Interaction of factors determining oxygen uptake at the onset of exercise.

Interaction of factors determining oxygen uptake at the onset of exercise.
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决定运动开始时摄氧量的因素的相互作用。

DOI:
10.1152/jappl.1999.86.4.1101
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发表时间:
1999
影响因子:
3.3
通讯作者:
R. Hughson
R. Hughson
中科院分区:
医学2区
文献类型:
--
作者:
M. Tschakovsky;R. Hughson

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关于运动开始时骨骼肌耗氧量(QO2)的适应率是否受限于1)内在细胞代谢信号和酶激活的惯性或2)线粒体的O2可用性(由对流和扩散O2运输机制的外在惯性决定),存在相当大的争议。这篇评论严格审查的证据,这两个假设,并澄清了重要的限制,在这个问题的实验和理论方法。生物化学证据的综述表明,给定的呼吸速率是磷酸化电位和氧化还原电位以及细胞线粒体PO2(PmitoO2)的净驱动的函数。磷酸化和氧化还原电位的变化由内在代谢惯性决定。PmitoO2由运动适应过程中对流和扩散O2运输机制的外在惯性和线粒体O2利用率决定。在许多运动条件下,PmitoO2似乎在能够调节肌肉代谢的范围内。在这种情况下,细胞磷酸盐能量状态的调整将作为细胞溶质的“转换器”,将ATP消耗与线粒体ATP产生联系起来,从而将O2消耗联系起来。还原当量和O2的可用性将调节QO2的适应速率。
Considerable debate surrounds the issue of whether the rate of adaptation of skeletal muscle O2 consumption (QO2) at the onset of exercise is limited by 1) the inertia of intrinsic cellular metabolic signals and enzyme activation or 2) the availability of O2 to the mitochondria, as determined by an extrinsic inertia of convective and diffusive O2 transport mechanisms. This review critically examines evidence for both hypotheses and clarifies important limitations in the experimental and theoretical approaches to this issue. A review of biochemical evidence suggests that a given respiratory rate is a function of the net drive of phosphorylation potential and redox potential and cellular mitochondrial PO2 (PmitoO2). Changes in both phosphorylation and redox potential are determined by intrinsic metabolic inertia. PmitoO2 is determined by the extrinsic inertia of both convective and diffusive O2 transport mechanisms during the adaptation to exercise and the rate of mitochondrial O2 utilization. In a number of exercise conditions, PmitoO2 appears to be within a range capable of modulating muscle metabolism. Within this context, adjustments in the phosphate energy state of the cell would serve as a cytosolic "transducer," linking ATP consumption with mitochondrial ATP production and, therefore, O2 consumption. The availability of reducing equivalents and O2 would modulate the rate of adaptation of QO2.
有氧代谢的简单模型:在肌肉工作转换中的应用。
DOI: 10.1152/ajpcell.1990.258.6.c995
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DOI: --
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影响因子: --
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