Visual information without thermal energy may induce thermoregulatory-like cardiovascular responses

Table 1 Overall results of correlation analysis: impression scores of ‘hot-cold’

Indices	Intra-individual correlation coefficients(r)	P value for null hypothesis is that common coefficienta = 0	Significance
ΔHR	+0.190	0.037	^**
ΔSV	+0.008	0.934
ΔCO	+0.229	0.012	^**
ΔSBP	-0.099	0.282
ΔDBP	-0.157	0.085	^*
ΔMBP	-0.163	0.074	^*
ΔTPR	-0.247	0.006	^***
ΔHF	+0.111	0.224
ΔLF	+0.071	0.437
ΔVLF	+0.190	0.036	^**
Thermal sensation	+0.439	<0.0001	^***

Correlation coefficients between each index and ‘hot-cold’ impression scores. Positive correlations mean the hotter the impressions, the greater the indices. ^*P <0.1; ^**P <0.05; ^***P <0.01. The P values are for the common coefficient a, not the results of multiple regression analysis. The raw results of multiple regression analyses are shown in Additional file 2. Changes from baseline: ΔHR, heart rate; ΔSV, stroke volume; ΔCO, cardiac output; ΔSBP, systolic blood pressure; ΔDBP, diastolic blood pressure; ΔMBP, mean blood pressure; ΔTPR, total peripheral resistance; ΔHF, high frequency HRV; ΔLF, low frequency HRV; and ΔVLF, very low frequency of HRV. HRV, heart rate variability.

ISSN: 1880-6805