. 2021 May 31;18(11):5934. doi: 10.3390/ijerph18115934

Table 2.

Differences on heart rate variability depending on ambient temperature in experimental and control groups during first 5 minutes of measurement.

							ANOVA (F, p, η²_p)
		19 °C		35 °C EG 19 °C CG			Temperature Effect			Group Effect			Group*Temperature Effect
Outcome	Group	M	SD	M	SD	p	F	p	η ² _p	F	p	η ² _p	F	p	η ² _p
RR	EG	1066.44	184.00	876.17	326.35	0.004	13.157	0.002	0.409	0.015	0.905	0.001	3.848	0.065	0.168
RR	CG	982.28	177.69	996.61	159.77	1	13.157	0.002	0.409	0.015	0.905	0.001	3.848	0.065	0.168
SDNN	EG	75.43	21.80	64.25	20.73	0.333	0.025	0.876	0.001	1.224	0.282	0.061	2.34	0.143	0.11
SDNN	CG	71.43	21.13	73.90	21.54	0.258	0.025	0.876	0.001	1.224	0.282	0.061	2.34	0.143	0.11
RMSSD	EG	76.14	28.92	52.85	29.46	0.096	0.38	0.545	0.2	0.087	0.771	0.005	3.255	0.087	0.146
RMSSD	CG	60.74	22.37	61.18	26.74	0.422	0.38	0.545	0.2	0.087	0.771	0.005	3.255	0.087	0.146
pNN50	EG	45.74	18.90	28.43	22.26	0.021	2.338	0.143	0.11	0.612	0.444	0.031	3.72	0.069	0.164
pNN50	CG	38.76	17.20	37.35	27.75	0.785	2.338	0.143	0.11	0.612	0.444	0.031	3.72	0.069	0.164
LF_ln (ms²)	EG	7.14	0.66	6.95	0.70	0.449	0.051	0.824	0.003	0.06	0.81	0.003	1.671	0.212	0.081
LF_ln (ms²)	CG	6.89	0.77	6.85	0.84	0.307	0.051	0.824	0.003	0.06	0.81	0.003	1.671	0.212	0.081
LF_nu	EG	44.35	21.43	52.60	18.58	0.049	0.7	0.413	0.036	1.154	0.296	0.057	3.593	0.073	0.159
LF_nu	CG	56.49	17.60	50.97	21.68	0.473	0.7	0.413	0.036	1.154	0.296	0.057	3.593	0.073	0.159
HF_ln (ms²)	EG	7.4	0.75	6.82	0.89	0.032	0.179	0.677	0.009	1.495	0.236	0.073	4.034	0.059	0.175
HF_ln (ms²)	CG	6.67	0.89	6.72	1.38	0.287	0.179	0.677	0.009	1.495	0.236	0.073	4.034	0.059	0.175
HF_nu	EG	55.63	21.44	47.20	18.36	0.049	0.782	0.388	0.04	1.172	0.293	0.058	3.68	0.07	0.162
HF_nu	CG	43.38	17.60	48.90	21.69	0.484	0.782	0.388	0.04	1.172	0.293	0.058	3.68	0.07	0.162
TP_ln	EG	8.38	0.50	8.06	0.61	0.233	0.001	0.98	<0.001	0.007	0.932	<0.001	2.981	0.1	0.136
TP_ln	CG	6.64	1.79	6.51	1.55	0.241	0.001	0.98	<0.001	0.007	0.932	<0.001	2.981	0.1	0.136
LF/HF	EG	1.30	1.72	1.68	1.95	0.281	0.985	0.333	0.049	0.214	0.649	0.011	0.292	0.595	0.015
LF/HF	CG	1.94	0.59	1.53	0.57	0.758	0.985	0.333	0.049	0.214	0.649	0.011	0.292	0.595	0.015
SD1	EG	53.95	20.48	40.20	18.62	0.095	0.380	0.545	0.02	0.086	0.773	0.004	3.268	0.087	0.147
SD1	CG	43.04	15.85	49.00	37.37	0.421	0.380	0.545	0.02	0.086	0.773	0.004	3.268	0.087	0.147
SD2	EG	91.08	26.65	81.07	24.30	0.491	0.15	0.703	0.008	1.665	0.212	0.081	1.842	0.191	0.088
SD2	CG	91.46	29.72	89.93	22.93	0.243	0.15	0.703	0.008	1.665	0.212	0.081	1.842	0.191	0.088
SD2/SD1	EG	1.82	0.58	2.19	0.59	0.04	3.153	0.092	0.142	1.503	0.235	0.073	1.597	0.222	0.078
SD2/SD1	CG	2.96	2.09	2.21	0.69	0.728	3.153	0.092	0.142	1.503	0.235	0.073	1.597	0.222	0.078
SS	EG	10.97	2.62	13.32	3.83	0.187	0.511	0.483	0.026	0.91	0.352	0.046	1.375	0.255	0.067
SS	CG	13.28	3.34	12.92	3.81	0.755	0.511	0.483	0.026	0.91	0.352	0.046	1.375	0.255	0.067
S/PS	EG	0.23	0.12	0.43	0.27	0.045	1.852	0.189	0.089	0.052	0.822	0.003	2.566	0.126	0.119
S/PS	CG	0.32	0.30	0.50	0.42	0.87	1.852	0.189	0.089	0.052	0.822	0.003	2.566	0.126	0.119

HR: Heart rate; SDNN: Standard deviation of consecutive R-R intervals; pNN50: relative value of consecutive intervals that differ by more than 50 ms; RMSSD: root mean square of successive differences of consecutive R-R intervals; HF_ln: High-frequency power based on its natural logarithm; LF_ln: Low-frequency power based on its natural logarithm; HF_nu: High-frequency power in normalized units; HF_nu: High-frequency power in normalized units; LF/HF: Ratio between low-and high-frequency power; SD1: the standard deviation of instantaneous beat-to-beat interval variability; SD2: continuous long-term R/R interval variability; SS: Stress Score; S/PS: sympathetic-parasympathetic ratio.