Table 2.

Influence of low-frequency sound on heart rate variability indices during intervention.

Variable	Time	Intervention	Interaction
	p	p	p
HRInt (beats/min)	0.42	<0.001	>0.99
Ln LFInt (ms2)	0.041	0.19	0.84
Ln HFInt (ms2)	0.35	0.23	>0.99
Ln LF/HFInt	0.20	0.011	0.76

p—significance of ANOVA factors; HR—heart rate; Int—intervention; Ln—natural logarithm; LF—low-frequency power; HF—high-frequency power; LF/HF = LF/HF ratio.