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Title

Non-standard O(2) consumption-temperature curves during rest and isometric exercise in human skeletal muscle

Authors
Springett, Roger
Delpy, David
Published in Comparative Biochemistry and Physiology. A, Molecular & Integrative Physiology. 2002, vol. 132, no. 1, p. 27-32
Abstract The present work was aimed at measuring intramuscular oxygen consumption (O(2)) as a function of temperature (T), in human forearm, during rest and aerobic isometric exercise (4% of the maximal voluntary contraction, MVC). Based upon results from in vitro experiments performed on isolated mitochondria of animal species, it was hypothesised that, during isometric exercise, the O(2)-T curve should display a maximum for some 'optimal' T. Intramuscular T and measurements were performed using a combined deep body temperature/near infrared probe during muscle cooling. At rest, O(2) increased non-linearly and monotonically as a function of T (n=8). O(2) increased approximately 2 times when going from 26 to 36 degrees C. A log(O(2))-T plot or a log(O(2))-1/T did not linearise the data. During isometric contraction, O(2) values at 26.8+/-0.6, 28.6+/-0.9, 31.9+/-0.9 and 35.9+/-0.9 degrees C were 3.04+/-1.26, 7.60+/-1.64, 4.43+/-1.95, and 6.64+/-1.37 micromol 100 g(-1) min(-1), respectively (n=6). The O(2) value at 28.6 degrees C was significantly higher (P<0.05) than that at 26.8 and 31.9 degrees C. The 'sudden' O(2) change at 28.6 degrees C is compatible with the phenomenon observed at the mitochondrial level.
Keywords AnimalsDiptera/metabolismExercise/physiologyHumansMitochondria, Muscle/metabolismMuscle, Skeletal/metabolismOxygen ConsumptionRest/physiologySpectrophotometry, InfraredTemperatureTime Factors
Identifiers
PMID: 12062187
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Research group Groupe Binzoni Tiziano (radiologie) (234)
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BINZONI, Tiziano et al. Non-standard O(2) consumption-temperature curves during rest and isometric exercise in human skeletal muscle. In: Comparative Biochemistry and Physiology. A, Molecular & Integrative Physiology, 2002, vol. 132, n° 1, p. 27-32. https://archive-ouverte.unige.ch/unige:91078

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Deposited on : 2017-01-13

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