Journal of Muscle Research & Cell Motility

, Volume 17, Issue 2, pp 261–268

Quantitative analysis of sarcomere non-uniformities in active muscle following a stretch

  • J. A. Talbot
  • D. L. Morgan

DOI: 10.1007/BF00124247

Cite this article as:
Talbot, J.A. & Morgan, D.L. J Muscle Res Cell Motil (1996) 17: 261. doi:10.1007/BF00124247


Electron microscopy of toad (Bufo marinus) muscle fixed without relaxing after a single eccentric contraction at muscle lengths greater than optimum showed over-stretched half-sarcomeres in sufficient numbers to account for more than half of the imposed stretch. Such sarcomeres were absent in another muscle fixed without relaxing after an isometric contraction at the same length and largely absent in a third muscle that underwent eccentric contraction at muscle lengths less than optimum. This provides direct evidence in support of the hypothesis that lengthening of muscles at long length involves lengthening of a few half sarcomeres to beyond filament overlap, while most half sarcomeres are extended much less than in proportion to muscle extension.

Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • J. A. Talbot
    • 1
  • D. L. Morgan
    • 2
  1. 1.Department of PhysiologyMonash University ClaytonAustralia
  2. 2.Department of Electrical and Computer Systems EngineeringMonash University ClaytonAustralia