期刊
AUTONOMIC NEUROSCIENCE-BASIC & CLINICAL
卷 243, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.autneu.2022.103024
关键词
Muscle sympathetic nerve activity; Microneurography; Exercise
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Japan Society for the Promotion of Science KAKENHI [19H03998]
- NSERC [06019]
The study found differences in limb-specific MSNA synchronicity during rest, handgrip exercise, and post-exercise, indicating lower synchronicity during handgrip exercise and increased synchronicity post-exercise.
Muscle sympathetic nerve activity (MSNA) is similar between limbs at rest, although a subset of MSNA bursts do demonstrate limb-specific discharge. Whether limb differences in MSNA synchronicity are present during exercise remains controversial. We concurrently measured MSNA from the radial and fibular nerves at rest and during rhythmic handgrip (RHG), static handgrip (SHG), and post-exercise circulatory occlusion (PECO). MSNA burst frequency and incidence were similar between nerve sites during all conditions. Synchronous bursts resulted in larger increases in sympathetic-blood pressure transduction compared to isolated bursts (delta + 3.6 +/- 2.1 vs. +2.3 +/- 2.4 mmHg, P = 0.01). The proportion of bursts firing synchronously between nerves at rest was slightly increased during RHG ([rest vs. exercise; mean +/- SD] 45.3 +/- 7.1 vs. 61.6 +/- 7.2 %) and similar during SHG (56.2 +/- 7.2 vs. 54 +/- 10.6 %). In contrast, burst firing synchronicity increased during PECO (83.8 +/- 12.4 %) alongside larger burst amplitudes. Inter-limb differences in resting MSNA are preserved during handgrip exercise, whereas isolated metaboreflex activation results in greater burst synchronization between limbs.
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