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首页> 外文期刊>American Journal of Physiology >Lipid oxidation fuels recovery from exhaustive exercise in white muscle of rainbow trout.
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Lipid oxidation fuels recovery from exhaustive exercise in white muscle of rainbow trout.

机译：脂质氧化促进虹鳟白肌的力竭运动恢复。

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摘要

The oxidative utilization of lipid and carbohydrate was examined in white muscle of rainbow trout (Oncorhynchus mykiss) at rest, immediately after exhaustive exercise, and for 32-h recovery. In addition to creatine phosphate and glycolysis fueling exhaustive exercise, near maximal activation of pyruvate dehydrogenase (PDH) at the end of exercise points to oxidative phosphorylation of carbohydrate as an additional source of ATP during exercise. Within 15 min postexercise, PDH activation returned to resting values, thus sparing accumulated lactate from oxidation. Glycogen synthase activity matched the rate of glycogen resynthesis and represented near maximal activation. Decreases in white muscle free carnitine, increases in long-chain fatty acyl carnitine, and sustained elevations of acetyl-CoA and acetyl carnitine indicate a rapid utilization of lipid to supply ATP for recovery. Increases in malonyl-CoA during recovery suggest that malonyl-CoA may not regulate carnitine palmitoyltransferase-1 in trout muscle during recovery, but instead it may act to elongate short-chain fatty acids for mitochondrial oxidation. In addition, decreases in intramuscular triacylglycerol and in plasma nonesterified fatty acids indicate that both endogenous and exogenous lipid fuels may be oxidized during recovery.
机译：在静息运动后立即检查虹鳟（Oncorhynchus mykiss）的白肌肉中脂质和碳水化合物的氧化利用，并进行32小时恢复。除了磷酸肌酸和糖酵解促进了力竭运动外，运动结束时丙酮酸脱氢酶（PDH）的接近最大活化还表明碳水化合物的氧化磷酸化是运动过程中ATP的另一种来源。运动后15分钟内，PDH激活恢复到静止值，因此避免了积累的乳酸被氧化。糖原合酶的活性与糖原再合成的速率相匹配，并表现出接近最大的活化。白肌游离肉碱的减少，长链脂肪酰基肉碱的增加以及乙酰辅酶A和乙酰肉碱的持续升高表明脂质快速利用脂质来提供ATP以供恢复。恢复过程中丙二酰-CoA的增加表明，丙二酰-CoA可能不会在恢复过程中调节鳟鱼肌肉中的肉碱棕榈酰转移酶-1，但它可能会延长短链脂肪酸的线粒体氧化作用。另外，肌内三酰基甘油和血浆非酯化脂肪酸的减少表明内源性和外源性脂质燃料在恢复过程中均可能被氧化。

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