Dependence of the Shortening Heat on Sarcomere Length in Fibre Bundles from Frog Semitendinosus Muscles

  • Kazuhiro Yamada
  • Kaoru Kometani
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 37)


The relation between shortening heat and sarcomere length was studied using fibre bundles dissected from frog semitendinosus muscles, as well as using whole muscles. The velocity of shortening was at its maximum. The unstimulated muscles showed a large thermoelastic absorption of heat when released at long muscle lengths. However the sarcomere length at which this thermoelasticity started to appear was longer, by at least 0.3 µm per sarcomere, in fibre bundles than in whole muscles. At the same time the amount of heat absorbed was decreased in fibre bundles. The shortening heat in fibre bundles at the sarcomere lengths ranging from 2.17 to 2.74 µm, for which no correction for the thermoelasticity was necessary, decreased linearly with sarcomere length. The shortening heat in fibre bundles at longer lengths and in whole muscles was corrected by subtracting the thermoelastic heat absorption measured separately by releasing unstimulated muscles. After the correction the shortening heat showed an almost similar dependence on sarcomere length in the range from 2.0 to 3.7 µm to that seen in fibre bundles in the sarcomere length range of 2.17 to 2.74 µm.


Fibre Bundle Muscle Length Sarcomere Length Closed Cycle Frog Skeletal Muscle 
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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • Kazuhiro Yamada
    • 1
  • Kaoru Kometani
    • 1
  1. 1.Department of PhysiologyMedical College of OitaOitaJapan

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