Resting HRV Sex Difference Detected in 2-5 Second Fluctuations
A 2026 ECG analysis involving 269 healthy young adults found that sex differences in resting heart-rate dynamics appeared in very short 2-5 second fluctuations, not in the usual 5-minute heart rate variability averages. The short-window similarity graph metric predicted male sex with an odds ratio of 2.78 (95% CI 1.32-5.86), while conventional lnRMSSD, lnHF-HRV, and …