Key result
Stepwise tension reduction in kitten papillary muscle during Ba2+-contracture produced a transient length response consisting of four distinct phases, with a second phase time constant of 106 msec.
The transient length response of cardiac muscle to stepwise tension reduction reveals four distinct phases, supporting and extending viscoelastic models of cross-bridge kinetics.
No immediate clinical implications; extends viscoelastic models of cross-bridge kinetics.
The transient length response of the cat papillary muscle in Ba2+-contracture to stepwise tension reduction was found to consist of four different phases. This result is discussed in relation to the transient tension response of the same preparation observed in the previous length-clamp experiments.
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Saeki et al. (1982) studied Ba2+-contracture in kitten papillary muscle (n=7). Stepwise tension reduction vs. Resting muscle and rigor muscle treated with iodoacetic acid was evaluated on Transient length response. Stepwise tension reduction in kitten papillary muscle during Ba2+-contracture produced a transient length response consisting of four distinct phases, with a second phase time constant of 106 msec.
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