NDLI: Energy storage during stretch of active single fibres from frog skeletal muscle

Content Provider	PubMed Central
Author	Linari, Marco Woledge, R. C. Curtin, N. A.
Copyright Year	2003
Abstract	Heat production and force were measured during tetani of single muscle fibres from anterior tibialis of frog. During stimulation fibres were either kept under isometric conditions, or were stretched or allowed to shorten (at constant velocity) after isometric force had reached its plateau value. The energy change was evaluated as the sum of heat and work (work = integral of force with respect to length change). Net energy absorption occurred during stretch at velocities greater than about 0.35 L 0 s−1 (L 0 is fibre length at resting sarcomere length 2.10 μm). Heat produced by 1 mm segments of the fibre was measured simultaneously and separately; energy absorption is not an artefact due to patchy heat production. The maximum energy absorption, 0.092 ± 0.002 P 0 L 0 (mean ±s.e.m., n = 8; where P 0 is isometric force at L 0), occurred during the fastest stretches (1.64 L 0 s−1) and amounted to more than half of the work done on the fibre. Energy absorption occurred in two phases. The amount in the first phase, 0.027 ± 0.003 P 0 L 0 (n = 32), was independent of velocity beyond 0.18 L 0 s−1. The quantity absorbed in the second phase increased with velocity and did not reach a limiting value in the range of velocities used. After stretch, energy was produced in excess of the isometric rate, probably from dissipation of the stored energy. About 34 % (0.031 P 0 L 0/0.092 P 0 L 0) of the maximum absorbed energy could be stored elastically (in crossbridges, tendons, thick, thin and titin filaments) and by redistribution of crossbridge states. The remaining energy could have been stored in stretching transverse, elastic connections between myofibrils.
Related Links	http://dx.doi.org/10.1113/jphysiol.2002.032185
Starting Page	461
File Format	PDF
ISSN	14697793
e-ISSN	14697793
Journal	The Journal of Physiology
Issue Number	Pt 2
Volume Number	548
Language	English
Publisher	Blackwell Science Inc
Publisher Date	2003-04-15
Access Restriction	Open
Rights Holder	Blackwell Science Inc
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Sports Science

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