Table 2.
6-MWT differences with or without a surgical or N95 face mask
| Surgical Facemask (n = 36) |
N95 Facemask (n = 41) |
|||
|---|---|---|---|---|
| With Face Mask | Without Face Mask | With Face Mask | Without Face Mask | |
| 6-MWD, m | 516.2 ± 77.8 | 517.6 ± 90.6 | 535.5 ± 78.9 | 537 ± 73.6 |
| 6-MWD, % of predicted | 86.7 ± 18.8 | 86.5 ± 16.5 | 88.6 ± 17 | 88.5 ± 17.2 |
| Basal SpO2, % | 92.4 ± 1.6 | 93 ± 1.9 | 93 ± 1.6 | 93 ± 1.8 |
| Lowest SpO2, % | 88.2 ± 3.2 | 88.3 ± 3.5 | 87.8 ± 3.9 | 87.5 ± 4.1 |
| Final SpO2, % | 90.3 ± 3.5 | 90.5 ± 3.7 | 89.4 ± 4.3 | 89.4 ± 4.3 |
| 1-min SpO2, % | 92.6 ± 2.8 | 93.1 ± 2.1 | 91.8 ± 3.3 | 92.1 ± 2.9 |
| 3-min SpO2, % | 93.3 ± 1.8 | 93.5 ± 1.6 | 94 ± 1.5 | 93.6 ± 1.7 |
| Basal HR, bpm | 83 ± 12 | 83 ± 12 | 82 ± 13 | 82 ± 14 |
| Highest HR, bpm | 122 ± 15 | 123 ± 16 | 124 ± 16 | 123 ± 13 |
| Final HR, bpm | 114 ± 19 | 116 ± 18 | 121 ± 17 | 118 ± 17 |
| 1-min HR, bpm | 98.1 ± 17.6 | 95.7 ± 16.7 | 101.1 ± 17.6 | 100.8 ± 18.5 |
| 3-min HR, bpm | 91.5 ± 14.2 | 91.6 ± 15.5 | 92.6 ± 14.2 | 92.4 ± 14.7 |
| Dyspnea basal score | 0.2 ± 0.7 | 0.3 ± 0.7 | 0.3 ± 0.4 | 0.3 ± 0.6 |
| Dyspnea final score | 1.2 ± 1.2 | 1.0 ± 1.1 | 1.8 ± 1.5 | 1.2 ± 1.4 |
| Dyspnea 1-min score | 1 ± 1.1 | 0.9 ± 1 | 1.3 ± 1.2 | 1 ± 1.2 |
| Dyspnea 3-min score | 0.6 ± 0.8 | 0.5 ± 0.8 | 0.7 ± 0.7 | 0.5 ± 0.7 |
| Fatigue basal score | 0.6 ± 1.0 | 0.6 ± 1.3 | 0.6 ± 1.0 | 0.6 ± 1.0 |
| Fatigue final score | 1.8 ± 2.2 | 1.8 ± 1.2 | 2.4 ± 2.0 | 2.3 ± 2.0 |
| Fatigue 1-min score | 1.6 ± 1.9 | 1.7 ± 2.1 | 2.1 ± 1.5 | 1.8 ± 1.7 |
| Fatigue 3-min score | 1.1 ± 1.8 | 1.1 ± 1.9 | 1.3 ± 1.2 | 1.3 ± 1.4 |
Definition of abbreviations: 6-MWD = 6-minute walking distance; 6-MWT = 6-minute walking test; HR = heart rate; SpO2 = oxygen saturation measured by pulse-oximeter.
Data are presented in mean ± SD. The 1-minute and 3-minute scores correspond with measurements at 1 minute and 3 minutes after the 6-MWT. The dyspnea and fatigue scores were measured with the Borg Scale (8). The 6-MWD% predicted is the percentage predicted of the 6-MWD according to Enright and Sherrill (9). All parameters P > 0.05 between with and without the face mask according to the type of face mask (analysis of variance).