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The latissimus dorsi muscles of six dogs were made fatigue resistant by chronic electrical conditioning. Once the muscles were conditioned, oxygen consumption was measured during periods of exercise. The ratio of the tension developed to oxygen consumed during moderate stimulation (300 msec on) for the control and the electrically conditioned muscles was 16.3 +/- 3.5 and 36.5 +/- 6.7 kg-sec/ml oxygen, respectively. During intense stimulation (800 msec on) the ratio was 12.6 +/- 2.1 and 54.2 +/- 8.9 kg-sec/ml oxygen, respectively. Thus the conditioned muscle was able to develop and maintain tension with a considerably reduced oxygen expenditure. The increased efficiency of the conditioned muscle helps to explain its increased resistance to fatigue and the ability of pumping chambers constructed from electrically preconditioned skeletal muscle to perform sustained cardiac type work.
M Acker, and
W A Anderson, and
R L Hammond, and
F DiMeo, and
J McCullum, and
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M Velchik, and
W E Brown, and
D Gale, and
S Salmons
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Acta cientifica venezolana,
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J McCullum, and
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January 1946,
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February 1988,
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July 1959,
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D Gale, and
S Salmons
December 1991,
European journal of biochemistry,
M Acker, and
W A Anderson, and
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January 1985,
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M Acker, and
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