spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Lou, F.
Right arrow Articles by Woledge, R. C.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Lou, F.
Right arrow Articles by Woledge, R. C.

Journal of Experimental Biology, Vol 203, Issue 7 1201-1210, Copyright © 2000 by Company of Biologists

JOURNAL ARTICLES

Heat production and oxygen consumption during metabolic recovery of white muscle fibres from the dogfish Scyliorhinus canicula

F Lou, WJ van Der Laarse, NA Curtin and RC Woledge
Cellular and Integrative Biology, Division of Biomedical Sciences, Fleming Building, Imperial College School of Medicine, London SW7 2AZ, UK.

Oxygen consumption and heat production were measured during contraction and recovery of isolated, white muscle fibres from dogfish (Scyliorhinus canicula) at 19 degrees C. The contraction period consisted of 20 isometric twitches at 3 Hz; this was followed by a recovery period of 2 h without stimulation. We tested the hypothesis that recovery is wholly oxidative (not glycolytic) in these fibres. The following features support this hypothesis. (i) The ratio of total heat produced to oxygen consumed, 451+/-34 kJ mol(-)(1) (mean +/- s.e.m., N=29), was close to that expected for either the oxidation of carbohydrate, 473 kJ mol(-)(1), or the oxidation of fat, 439 kJ mol(-)(1). Even assuming the maximum value (95 % confidence limit) of the observed heat production, glycolysis could account for resynthesis of at most 18 % of the ATP used during the contractions. (ii) When the difference in rates of diffusion of oxygen and heat within the muscle are taken into account, the time courses of oxygen consumption and heat production match each other well during the entire recovery period. The efficiency of recovery (=energy used for ATP synthesis/energy available for ATP synthesis) was estimated from the results. This value, 84.0+/-20.1 % (mean +/- s.e.m., N=29), is relatively high and represents the first such measurement in functioning muscle.


This article has been cited by other articles:


Home page
 J. Physiol.Home page
C. J. Barclay and C. L. Weber
Slow skeletal muscles of the mouse have greater initial efficiency than fast muscles but the same net efficiency
J. Physiol., September 1, 2004; 559(2): 519 - 533.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
C. J. Barclay, C. Widen, and L. J. Mellors
Initial mechanical efficiency of isolated cardiac muscle
J. Exp. Biol., August 15, 2003; 206(16): 2725 - 2732.
[Abstract] [Full Text] [PDF]


© The Company of Biologists Ltd 2000