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Mean and standard errors of HR, SDNN (indicating total HRV), and root mean square of successive differences between normal heartbeats (RMSSD; indicating high-frequency [vagal] HRV), across the first 6 h of the placebo, low-alcohol dose, and high-alcohol dose nights in men and women. In the graphs, the significant differences between alcohol conditions are marked by “caret” (low-alcohol dose night vs. placebo night), and “asterisks” (high-alcohol dose night vs. placebo night).
