Heart rate variability (HRV) data
| Control | Non-restrictive | Restrictive | |
| Mean heart rate (beats/min) | 72 (10) | 73 (10) | 77 (10)3-150 |
| HRV index | 32 (10) | 28 (9) | 22 (8)3-160 |
| SDNN (ms) | 114 (40) | 99 (21) | 70 (13)3-160 |
| SDANN (ms) | 89 (26) | 85 (25) | 71 (25)3-160 |
| RMSSD (ms) | 30 (14) | 27 (13) | 23 (11)3-160 |
| CV (%) | 14 (5) | 12 (3) | 9 (2)3-160 |
Values are expressed as mean (SD).
↵3-150 p < 0.05,
↵3-160 p < 0.01 restrictive versus non-restrictive.
CV, coefficients of variance = SD of the NN intervals (SDNN)/mean heart rate; HRV index, HRV triangular index; RMSSD, the square root of the mean of the sum of the squares of differences between adjacent NN intervals; SDANN, SD of the averages of NN intervals in 5 minute segments.