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Science 25 September 1981:
Vol. 213. no. 4515, pp. 1523 - 1525
DOI: 10.1126/science.7280674
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Articles

Science, Vol 213, Issue 4515, 1523-1525
Copyright © 1981 by American Association for the Advancement of Science

articles

Stepwise sarcomere shortening: analysis by high-speed cinemicrography

MJ Delay, N Ishide, RC Jacobson, GH Pollack, and R Tirosh

Sarcomere shortening in striated muscle appears to follow a regionally synchronized staircase-like time course not anticipated in some cross-bridge models. The visualization method used has been criticized as subject to Bragg diffraction effects. Two independent optical methods were used to visualize a muscle during contraction; agreement between the stepwise behavior observed with the two methods suggests that the phenomenon is genuine.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)