Skeletal muscle ECF pH error signal for exercise ventilatory control.

Skeletal muscle ECF pH error signal for exercise ventilatory control.
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用于运动通气控制的骨骼肌 ECF pH 误差信号。

DOI:
10.1152/jappl.1998.84.1.90
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发表时间:
1998
期刊:
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子:
--
通讯作者:
Systrom,DM
Systrom,DM
中科院分区:
--
文献类型:
--
作者:
Evans,AB;Tsai,LW;Oelberg,DA;Kazemi,H;Systrom,DM

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Evans, Allison B., Larry W. Tsai, David A. Oelberg, Homayoun Kazemi, and David M. Systrom.Skeletal muscle ECF pH error signal for exercise ventilatory control.J. Appl. Physiol.84(1): 90–96, 1998.—An autonomic reflex linking exercising skeletal muscle metabolism to central ventilatory control is thought to be mediated by neural afferents having free endings that terminate in the interstitial fluid of muscle. To determine whether changes in muscle extracellular fluid pH (pHe) can provide an error signal for exercise ventilatory control, pHewas measured during electrically induced contraction by31P-magnetic resonance spectroscopy and the chemical shift of a phosphorylated, pH-sensitive marker that distributes to the extracellular fluid (phenylphosphonic acid). Seven lightly anesthetized rats underwent unilateral continuous 5-Hz sciatic nerve stimulation in an 8.45-T nuclear magnetic resonance magnet, which resulted in a mixed lactic acidosis and respiratory alkalosis, with no net change in arterial pH. Skeletal muscle intracellular pH fell from 7.30 ± 0.03 units at rest to 6.72 ± 0.05 units at 2.4 min of stimulation and then rose to 7.05 ± 0.01 units (P< 0.05), despite ongoing stimulation and muscle contraction. Despite arterial hypocapnia, pHeshowed an immediate drop from its resting baseline of 7.40 ± 0.01 to 7.16 ± 0.04 units (P< 0.05) and remained acidic throughout the stimulation protocol. During the on- and off-transients for 5-Hz stimulation, changes in the pH gradient between intracellular and extracellular compartments suggested time-dependent recruitment of sarcolemmal ion-transport mechanisms. pHeof exercising skeletal muscle meets temporal and qualitative criteria necessary for a ventilatory metaboreflex mediator in a setting where arterial pH does not.
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