Table 4.

Mutually adjusted associations of sedentary time, physical activity, and cardiorespiratory fitness with heart rate variability variables

	SDNN			RMSSD			LF			HF			LF/HF
	β	95% CI	p	β	95% CI	p	β	95% CI	p	β	95% CI	p	β	95% CI	p
Boys
ST	0.088	− 0.16|0.34	0.474	0.117	− 0.12|0.36	0.333	0.005	− 0.25|0.26	0.966	0.142	− 0.10|0.39	0.248	− 0.227	− 0.48|0.02	0.066
PAEE	0.220	− 0.04|0.49	0.097	0.259	0.004|0.52	0.046	0.153	− 0.12|0.43	0.261	0.232	− 0.03|0.50	0.078	− 0.204	− 0.47|0.06	0.124
CRF	0.231	0.08|0.38	0.004	0.270	0.12|0.42	0.001	0.169	0.010|0.33	0.038	0.232	0.08|0.38	0.003	− 0.184	− 0.34|− 0.03	0.020
Girls
ST	− 0.301	− 0.56|− 0.06	0.015	− 0.279	− 0.53|− 0.04	0.022	− 0.338	− 0.60|− 0.09	0.008	− 0.269	− 0.53|− 0.03	0.031	0.041	− 0.21|0.30	0.743
PAEE	0.101	− 0.15|0.36	0.420	0.120	− 0.13|0.37	0.334	0.011	− 0.25|0.27	0.930	0.112	− 0.14|0.37	0.376	− 0.170	− 0.43|0.09	0.190
CRF	0.035	− 0.12|0.19	0.646	0.084	− 0.07|0.23	0.267	− 0.018	− 0.17|0.14	0.815	0.072	− 0.08|0.22	0.348	− 0.140	− 0.29|0.02	0.077

Values are standardized regression coefficients (β), 95% confidence intervals (CI), and p values from linear regression analyses in which ST, PAEE, and CRF were entered simultaneously with years from peak height velocity, body fat percentage, and cardiometabolic risk score into the models. P values < 0.05 indicating statistically significant associations are in bold

ST sedentary time, PA physical activity, CRF cardiorespiratory fitness, SDNN standard deviation of all RR intervals, RMSSD root mean square of successive RR interval differences, LF low-frequency power, HF high-frequency power, PAEE PA energy expenditure