Changes in heart rate variability with respect to exercise intensity and time during treadmill running

Table 2 Power in the ULF and VLF frequency bands: time dependence at moderate and vigorous intensities (see also Fig. 3c–f)

	\(w_1\)	\(w_2\)	\(w_3\)	overall p-value	p-values, paired comparisons
	\(w_1\)	\(w_2\)	\(w_3\)	overall p-value	\(w_1\) vs. \(w_2\)	\(w_1\) vs. \(w_3\)	\(w_2\) vs. \(w_3\)
m
ULF	\(0.85 \pm 0.48\)	\(0.50 \pm 0.57\)	\(0.20 \pm 0.53\)	< 0.001	0.031	0.001	0.255
VLF	\(1.87 \pm 0.19\)	\(1.80 \pm 0.35\)	\(1.74 \pm 0.27\)	0.041	0.778	0.007	0.704
v
ULF	\(0.30 \pm 0.59\)	\(0.13 \pm 0.36\)	\(-\,0.12 \pm 0.60\)	0.12	−	−	−
VLF	\(1.57 \pm 0.32\)	\(1.31 \pm 0.32\)	\(1.22 \pm 0.33\)	< 0.001	0.001	\(<0.001\)	0.292

\(n = 18\) (m); \(n = 15\) (v)
Values are mean ± standard deviation, given as \(\log _{10}([\text {power}/(\text {ms}^2)]/[1/(\text {ms}^2)])\)
\(w_1\) first window, \(w_2\) second window, \(w_3\) third window, m moderate, v vigorous, ULF ultra-low frequency, VLF very-low frequency
Paired comparisons: p-values adjusted using Bonferroni correction (presented only where overall p-value \(< 0.05\))

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