Table 2.
Brachial blood flow, skin blood flow, skin vascular conductance, and SpO2 during experiment.
| Exercise | 3-way interaction | |||||
|---|---|---|---|---|---|---|
| Rest 1 | Rest 2 | 10 min | 20 min | 30 min | P value | |
| Antegrade blood flow (mL·min−1) | ||||||
| Norm 30 | 61.2 ± 7.8 | 55.5 ± 6.0 | 90.6 ± 8.0# | 112.9 ± 6.5# | 127.8 ± 6.3# | P < 0.01 |
| Norm 60 | 56.6 ± 5.5 | 59.6 ± 3.9 | 167.1 ± 11.4 *,# | 316.3 ± 28.8*,# | 403.4 ± 44.0 *,# | |
| Hypo 30 | 60.1 ± 6.8 | 60.4 ± 3.1 | 97.8 ± 6.0# | 123.6 ± 8.9# | 139.9 ± 12.6# | |
| Hypo 60 | 75.1 ± 10.0 | 70.8 ± 7.8 | 164.1 ± 18.2§,# | 270.2 ± 21.5§,# | 315.2 ± 22.2§,‡,# | |
| Retrograde blood flow (mL·min−1) | ||||||
| Norm 30 | 9.2 ± 0.8 | 6.6 ± 0.9 | 22.7 ± 6.8# | 26.4 ± 6.7# | 21.2 ± 5.8 | P < 0.01 |
| Norm 60 | 9.0 ± 1.3 | 7.9 ± 1.2 | 41.0 ± 10.3# | 22.2 ± 8.3 | 15.4 ± 7.5 | |
| Hypo 30 | 11.7 ± 2.6 | 15.6 ± 2.5† | 46.9 ± 7.0†,# | 49.2 ± 8.8†,# | 39.8 ± 8.9†,# | |
| Hypo 60 | 9.6 ± 2.3 | 14.0 ± 2.0‡ | 70.7 ± 8.3§,‡,# | 62.5 ± 12.1‡,# | 64.0 ± 12.3§,‡,# | |
| Skin blood flow (mL·min−1·100 g−1) | ||||||
| Norm 30 | 2.2 ± 0.3 | 2.5 ± 0.3 | 4.1 ± 0.8 | 6.2 ± 0.8# | 8.4 ± 1.8# | P = 0.41 |
| Norm 60 | 1.7 ± 0.3 | 2.0 ± 0.4 | 7.1 ± 1.7# | 13.9 ± 2.1*,# | 14.2 ± 2.3# | |
| Hypo 30 | 1.7 ± 0.3 | 1.7 ± 0.2 | 1.8 ± 0.3 | 2.7 ± 0.6 | 2.8 ± 0.7†,# | |
| Hypo 60 | 1.7 ± 0.2 | 1.9 ± 0.2 | 5.3 ± 1.5 | 12.5 ± 1.4§,# | 12.5 ± 1.3§,# | |
| Skin vascular conductance (mL·min−1·100 g−1·mmHg−1) | ||||||
| Norm 30 | 2.6 ± 0.3 | 2.8 ± 0.3 | 4.4 ± 0.8 | 6.7 ± 0.8# | 10.0 ± 2.1# | P = 0.17 |
| Norm 60 | 2.1 ± 0.4 | 2.2 ± 0.4 | 6.4 ± 1.5# | 12.6 ± 2.0# | 13.0 ± 2.0# | |
| Hypo 30 | 1.9 ± 0.3 | 1.9 ± 0.3 | 2.1 ± 0.3 | 3.1 ± 0.7# | 3.2 ± 0.8†,# | |
| Hypo 60 | 2.0 ± 0.2 | 2.3 ± 0.4 | 5.0 ± 1.5 | 12.6 ± 1.6§,# | 12.7 ± 1.5§,# | |
| SpO2 (%) | ||||||
| Norm 30 | 97.7 ± 0.2 | 97.8 ± 0.2 | 97.9 ± 0.2 | 97.5 ± 0.2 | 97.5 ± 0.1 | P = 0.54 |
| Norm 60 | 98.1 ± 0.3 | 98.1 ± 0.3 | 97.1 ± 0.4*,# | 96.8 ± 0.3# | 96.6 ± 0.4# | |
| Hypo 30 | 97.7 ± 0.3 | 86.5 ± 1.7†,# | 73.7 ± 1.4†,# | 73.8 ± 1.1†,# | 72.5 ± 1.5†,# | |
| Hypo 60 | 97.7 ± 0.2 | 84.8 ± 0.9‡,# | 70.0 ± 1.6‡,# | 69.8 ± 1.8‡,# | 69.9 ± 1.5‡,# | |
Values expressed as mean ± SE. SpO2, arterial oxygen saturation; Norm 30, 30% 
O2peak in normoxia; Norm 60, 60% 
O2peak in normoxia; Hypo 30, 30% 
O2peak in hypoxia; Hypo 60, 60% 
O2peak in hypoxia.
*
P < 0.05 Norm 30 versus Norm 60
§
P < 0.05 Hypo 30 versus Hypo 60
†
P < 0.05 Norm 30 versus Hypo 30
‡
P < 0.05 Norm 60 versus Hypo 60
#
P < 0.05 versus Rest 1 in each trial.