ArticleLife (Basel, Switzerland)2023
Autonomic Nervous System Adaptation and Circadian Rhythm Disturbances of the Cardiovascular System in a Ground-Based Murine Model of Spaceflight.
Article in Life (Basel, Switzerland), 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 3 citations in OpenAlex.
- Circadian clock regulation in lung health and disease: molecular mechanisms and therapeutic opportunities.EXCLI journal · 2026Review
- Simulated microgravity exposure markedly attenuates the baroreflex total loop gain and induces orthostatic hypotension in male rats.Physiological reports · 2025Article
- Comparative analysis of autonomic effects of ketamine-xylazine in normotensive and hypertensive rats.Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologica · 2025Article
- Intraocular Pressure and Retinal Nerve Fiber Layer Changes in a Microgravity Mouse Model and Relevance to Spaceflight-Associated Neuro-Ocular Syndrome.Eye and brain · 2025Article
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Authors and funding
11 authors at 3 institutions in 1 country.
Funding
Abstract
Whether in real or simulated microgravity, Humans or animals, the kinetics of cardiovascular adaptation and its regulation by the autonomic nervous system (ANS) remain controversial. In this study, we used hindlimb unloading (HU) in 10 conscious mice. Blood pressure (BP), heart rate (HR), temperature, and locomotor activity were continuously monitored with radio-telemetry, during 3 days of control, 5 days of HU, and 2 days of recovery. Six additional mice were used to assess core temperature. ANS activity was indirectly determined by analyzing both heart rate variability (HRV) and baroreflex sensitivity (BRS). Our study showed that HU induced an initial bradycardia, accompanied by an increase in vagal activity markers of HRV and BRS, together with a decrease in water intake, indicating the early adaptation to fluid redistribution. During HU, BRS was reduced; temperature and BP circadian rhythms were altered, showing a loss in day/night differences, a decrease in cycle amplitude, a drop in core body temperature, and an increase in day BP suggestive of a rise in sympathetic activity. Reloading induced resting tachycardia and a decrease in BP, vagal activity, and BRS. In addition to cardiovascular deconditioning, HU induces disruption in day/night rhythmicity of locomotor activity, temperature, and BP.
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