Table 2.
Baselines cardiovascular values
| Healthy participants | Concussed athletes | P value | |
|---|---|---|---|
| Heart rate (bpm) | 61 ± 12 | 57 ± 12 | 0.689 |
| R‐R interval (msec) | 1022 ± 197 | 1009 ± 168 | 0.877 |
| RMSSD (msec) | 101 ± 83 | 108 ± 99 | 0.867 |
| High frequency (msec2) | 2294 ± 2314 | 2459 ± 2058 | 0.864 |
| Stroke volume (mL) | 106 ± 24 | 105 ± 27 | 0.902 |
| Cardiac output (L/min) | 6.1 ± 1.6 | 6.3 ± 1.6 | 0.768 |
| Mean arterial pressure (mmHg) | 94 ± 10 | 96 ± 13 | 0.737 |
| Systolic blood pressure (mmHg) | 129 ± 16 | 135 ± 16 | 0.407 |
| Diastolic blood pressure (mmHg) | 74 ± 8 | 74 ± 11 | 0.876 |
| Total peripheral resistance (mmHg/L per min) | 16.4 ± 7.4 | 16.5 ± 4.3 | 0.981 |
Values are means ± SD. RMSSD = root mean square of successive differences in R‐R interval. Baseline values were compared between groups using unpaired t‐tests.