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Influence of low-frequency sound on heart rate (a); low-frequency power (b); high-frequency power (c); and low-frequency/high-frequency ratio (d) during intervention lasting 4 × 5 min (Int1 to Int4). Ln—natural logarithm; Sup—placebo supine; Seq—stimulation with amplitude modulation of LFV; Con—constant LFV. The values displayed above the clips are p-values of ANOVA contrasts.
