Table 4.

Multiple linear regression—dependent variable SDNN U3

	Regression coefficient	SE	Beta	T-value	Sig.
Constant	−4.306	21.842		−0.197	0.847
Age	0.042	0.211	0.017	0.198	0.846
BMI	0.688	0.964	0.068	0.714	0.488
Running time	0.000	0.000	−0.014	−0.143	0.889
HR	0.128	0.152	0.071	0.842	0.415
SDNN U1	0.612	0.050	0.990	12.365	0.000
RMSSD U1	0.302	0.028	0.969	10.872	0.000
pNN50 U1	1.800	0.344	0.968	5.228	0.000

Dependence on age, BMI, running time and HR for recovery values.

BMI, body mass index; HR, heart rate; pNN50, the percentage of pairs of RR intervals that are more than 50 ms apart; RMSSD, root mean square of successive differences; SDNN, the SD of all normal RR intervals; Sig., significance level; U1, investigation 7 days before the run; U3, investigation 7 days after the run.