Table 3.
Deoxyhemoglobin/myoglobin kinetics assessed by near-infrared spectroscopy after submaximal plantar flexion exercise
| HC-FF | PAD-FF | PAD-FF + 100% O2 | HC-RH | PAD-RH | PAD-RH + 100% O2 | |
|---|---|---|---|---|---|---|
| Resting tissue oxygenation index | 64 ± 2 | 58 ± 2* | 62 ± 2 | 65 ± 2 | 63 ± 2 | 64 ± 3 |
| Time delay, s | 6 ± 9 | 24 ± 9* | 15 ± 7 | 3 ± 4 | 24 ± 12* | 17 ± 9 |
| Amplitude | 5 ± 3 | 25 ± 5* | 18 ± 2* | 16 ± 10 | 23 ± 7 | 21 ± 4 |
| τ, s | 49 ± 39 | 140 ± 32* | 84 ± 33 | 14 ± 16 | 173 ± 33* | 98 ± 39 |
| 95% Confidence interval | 14 ± 19 | 9 ± 3 | 8 ± 4 | 0.9 ± 0.5 | 12 ± 3 | 7 ± 4 |
| Mean response time, s | 54 ± 43 | 164 ± 33 | 99 ± 39* | 17 ± 16 | 197 ± 31* | 115 ± 45* |
Values are expressed as means ± SE. HC, healthy control; FF, free flow conditions; PAD, peripheral artery disease; RH, reactive hyperemia; τ, tissue oxygenation index recovery time constant.
*
Significant difference between groups (P < 0.05).