Table 3.
Steady-state accommodation, baseline and end-exercise values for the NIRS-derived ΔHHb, ΔO2Hb, ΔHbtot and TOI signals in Control (CON) and hyperventilation-induced hypocapnic alkalosis (RALK)
| Pre-Accommodation | Post-Accommodation | 20 W Baseline | End-Exercise | |||||
|---|---|---|---|---|---|---|---|---|
| CON | RALK | CON | RALK | CON | RALK | CON | RALK | |
| ΔHHb (μmol l−1) | 0.3 ± 0.7 | 0.4 ± 0.6 | 0.7 ± 0.8 | −0.1 ± 1.1 | −3.2 ± 2.5†‡ | −3.4 ± 2.4†‡ | 3.2 ± 3.6# | 3.0 ± 4.4# |
| ΔO2Hb (μmol l−1) | 0.8 ± 0.3 | 0.7 ± 0.4 | 1.6 ± 0.6 | 1.9 ± 1.4 | 2.5 ± 3.0 | 0.6 ± 4.1* | 1.4 ± 4.3 | −2.1 ± 4.4*‡ |
| ΔHbtot (μmol l−1) | 1.1 ± 0.6 | 1.3 ± 0.5 | 2.2 ± 1.3 | 1.8 ± 1.6 | −0.7 ± 4.3 | −3.2 ± 5.0*†‡ | 4.7 ± 4.5# | 0.8 ± 5.8* |
| TOI | 61.5 ± 5.6 | 61.4 ± 3.7 | 61.3 ± 5.2 | 61.5 ± 2.0 | 65.1 ± 6.4†‡ | 64.2 ± 4.8†‡ | 61.4 ± 5.6# | 59.8 ± 5.0# |
ΔHHb, deoxy-haemoglobin; ΔO2Hb, oxy-haemoglobin; ΔHbtot, total haemoglobin; TOI, tissue oxygenation index. *Significant difference (P < 0.05) from Control. †significant difference (P < 0.05) from Pre-Accommodation; ‡significant difference (P < 0.05) from Post-Accommodation; #significant difference (P < 0.05) from 20 W Baseline.