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Journal of Experimental Biology, Vol 199, Issue 2 459-463, Copyright © 1996 by Company of Biologists
JOURNAL ARTICLES |
DJ Coughlin, L Valdes and LC Rome
Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA.
Recent attempts to determine how fish muscles are used to power swimming have employed the work loop technique (driving isolated muscles using their in vivo strain and stimulation pattern). These muscle strains have in turn been determined from the anatomical high-speed cine technique. In this study, we used an independent technique, sonomicrometry, to attempt to verify these strain measurements and the conclusions based on them. We found that the strain records measured from sonomicrometry and the anatomical-cine techniques were very similar. The ratio of the strain measured from sonomicrometry to that from the anatomical-cine technique was remarkably close to unity (1.046 +/- 0.013, mean +/- S.E.M., N = 15, for transducers placed on the muscle surface and corrected for muscle depth, and 0.921 +/- 0.028, N = 8, in cases where the transducers were inserted to the average depth of the red muscle). These measurements also showed that red muscle shortening occurs simultaneously with local backbone curvature, unlike previous results which suggested that white muscle shortening during the escape response occurs prior to the change in local backbone curvature.
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