Table 2.
Time domain or frequency domain heart rate variability indices. Data are means (±SE).
| rest | rec1 | rec2 | rec3 | rec4 | rec5 | ||
|---|---|---|---|---|---|---|---|
| Mean RR | M | 1098 (46)* | 688 (38)* | 717 (38)* | 737 (36)* | 763 (37)* | 794 (38)* |
| C | 833 (33) | 604 (14) | 624 (13) | 641 (12) | 654 (14) | 659 (12) | |
| SDRR | M | 108.2 (10.7)* | 13.5 (1.8) | 13.2 (1.3) | 16.7 (4.0) | 18.5 (3.6) | 19.7 (2.5) |
| C | 56.3 (8.8) | 15.5 (1.6) | 17.1 (2.8) | 16.0 (1.8) | 19.4 (2.9) | 20.6 (3.1) | |
| LF | M | 812.6 (12.0) | 30.8 (8.6) | 44.4 (12.7) | 80.6 (44.7) | 90.6 (47.9) | 156.4 (62.2) |
| C | 517.8 (140.5) | 42.7(10.0) | 55.4 (11.1) | 98.5 (20.0) | 96.1 (39.6) | 126.1 (27.6) | |
| HF | M | 654.3 (136.6)* | 9.9 (3.8) | 16.2 (5.1) | 25.7 (10.1) | 36.1 (15.1) | 45.5 (14.7) |
| C | 218.3 (64.2) | 9.5 (1.7) | 13.6 (2.1) | 17.9 (2.4) | 16.5 (3.5) | 26.7 (4.5) | |
| LF/HF | M | .9 (.3)* | 4.5 (1.1) | 4.2 (1.0) | 3.6 (1.1) | 3.5 (1.0) | 2.9 (.8) |
| C | 2.5 (.3) | 5.4 (1.6) | 5.4 (1.2) | 5.5 (1.1) | 5.2 (1.3) | 4.9 (1.5) |
Abbreviations: M = marathon runners; C = untrained controls.
*Significantly different from C group (p < 0.05). Rest, rec1, rec2, rec3, rec4, rec5: for a more detailed description, see Methods.