Key result
A 45-minute 'dry' immersion session significantly increased time-domain and frequency-domain heart rate variability parameters and decreased ApEn in healthy young subjects.
Why the study?
There was a gap in knowledge regarding the immediate mechanisms of cardiovascular regulation in humans during short-term exposure to modeled microgravity using dry immersion.
Does short-term 'dry' immersion alter heart rate variability and hemodynamics in healthy young subjects?
Observational (n=33)
Does short-term 'dry' immersion alter heart rate variability and hemodynamics in healthy young subjects?
Short-term 'dry' immersion in healthy young subjects induces a neurogenic autonomic reaction that increases heart rate variability while maintaining stable hemodynamics.
May enhance vagal tone without BP change in healthy youth; leaves open clinical relevance or broader applicability.
There is a gap in the current knowledge on the immediate mechanisms of cardiovascular regulation in human subjects within short-term exposure to modeled microgravity using “dry” immersion. Aim. The purpose of the study was to evaluate cardiovascular responses in young healthy subjects during a 45 min session with the help of linear and nonlinear heart rate variability and hemodynamics parameters. The research voluntarily enrolled 33 subjects (18 men, 15 women) aged 19–23 years old. Results. The study showed that systolic and diastolic blood pressure was quite stable, some time-domain parameters of heart rate variability (SDNN, RMSSD, pNN50, etc.) and the frequency-domain (TP, HF, LF, but not VLF) have significantly increased within a 45 min “dry” immersion session. Of the non-linear parameters of heart rate variability, only ApEn significantly decreased during the “dry” immersion session. Conclusion. Our results suggest that a short-term 45 min DI session provokes in young healthy subjects neurogenic autonomic reaction based on the baroreceptor reflex. This provides stable hemodynamics in these subjects along the “dry” immersion session.
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Gerasimova-Meigal et al. (2023) conducted an observational in Healthy (n=33). Short-term 'dry' immersion was evaluated on Cardiovascular responses including blood pressure and heart rate variability parameters. A 45-minute 'dry' immersion session significantly increased time-domain and frequency-domain heart rate variability parameters and decreased ApEn in healthy young subjects.
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