Table 1 Measures of HRV before (baseline) and after short-term submaximal exercise (post-exercise) in different body positions. Data are means (±SD).
|
Seated |
|
Supine |
|
Supine with elevated legs |
|
baseline |
post-exercise |
baseline |
post-exercise |
baseline |
post-exercise |
| HR (bpm) |
88 (8) |
97 (6) ** |
76 (10) † † |
84 (8) **§§ |
77 (8) † † |
82 (4) **§§ |
| HRV Time domain |
| RRNN (ms) |
684.4 (60.0) |
624.1 (42.8) ** |
805.0 (112.4) † † |
717.3 (59.8) **§§ |
788.5 (84.2) † † |
732.0 (36.3) **§§ |
| SDNN (ms) |
48.8 (11.8) |
35.6 (12.1) ** |
62.0 (19.5) † † |
40.3 (12.5) ** |
53.0 (15.1) |
37.0 (9.3) ** |
| RMSSD (ms) |
26.1 (8.1) |
16.0 (6.5) ** |
48.6 (22.8) † † |
21.9 (9.0) **§§ |
39.3 (15.8) † † |
22.2 (7.9) **§§ |
| HRV Frequency domain |
| lnLF (ms2) |
7.28 (.59) |
6.82 (.79) * |
7.18 (.53) |
6.55 (.66) ** |
6.87 (.61) † |
6.31 (.68) **§ |
| lnHF (ms2) |
6.15 (.71) |
5.23 (.80) ** |
6.92 (.71) † † |
5.57 (.64) ** |
6.59 (.80) † |
5.55 (.85) ** |
HR, heart rate; RRNN, mean RR normal-to-normal interval; SDNN, standard deviation of normal-to-normal intervals; RMSSD, root mean square of successive differences; ln LF, natural logarithm of low-frequency spectral power; ln HF, natural logarithm of high-frequency spectral power.* and ** denote p < 0.05 and 0.01, respectively, post-exercise vs. baseline† and † † denote p < 0.05 and 0.01, respectively, vs. seated baseline§ and §§ denote p < 0.05 and 0.01, respectively, vs. seated post-exercise.
