Stretch-induced enhancement of mechanical work production in frog single fibers and human muscle

Yudai Takarada, Hiroyuki Iwamoto, Haruo Sugi, Yuichi Hirano, Naokata Ishii

研究成果: Article

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The relations between the velocity of prestretch and the mechanical energy liberated during the subsequent isovelocity release were studied in contractions of frog single fibers and human muscles. During isometric contractions of frog single fibers, a ramp stretch of varied velocity (amplitude, 0.02 fiber length; velocity, 0.08-1.0 fiber length/s) followed by a release (amplitude, 0.02 fiber length; velocity, 1.0 fiber length/s) was given, and the amount of work liberated during the release was measured. For human muscles, elbow flexions were performed with a prestretch of varied velocity (range, 40°; velocity, 30180°/s) followed by an isokinetic shortening (velocity, 99°/s). In both frog single fibers and human muscles, the work production increased with both the velocity of stretch and the peak of force attained before the release up to a certain level; thereafter it declined with the further increases of these variables. In human muscles, the enhancement of work production was not associated with a significant increase in integrated electromyogram. This suggests that changes in intrinsic mechanical properties of muscle fibers play an important role in the stretch- induced enhancement of work production.

元の言語English
ページ(範囲)1741-1748
ページ数8
ジャーナルJournal of Applied Physiology
83
発行部数5
出版物ステータスPublished - 1997 11 1
外部発表Yes

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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