Local alternating heat and cold stimulation affects hemodynamics and oxygenation in fatigued muscle tissue and autonomic nervous activity: a single-arm interventional study

Table 3 Correlations between changes in NIRS and HRV parameters

	ΔOxyHb		ΔDeoxyHb		ΔTotalHb		TOI
	Correlation coefficient	p-value	Correlation coefficient	p-value	Correlation coefficient	p-value	Correlation coefficient	p-value
HF	0.02a	0.79	0.084a	0.724	0.015a	0.950	− 0.308a	0.186
LF	0.177a	0.454	− 0.041a	0.85	− 0.093a	0.696	0.116a	0.627
LF/HF	0.309b	0.185	− 0.322a	0.166	0.088b	0.713	0.499b	0.025
CVRR	0.252b	0.283	− 0.260a	0.268	0.124b	0.603	0.375b	0.103

Correlation analysis was performed between the changes in each participant’s post-intervention and pre-intervention values
NIRS near-infrared spectroscopy, HRV heart rate variability, OxyHB oxyhemoglobin, DeoxyHB deoxyhemoglobin, TotalHb total hemoglobin, TOI tissue oxygenation index, HF high frequency, LF low frequency, CVRR coefficient of variation of R-R interval
^aSpearman’s correlation coefficient
^bPearson’s correlation coefficient

ISSN: 1880-6805