Table 2. Backpack carrying modified lung function at rest and cardio-respiratory variables while walking in the CF group.
| Central values | Mean differences | |||||
|---|---|---|---|---|---|---|
| NB | BB | UB | NB vs BB 95% CI |
NB vs UB 95% CI |
BB vs UB 95% CI |
|
| FVC L | 2,37 (2,62) | 2,24 (2,53) | 2,30 (2,30) | NA | NA | NA |
| FVC % | 72.1 (±24.3) | 69.5 (±21.5) | 68.5 (±23.3)* | -2.6 [-5.9 to 0.6] | -3.6 [-6.9 to -0.4] | -1 [-4.3 to 2.3] |
| FEV1 L | 1,90 (2,09) | 1,84 (2,08) | 1,67 (1,93)* § | NA | NA | NA |
| FEV1% | 66.6 (±23.7) | 64.5 (±23.1) | 59.9 (±21.8)*§ | -2.1 [-5.4 to 1.1] | -6.7 [-10 to -3.5] | -4.6 [-7.8 to 1.3] |
| PEF L/min | 4.2 (±2.0) | 4.1 (±2.0) | 3.9 (±2.2) | -0.1 [-0.5 to 0.4] | -0.4 [-0.9 to 0.1] | -0.3 [-0.8 to 0.2] |
| MIP cmH2O | 93.6 (±34.3) | 91.3 (±38.2) | 81.0 (±31.4)* | -2.4 [-14.9 to 9.9] | -12.6 [-25 to -0.4] | -10.3 [-22.5 to 2] |
| MEP cmH2O | 110.8 (±33.6) | 99.3 (±32.2) | 93.4 (±23.3)* | -11.5 [-28.1 to 5.1] | -17.4 [-34 to -0.8] | -5.9 [-22.4 to 10.7] |
| MV L/min | 19.7 (±6.3) | 21.4 (±6.6) ε | 23.3 (±6.8)*§ | +1.7 [0.0 to 3.3] | +3.6 [2 to 5.3] | +2 [0.3 to 3.6] |
| Dyspnea Borg | 0.5 (0) | 1.0 (1.0) | 3.0 (2.0)* | NA | NA | NA |
| RR cpm | 19.6 (3.8) | 20.6 (8.0) | 22.5 (9.9)* | NA | NA | NA |
| VO2 mL/min | 622.5 (±237.4) | 658.4 (±234) ε | 708.2 (±245) *§ | +35.9 [10.3 to 61.5] | +85.7 [60.1 to 111] | +49.8 [24.2 to 75.4] |
| VCO2 mL/min | 404.9 (±191.4) | 435.7 (±190) | 465.9 (±202)* | +30.7 [-23 to 84.5] | +61 [7.3 to 114.7] | +30.3 [-23.4 to 84] |
Abbreviations: BB: bilateral backpack carrying; FEV1: forced expiratory volume in 1 second; FVC: forced vital capacity; MEP: maximal expiratory pressure; MIP: maximal inspiratory pressure; MV: minute ventilation; NB: no backpack carrying; PEF: peak expiratory flow; RR: respiratory rate; UB: unilateral backpack carrying; VCO2: carbon dioxide production; VO2: oxygen consumption. Central values are expressed as mean (±SD) or median (IQR) and mean differences (when applicable) between backpack carrying positions are expressed as Mean [95% CI]
* indicates a statistically significant difference between NB and UB with p<0.05
§ indicates a statistically significant difference between BB and UB with p<0.05
ε indicates a statistically significant difference between NB and BB with p<0.05. All these p-values are indicated for post-hoc analyses after multiple analysis of variance (MANOVA).