Table 1.

Participant’s characteristics

	N	Minimum	Maximum	Average	Median	SD
Age (in years)	28	26	67	49.14	49.0	9.93
BMI (in kg/m²)	28	20.07	30.04	23.97	23.48	2.12
Run time (in hour:min:s)	23	15:25:14	28:57:45	23:09:37	23:30:12	03:57:03
HR in U1	28	50 bpm	109 bpm	72.07bpm	71bpm	11.76 bpm
HR in U2	24	62 bpm	127 bpm	85.75 bpm	80 bpm	15.95 bpm
HR in U3	27	55 bpm	96 bpm	69.48 bpm	69 bpm	8.47 bpm
SDNN U1	26	35.88 ms	208.74 ms	74.81 ms	60.495 ms	38.38 ms
SDNN U2	21	23.89 ms	416.40 ms	81.49 ms	45.35 ms	96.68 ms
SDNN U3	25	34.88 ms	147.8 ms	66.88 ms	59.79 ms	23.64 ms
RMSSD U1	27	26.8 ms	353.7 ms	73.17 ms	40.9 ms	76.65 ms
RMSSD U2	22	24.8 ms	423.5 ms	126.73 ms	96.05 ms	107.93 ms
RMSSD U3	26	25.1 ms	177.4 ms	54.88 ms	45.9 ms	31.97 ms
pNN50 U1	27	1.9%	49.7%	14.80%	7.1%	14.30%
pNN50 U2	22	0.7%	55.6%	17.53%	11.7%	17.71%
pNN50 U3	26	2.6%	25.9%	10.81%	9.4%	7.26%
VQ U1	26	0.23	1.78	0.86	0.855	0.41
VQ U2	21	−1.65	1.78	0.65	0.66	0.81
VQ U3	25	0.38	1.38	0.87	0.85	0.34

BMI, body mass index; bpm, beats per minute; HR, heart rate; N, number of participants with complete data sets; 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; U1, investigation 7 days before the run; U2, investigation immediately after the run; U3, investigation 7 days after the run; VQ, vegetative quotient.