Table 2.
Circadian variation of the reactivity to the exercise stressor
| Variable | P value circadian | P value harmonic | Timing minimum response, ° | Timing maximum response, ° | Amplitude | Amplitude, % |
| Epinephrine | n.s. | 0.039 | 180; 350 | 90; 260 | 14.7 pg/mL | 52.1 |
| Norepinephrine | n.s. | 0.011 | 130; 320 | 40; 230 | 79.5 pg/mL | 34.6 |
| HF | 0.0023 | n.s. | 270 | 60 | 405 s2 | 35.1 |
| pNN50 | 0.0015 | n.s. | 200 | 40 | 6.06% | 20.8 |
| SBP | 0.034 | n.s. | 80 | 300 | 7.23 mmHg | 6.4 |
DBP, HR, aggregability, and platelet count were not significant and thus not shown; cortisol not shown, see text. n.s., not significant.