PMID: 6968889Sep 1, 1980Paper

Elastic and inelastic behaviour of resting frog muscle fibres

Pflügers Archiv : European journal of physiology
R Helber

Abstract

Dynamic and static elasticity of the resting skeletal muscle of the frog have been studied as a function of the sarcomere length. Isolated intact fibres as well as glycerol extracted fibres show a resting tension starting at 2.05 microns sarcomere length and increasing approximately exponentially to 2 . 10(4) N/m2 at 3.0 microns sarcomere length. Differences between the two types of preparation were seen in the dynamic experiments. The dynamic Young's modulus of intact fibres (recorded at 1 Hz and small amplitudes) increased from 2 . 10(5) N/m2 at 2.1 microns sarcomere length to 2.5 . 10(6) N/m2 at 2.9 microns while the static modulus varied from 5 . 10(3) N/M2 to 3 . 10(5) N/m2, the dynamic modulus at small amplitudes was equivalent to the modulus of the short range elasticity (SRE). The range of the SRE did not depend on the sarcomere length and amounted to about 5 nm per sarcomere. The dynamic modulus strongly depended on the amplitude: at large amplitudes the muscle became less stiff by a factor of 10 to 20. This tendency levelled off at about 10 Hz by a strain-induced relaxation process. The dynamic modulus of the glycerol extracted fibres were nearly of the same magnitude as the static modulus, there was neither evidence ...Continue Reading

References

Mar 1, 1977·Biophysical Journal·R L Moss, W Halpern
Jan 1, 1977·The Japanese Journal of Physiology·S Matsubara, K Maruyama
Jan 1, 1975·The Japanese Journal of Physiology·S Matsubara
Oct 25, 1974·Journal of Molecular Biology·F D Carlson, A B Fraser
Feb 1, 1974·The American Journal of Physiology·X T Truong
Apr 23, 1974·Biochemical and Biophysical Research Communications·M Herbst, P Piontek

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