significantly increased IS associated with a significant reduction in sympathetic activity. Olm alone tended to increase IS with little change in sympathetic activity. Aze, Olm, or Exe significantly increased the capillary density and percentage of insulin-sensitive type I fiber. A combination of Aze and Exe or a combination of Olm and Exe tended to increase IS compared with each drug therapy alone. There were significant correlations between IS and sympathetic activity, capillary density, and the percentage of type I fiber in all the rats. We found that Aze improved IS more substantially compared with Olm in SHR. We also found that Aze, Olm, Exe, and combinations thereof improved IS, probably through the modulation of sympathetic activity or capillarity and muscle fiber type in skeletal muscles.

本文言語English
ページ(範囲)525-533
ページ数9
ジャーナルHypertension Research
31
3
DOI
出版ステータスPublished - 2008 3

ASJC Scopus subject areas

  • 内科学
  • 生理学
  • 循環器および心血管医学

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