Table 4.

Influence of expert status and age on HRV metrics.

		EXPERT		AGE
	model significance (p)	T	p	T	p
HRV METRICS
Time Domain
Mean RR	<0.001**	−4.36	<0.001**	6,12	<0.001**
Median RR	<0.001**	−4.22	<0.001**	5.80	<0.001**
Mean HR	<0.001**	3.34	0.001*	−5.21	<0.001**
SDNN	0.733	−0.47	0.638	0,76	0.447
RMSSD	0.093	−1.85	0.067	0.71	0.480
NN50	0.027*	−1.79	0.076	0.12	0.904
pNN50	0.020*	−2.56	0.012*	1.24	0.218
Frequency Domain
VLF %	0.021*	1.38	0.172	0.46	0.649
LF %	0.400	−0.41	0.683	−0.48	0.630
HF %	<0.001**	−3.41	0.001*	0.07	0.944
LF/HF	<0.001**	2.83	0.006*	−0.03	0.978
LF n.u.	0.005*	2.67	0.009*	−0.81	0.418
HF n.u.	0.005*	−2.67	0.009*	0.81	0.418
VLF abs.	0.289	0.02	0.987	0.97	0.334
LF abs.	0.699	−0.60	0.548	0.10	0.918
HF abs.	0.062	−1.20	0.734	−0.35	0.729

Table 4 presents the influence and significance of linear multivariate regression analysis comparing the influence of expert status and age on HRV metrics. Abbreviations: Expert, comparison between experts and beginners; T, regression coefficient of the respective t-tests; p. significance; *, p < 0.005, **, p < 0.001; SD, standard deviation; HRV, heart rate variability; RR, distance between two subsequent R peaks, SDNN, Standard deviation of normal-to-normal RR- intervals; RMSSD, Square root of the mean squared differences between successive RR-intervals; NN50, Number of successive RR-interval pairs that differ more than 50 ms; pNN50, NN50 divided by the total number of RR-intervals; VLF, Very low frequency (0–0.04 Hz); LF, Low frequency (0.04–0.15 Hz); HF, High frequency (0.15–0.4 Hz), VLF, LF and HF powers [%],Relative powers of VLF, LF and HF bands; LF/HF, ratio between HF and LF band power; LF and HF [n.u.], Powers of LF and HF bands in normalized units; VLF, LF, and HF abs., absolute powers of VLF, LF, and HF bands