Table 2.
Comparison of vital signs during each study phase (see text for details)
| Variable | HF30-T31 (N = 40) |
HF60-T31 (N = 40) |
HF30-T37 (N = 40) |
HF60-T37 (N = 40) |
p value, GLIMMIX |
|---|---|---|---|---|---|
| Systolic arterial pressure (mmHg) | 122 (112–136) | 121 (109–135) | 124 (109–138) | 120 (111–135) | 0.854 |
| Diastolic arterial pressure (mmHg) | 64 (59–70) | 63 (56–70) | 65 (53–70) | 65 (60–70) | 0.731 |
| Heart rate (bpm) | 88 ± 15 | 87 ± 15 | 90 ± 15‡ | 89 ± 15 | 0.02** |
| SpO2 (%) | 96 (94–99) | 98 (96–100)† | 96 (95–99)§ | 98 (96–99)†|| | < 0.0001** |
| Respiratory rate (bpm) | 22 (18–29) | 22 (19–25) | 23 (19–29) | 23 (19–26) | 0.174 |
| Borg scale | 3 (2–5) | 3 (1–5) | 4 (2–5) | 3 (2–5) | 0.557 |
| SpO2/FiO2 | 238 (192–246) | 240 (196–248)† | 240 (190–248)‡ | 240 (196–248)* | < 0.001** |
FiO2 inspired oxygen fraction, GLIMMIX generalized linear mixed model, HF30-T31 gas flow 30 l/min and temperature 31 °C, HF60-T31 gas flow 60 l/min and temperature 31 °C, HF30-T37 gas flow 30 l/min and temperature 37 °C, HF60-T37 gas flow 60 l/min and temperature 37 °C, SpO2 peripheral oxygen saturation
Post hoc comparisons: *p < 0.01 vs HF30-T31; †p < 0.001 vs HF30-T31; ‡p < 0.05 vs HF60-T31; §p < 0.001 vs HF60-T31; ||p < 0.001 vs HF30-T37
**Data significant at p < 0.05