Table 1. Participant characteristics at pre and post 4 weeks of either sprint interval (SIT) or sprint continuous training (SCT).
| SIT (n = 6) | SCT (n = 6) | |||
| PRE | POST | PRE | POST | |
| Body mass index (kg·m−2) | 23.6±1.8 | 23.8±1.6 | 23.1±2.3 | 22.9±2.6 |
| Resting heart rate (bpm) | 55±10 | 56±6 | 62±8 | 64±12 |
| Brachial artery SBP | 115±7 | 117±11 | 112±12 | 111±11 |
| Brachial artery DBP | 73±5 | 72±11 | 76±9 | 72±7 |
| Brachial artery MAP | 87±5 | 87±10 | 88±10 | 85±8 |
Absolute  (L·min−1)*
|
2.34±0.37 | 2.55±0.31 | 2.24±0.22 | 2.30±0.21 |
| RI test duration (min)* | 12.14±1.74 | 13.44±1.55 | 12.06±1.18 | 12.73±0.9 |
| Lactate threshold (%) | 48.4±7.4 | 46.4±5.4 | 49.0±6.4 | 51.9±8.1 |
| Peak reactive hyperaemia (cm·s−1) | 98.8±23.6 | 97.3±19.4 | 82.0±14.7 | 90.1±8.7 |
| Peak shear rate (s−1) | 2629±1064 | 2564±803 | 2126±449 | 2395±301 |
| AUCpeak (a.u.) | 31325±11174 | 30406±13875 | 27646±6595 | 31396±6366 |
| AUC60 (a.u.) | 39815±14654 | 39648±16146 | 39596±5261 | 43901±6012 |
| Insonation angle (°) | 69±1 | 68±2 | 68±2 | 68±1 |
| Brachial artery baseline diameter (mm) | 3.2±0.8 | 3.2±0.8 | 3.1±0.5 | 3.1±0.5 |
| Absolute FMD (mm) | 0.15±0.09 | 0.18±0.07 | 0.22±0.08 | 0.20±0.08 |
| Time from cuff release to peak diameter (s) | 38±8 | 35±4 | 34±9 | 34±6 |
| CAC adhesion per microscopic image (SIT: n = 6; SCT: n = 5) | 11±8 | 8±6 | 13±8 | 11±12 |
| CAC migration per 10 microscopic images (SIT: n = 5; SCT: n = 5) | 2±3 | 4±7 | 1±4 | 2±2 |
* indicates a significant main time effect (p<0.05).
No group differences at baseline or group x time interactions were observed (p>0.05). Absolute FMD group x time interaction was close to significant (p = 0.08). RI test duration group x time interaction was close to significant (p = 0.05). Bpm = beats per minute, SBP = systolic blood pressure, DBP = diastolic blood pressure, MAP = mean arterial pressure, 
= maximal oxygen uptake, RI = ramp incremental, AUC = area under the shear rate curve, FMD = flow-mediated dilation and CAC = circulating angiogenic cell.