Scaling of Power Output in Fast Muscle Fibres of the Atlantic Cod During Cyclical Contractions
Fast muscle fibres were isolated from abdominal myotomes of Atlantic cod ( Gadus morhua L.) ranging in size from 10 to 63 cm standard length ( L s ). Muscle fibres were subjected to sinusoidal length changes about their resting length ( L f ) and stimulated at a selected phase of the strain cycle. T...
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fthighwire:oai:open-archive.highwire.org:jexbio:170/1/143 2023-05-15T15:27:23+02:00 Scaling of Power Output in Fast Muscle Fibres of the Atlantic Cod During Cyclical Contractions ANDERSON, M. ELIZABETH JOHNSTON, IAN A. 1992-09-01 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/170/1/143 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/170/1/143 Copyright (C) 1992, Company of Biologists Journal Articles TEXT 1992 fthighwire 2013-05-27T17:14:52Z Fast muscle fibres were isolated from abdominal myotomes of Atlantic cod ( Gadus morhua L.) ranging in size from 10 to 63 cm standard length ( L s ). Muscle fibres were subjected to sinusoidal length changes about their resting length ( L f ) and stimulated at a selected phase of the strain cycle. The work performed in each oscillatory cycle was calculated from plots of force against muscle length, the area of the resulting loop being net work. Strain and the number and timing of stimuli were adjusted to maximise positive work per cycle over a range of cycle frequencies at 8°C. Force, and hence power output, declined with increasing cycles of oscillation until reaching a steady state around the ninth cycle. The strain required for maximum power output ( W max ) was ±7-11% of L f in fish shorter than 18 cm standard length, but decreased to ±5 % of L f in larger fish. The cycle frequency required for W max also declined with increasing fish length, scaling to L s -0.51 under steady-state conditions (cycles 9-12). At the optimum cycle frequency and strain the maximum contraction velocity scaled to L s -0.79. The maximum stress ( P max ) produced within a cycle was highest in the second cycle, ranging from 51.3 kPa in 10 cm fish to 81.8 kPa in 60 cm fish ( P max =28.2 L s 0.25). Under steady-state conditions the maximum power output per kilogram wet muscle mass was found to range from 27.5 W in a 10 cm L s cod to 16.4 W in a 60 cm L s cod, scaling with L s -0.29 and body mass ( M b )-0.10 Text atlantic cod Gadus morhua HighWire Press (Stanford University) |
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Journal Articles ANDERSON, M. ELIZABETH JOHNSTON, IAN A. Scaling of Power Output in Fast Muscle Fibres of the Atlantic Cod During Cyclical Contractions |
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Journal Articles |
description |
Fast muscle fibres were isolated from abdominal myotomes of Atlantic cod ( Gadus morhua L.) ranging in size from 10 to 63 cm standard length ( L s ). Muscle fibres were subjected to sinusoidal length changes about their resting length ( L f ) and stimulated at a selected phase of the strain cycle. The work performed in each oscillatory cycle was calculated from plots of force against muscle length, the area of the resulting loop being net work. Strain and the number and timing of stimuli were adjusted to maximise positive work per cycle over a range of cycle frequencies at 8°C. Force, and hence power output, declined with increasing cycles of oscillation until reaching a steady state around the ninth cycle. The strain required for maximum power output ( W max ) was ±7-11% of L f in fish shorter than 18 cm standard length, but decreased to ±5 % of L f in larger fish. The cycle frequency required for W max also declined with increasing fish length, scaling to L s -0.51 under steady-state conditions (cycles 9-12). At the optimum cycle frequency and strain the maximum contraction velocity scaled to L s -0.79. The maximum stress ( P max ) produced within a cycle was highest in the second cycle, ranging from 51.3 kPa in 10 cm fish to 81.8 kPa in 60 cm fish ( P max =28.2 L s 0.25). Under steady-state conditions the maximum power output per kilogram wet muscle mass was found to range from 27.5 W in a 10 cm L s cod to 16.4 W in a 60 cm L s cod, scaling with L s -0.29 and body mass ( M b )-0.10 |
format |
Text |
author |
ANDERSON, M. ELIZABETH JOHNSTON, IAN A. |
author_facet |
ANDERSON, M. ELIZABETH JOHNSTON, IAN A. |
author_sort |
ANDERSON, M. ELIZABETH |
title |
Scaling of Power Output in Fast Muscle Fibres of the Atlantic Cod During Cyclical Contractions |
title_short |
Scaling of Power Output in Fast Muscle Fibres of the Atlantic Cod During Cyclical Contractions |
title_full |
Scaling of Power Output in Fast Muscle Fibres of the Atlantic Cod During Cyclical Contractions |
title_fullStr |
Scaling of Power Output in Fast Muscle Fibres of the Atlantic Cod During Cyclical Contractions |
title_full_unstemmed |
Scaling of Power Output in Fast Muscle Fibres of the Atlantic Cod During Cyclical Contractions |
title_sort |
scaling of power output in fast muscle fibres of the atlantic cod during cyclical contractions |
publisher |
Company of Biologists |
publishDate |
1992 |
url |
http://jeb.biologists.org/cgi/content/short/170/1/143 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
http://jeb.biologists.org/cgi/content/short/170/1/143 |
op_rights |
Copyright (C) 1992, Company of Biologists |
_version_ |
1766357828570710016 |