Table 5 HRV analysis data before and after exercise training*
 Pretraining Post-training Group A Group B Group A Group B SDNN (ms) 92.2 (19.9)† (40–120) 127.1 (12.6) (101–144) 109.5 (19.9)†,‡ (68–139) 144.7 (19.3)‡ (111–184) rMSSd (ms) 13.4 (4.0)† (7–19) 19.7 (5.4) (12–29) 18.1 (5.2)†,‡ (9–31) 22.7 (7.4)‡ (11–37) pNN50 (%) 0.5 (0.7)† (0–2) 2.8 (3.0) (0–10) 2.5 (3.1)‡ (0–13) 4.7 (4.5)‡ (0–15) LF (ms2) 259.4 (156.9)† (5.2–569.7) 519.0 (265.9) (265.8–1152.8) 382.7 (208.0)†,‡ (42.6–868.3) 607.2 (357.8) (121.5–1474.5) HF (ms2) 56.6 (38.5)† (3.8–129.3) 108.2 (67.1) (26.1–249.6) 94.5 (51.2)‡ (10.3–210.9) 136.7 (95.5) (21.9–414.9) LF (n.u.) 79.8 (10.6) 85.2 (15.7) 76.0 (5.8) 77.9 (7.7)‡ HF (n.u.) 17.9 (6.6) 16.6 (6.8) 19.5 (6.5) 18.1 (7.0) LF:HF ratio 5.0 (2.0) (1.4–10.3) 6.1 (3.3) (2.3–12.8) 4.4 (1.6) (1.9–7.5) 5.2 (2.4)‡ (2.0–9.2)
• *Values given are the mean (SD) and range where applicable.

• †p<0.05 group A versus B.

• ‡p<0.05 pretraining versus post-training.

• HF, high-frequency power; LF, low-frequency power; n.u., normalized units; pNN50, percentage of differences between adjacent filtered RR intervals which was greater than 50 ms for the entire analysis; rMSSd, square root of the average of sum of squares of difference between adjacent filtered RR intervals; SDNN, SD of all normal-to-normal RR intervals in the entire recording.