Table 4 Relationship of cardiac autonomic modulation with physical activity at leisure time/commuting domain and in total among Brazilian adults (n = 252).

	β	Leisure time/commuting PA							β	Total PA
		Unadjusted			β	Adjusted*				Unadjusted			β	Adjusted*
		95%CI	Adj.R²	p-value	β	95%CI	Adj.R²	p-value		95%CI	Adj.R²	p-value	β	95%CI	Adj.R²	p-value
SDNN (ms)	4.61^†	1.12–8.11	0.022	0.010	3.36	0.28; 6.70	0.132	0.048	1.67^†	0.20; 3.13	0.016	0.026	1.36	− 0.21; 2.94	0.130	0.090
RMSSD (ms)	5.56	1.71–9.42	0.027	0.005	3.53	0.46; 7.52	0.104	0.043	2.31	0.70; 3.93	0.027	0.005	1.70	0.04; 3.72	0.107	0.045
LF (nu)	− 1.85	− 4.60; 0.90	0.003	0.186	− 1.40	− 4.46; 1.66	0.064	0.367	− 0.29	− 1.44; 0.87	− 0.003	0.627	0.28	− 1.04; 1.61	0.061	0.672
HF (nu)	1.56	− 1.22; 4.34	0.001	0.272	1.10	− 2.02; 4.22	0.054	0.489	0.36	− 0.81; 1.52	− 0.003	0.545	− 0.16	− 1.51; 1.19	0.052	0.811
SD1	3.81	0.79; 3.83	0.022	0.011	2.34	− 0.78; 5.47	0.085	0.141	1.60†	0.37; 2.84	0.022	0.011	1.13	− 0.24; 2.50	0.087	0.106
SD2	5.12†	0.65; 9.60	0.016	0.025	3.88	− 0.88; 8.64	0.115	0.109	1.84	− 0.06; 3.73	0.010	0.058	1.60	− 0.49; 3.69	0.114	0.132

Bold indicates domains that are statistically related to cardiac autonomic modulation.
PA Physical activity, CI Confidence interval, Adj.R² Adjusted R squared, SDNN Standard deviation of the mean of all normal RR intervals, RMSSD Square root of the square mean of the differences between adjacent normal RR intervals in a time interval, LF Low frequency, HF High frequency, SD1 Standard deviation of instantaneous beat-to-beat variability, SD2 Long-term standard deviation of continuous R-R intervals, ms milliseconds, nu normalized units.
*Adjusted by gender, age, socioeconomic level, body mass index.
^†Statistical model with significant interaction between gender × physical activity.

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