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Acute Stress Affects Heart Rate Variability During Sleep

University of Pittsburgh Department of Psychiatry (M.H., R.V., D.B., J.D.C., D.K.), Pittsburgh, PA; University of Illinois at Urbana-Champaign Department of Statistics and Beckman Institute (H.O.), IL; University of North Carolina at Chapel Hill Department of Biostatistics (Q.C.), Chapel Hill, NC; and National Institute of Aging, Baltimore, MD (J.F.T.).

View larger version (21K): [in a new window]   Fig. 1. Group differences (analysis of covariance) for all-night power in (A) HF band and (B) LF:HF ratio. Mean values are adjusted for ambient stress at baseline and wakefulness during sleep. HF power is represented as milliseconds squared/hertz, and LF:HF ratio is represented as the ratio of LF to HF spectral power. Error bars represent SD. *p < .05.

View larger version (17K): [in a new window]   Fig. 2. Group differences (analysis of covariance) for power across successive sleep periods in (A) HF band and (B) LF:HF ratio. Mean values are adjusted for ambient stress at baseline and wakefulness during sleep. HF power is represented as milliseconds squared/hertz, and LF:HF ratio is represented as the ratio of LF to HF spectral power. Error bars represent SD. *Group by time interaction is significant at the p <.05 level.