ArticleAmerican journal of physiology. Regulatory, integrative and comparative physiology2017
Sedentary conditions and enhanced responses to GABA in the RVLM: role of the contralateral RVLM.
Article in American journal of physiology. Regulatory, integrative and comparative physiology, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed, 15 citations in OpenAlex.
- Sedentary behavior mediates the association between weight-adjusted waist index and cardiovascular disease in patients with diabetes.PloS one · 2025Article
- Influence of sex and sedentary conditions on sympathetic burst characteristics in prepubertal, postpubertal, and young adult rats.Journal of applied physiology (Bethesda, Md. : 1985) · 2024Article
- Revisiting differential control of sympathetic outflow by the rostral ventrolateral medulla.Frontiers in physiology · 2022Article
- Sex-dependent development of enhanced sympathoexcitation in sedentary versus physically active rats.The Journal of physiology · 2021Article
- Neuroplasticity in N-methyl-d-aspartic acid receptor signaling in subregions of the rat rostral ventrolateral medulla following sedentary versus physically active conditions.The Journal of comparative neurology · 2021Article
- Exercise training in dialysis patients: impact on cardiovascular and skeletal muscle health.Clinical kidney journal · 2021Article
- Sedentary Conditions Promote Subregionally Specific Changes in Brain-Derived Neurotrophic Factor in the Rostral Ventrolateral Medulla.Frontiers in physiology · 2021Article
- Subregional differences in GABAThe Journal of comparative neurology · 2020Article
- Upregulation of Nav1.6 expression in the rostral ventrolateral medulla of stress-induced hypertensive rats.Hypertension research : official journal of the Japanese Society of Hypertension · 2018Article
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2 authors at 1 institution in 1 country.
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Abstract
A sedentary lifestyle is a major risk factor for cardiovascular disease, and both conditions are associated with overactivity of the sympathetic nervous system. Ongoing discharge of sympathetic nerves is regulated by the rostral ventrolateral medulla (RVLM), which in turn is modulated by the primary excitatory and inhibitory neurotransmitters glutamate and γ-amino-butyric acid (GABA), respectively. We reported previously that sedentary conditions enhance GABAergic modulation of sympathoexcitation in the RVLM, despite overall increased sympathoexcitation. Thus the purpose of this study was to test the hypothesis that sedentary conditions increase responsiveness to GABA in RVLM. Male Sprague-Dawley rats performed either chronic wheeling running or remained sedentary for 12-15 wk. Animals were instrumented to perform RVLM microinjections under Inactin anesthesia while mean arterial pressure (MAP) and splanchnic sympathetic nerve activity (SSNA) were recorded. Unilateral microinjections of GABA (30 nl, 0.3-600 mM) into the RVLM produced dose-dependent decreases in MAP and SSNA; however, no group differences were observed. Inhibition of the contralateral RVLM (muscimol, 2 mM, 90 nl) caused decreases in MAP and SSNA that were not different between groups but enhanced decreases in SSNA to GABA in sedentary rats only. In sinoaortic denervated rats, GABA microinjections before or after inhibition of the contralateral RVLM caused decreases in MAP and SSNA that were not different between groups. Our results suggest that the contralateral RVLM plays an important role in buffering responses to inhibition of the ipsilateral RVLM under sedentary but not physically active conditions. Based on these studies and others, sedentary conditions appear to enhance both sympathoinhibitory and sympathoexcitatory mechanisms in the RVLM. Enhanced sympathoinhibition may act to reduce already elevated sympathetic nervous system activity following sedentary conditions.
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