SYMPATHETIC-NERVE DISCHARGE IS COUPLED TO MUSCLE-CELL PH DURING EXERCISE IN HUMANS
SYMPATHETIC-NERVE DISCHARGE IS COUPLED TO MUSCLE-CELL PH DURING EXERCISE IN HUMANS
复制标题
DOI：
10.1172/jci113730
复制
发表时间：
1988-10-01
影响因子：
15.9
通讯作者：
NUNNALLY, RL
中科院分区：
文献类型：
--
作者：
VICTOR, RG;BERTOCCI, LA;NUNNALLY, RL
We used phosphorus nuclear magnetic resonance spectroscopy (31P-NMR) to probe the cellular events in contracting muscle that initiate the reflex stimulation of sympathetic outflow during exercise. In conscious humans, we performed 31P-NMR on exercising forearm muscle and simultaneously recorded muscle sympathetic nerve activity (MSNA) with microelectrodes in the peroneal nerve to determine if the activation of MSNA is coupled to muscle pH, an index of glycolysis, or to the concentrations (II) of inorganic phosphate (Pi) and adenosine diphosphate (ADP) which are moulators of mitochondrial respiration. During both static and rhythmic handgrip, the onset of sympathetic activation in resting muscle coincided with the development of cellular acidification in active muscle. Furthermore, increases in MSNA were correlated closely with decreases in intracellular pH but dissociated from changes in phosphocreatine ([PCr]), [Pi], and [ADP]. The principal new conclusion is that activation of muscle sympathetic outflow during exercise in humans is coupled to the cellular accumulation of protons in contracting muscle.
