Responses of Contractile Properties in Rat Soleus to High-Energy Phosphates and/or Unloading

T. Wakatsuki, Y. Ohira, M. Yamamoto, W. Yasui, K. Nakamura, T. Asakura, H. Ohno

研究成果: Article査読

40 被引用数 (Scopus)

抄録

Responses of contractile properties of soleus to unloading and/or changes in high-energy phosphate contents were studied in rats. Reduction of high-energy phosphates, especially phosphocreatine, in ankle extensors was induced by feeding β-guanidinopropionic acid (β-GPA). The major finding in the study was that the fatigability and speed-related contractile properties responded to unloading and creatine supplementation in a similar manner. The high-energy phosphate contents tended to be elevated after 10-d supplementation of creatine and hindlimb suspension. The shift toward slow-type, mainly due to an increased one-half relaxation time, was seen in rats fed β-GPA. Such a shift was reversed by feeding creatine or by hindlimb suspension; however, the suspension-induced shift of contractile properties toward fast-type was not prevented completely by β-GPA feeding. Although the muscle fatigue resistance did not change by β-GPA feeding alone, the decrease in fatigue resistance following suspension and creatine supply was less in the β-GPA group. It is suggested that the levels of high-energy phosphates and tension production play important roles in the regulation of contractile properties of the soleus muscle.

本文言語English
ページ(範囲)193-204
ページ数12
ジャーナルJapanese Journal of Physiology
44
2
DOI
出版ステータスPublished - 1994
外部発表はい

All Science Journal Classification (ASJC) codes

  • 生理学

フィンガープリント

「Responses of Contractile Properties in Rat Soleus to High-Energy Phosphates and/or Unloading」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル