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• W1965288611 abstract "Based on proportional changes in V̇ O2,max with alterations in O 2 delivery, it is widely held that O 2 availability limits V̇ O2,max . In contrast, reductions in V̇ O2,max are also seen when mitochondrial oxidative capacity is reduced. Taken collectively, these prior results are consistent with the notion that there is not a single‐step limitation to V̇ O2,max . We used a pump‐perfused rat hindlimb model to test the hypothesis that combining moderate reductions in O 2 delivery and mitochondrial oxidative capacity would yield a greater reduction in V̇ O2,max than seen when performing each intervention independently, demonstrating an interaction between O 2 supply and mitochondrial oxidative capacity in determining V̇ O2,max . Four groups of animals were studied: two in high O 2 delivery conditions (hindlimb O 2 delivery: 88 ± 1 μmol O 2 min −1 ; mean ± s.e.m. ) and two in moderately reduced O 2 delivery conditions (66 ± 2 μmol O 2 min −1 ). One group at each level of O 2 delivery was treated with 0.1 μM myxothiazol to reduce mitochondrial oxidative capacity via competitive inhibition of NADH cytochrome c reductase. V̇ O2,max in control animals (no myxothiazol) was 29 % lower in the moderately reduced O 2 delivery group (592 ± 24 mmol O 2 min −1 (100 g) −1 ); P < 0.05 ) than in the high O 2 delivery group (833 ± 63 μmol O 2 min −1 (100 g) −1 ). Similarly, V̇ O2,max was reduced by 29 % (594 ± 22 μmol O 2 min −1 (100 g) −1 ); P < 0.05 ) in myxothiazol‐treated animals in high O 2 delivery conditions compared to control animals in high O 2 delivery conditions. When myxothiazol treatment was combined with moderately reduced O 2 delivery, V̇ O2,max was reduced by an additional 18 % (484 ± 21 μmol O 2 min −1 (100 g) −1 ); P < 0.05 ) compared to either intervention performed independently. These results show that O 2 supply and mitochondrial oxidative capacity interact to determine V̇ O2,max ." @default.
• W1965288611 created "2016-06-24" @default.
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• W1965288611 date "2002-06-01" @default.
• W1965288611 modified "2023-10-18" @default.
• W1965288611 title "Oxidative capacity interacts with oxygen delivery to determine maximal O₂ uptake in rat skeletal muscles <i>in situ</i>" @default.
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• W1965288611 doi "https://doi.org/10.1113/jphysiol.2001.013649" @default.
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