Show HN: Saunas lower nighttime heart rate more than exercise (n=59,000)
5 hours ago
- #menstrual cycle effects
- #sauna recovery
- #heart rate
- Sauna days show lower nighttime minimum heart rate (by ~3bpm) even after controlling for activity, indicating a physiological recovery signal not just due to exercise.
- Activity levels and maximum/average heart rates are higher on sauna days, often aligning with post-workout sauna use.
- The benefits of saunas on heart rate vary by gender and menstrual cycle phase, with significant effects in women primarily during the luteal phase.
- Statistical analysis (FDR-corrected p < 0.05, Cohen’s d > 0.2) confirms robust same-day recovery effects from sauna use.
- Saunas induce heat stress that temporarily increases heart rate, followed by parasympathetic recovery during cooling, supporting long-term cardiovascular health.