Key result
Long-term exposure to microgravity significantly increased the total spectral power of heart rate variability from 154.9 msec^2 before flight to 532.7 msec^2 (p<0.05).
Why the study?
Does long-term exposure to space's microgravity alter heart rate variability in healthy astronauts?
Population
10 healthy astronauts (8 men, mean age 49.1 ± 4.2 years)
Comparison
Long-term exposure to space's microgravity vs Earth baseline and after return to Earth
Design
Cohort
Follow-up
152.8 ± 16.1 days after launch and after return to Earth
Authors
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HRV changes in microgravity may signal adaptation in astronauts; leaves open need for monitoring or countermeasures in long-duration flight.
Observational (n=10)
Does long-term exposure to space's microgravity alter heart rate variability in healthy astronauts?
Absolute Event Rate: 532.7% vs 154.9%
p-value: p=<0.05
Long-term exposure to microgravity significantly alters heart rate variability, particularly amplifying the 90-minute basic rest-activity cycle, suggesting a physiological adaptation to spaceflight.
Otsuka et al. (2016) conducted an observational in Healthy astronauts (n=10). Long-term exposure to microgravity vs. Before flight (Earth) was evaluated on Total spectral power (TF) of heart rate variability (p=<0.05). Long-term exposure to microgravity significantly increased the total spectral power of heart rate variability from 154.9 msec^2 before flight to 532.7 msec^2 (p<0.05).
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