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Fig. 3 | BMC Psychiatry

Fig. 3

From: Effect of behavioral activation on time and frequency domain heart rate variability in older adults with subthreshold depression: a cluster randomized controlled trial in Thailand

Fig. 3

Mean and standard deviation of heart rate variability line charts at each time point. A SDNN (ms) standard deviation of the normal-to-normal interval, (B) InHF (ms2) high frequency, (C) LF (ms2) low frequency, (D) LF/HF (ms2) low frequency/high frequency ratio. Abbreviations: BA, behavioral activation; t, p < 0.05 between groups; a, significantly differ from T0 for within-group comparison

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