Table 3. Backpack carrying induced modifications on lung function at rest and cardio-respiratory adjustments while walking in healthy 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 | 3.42 (0.77) | 3.36 (0.73) | 3.33 (0.72)* | NA | NA | NA |
| FVC % | 99.76 (±14.1) | 96.5(±16.3) | 95.9 (±16.3)* | -3.26 [-6.2 to 0.01] |
-3.83 [-6.7 to -0.1] |
-0.56 [-3.4 to 2.3] |
| FEV1 L | 2.89 (0.70) | 2.84 (0.71) | 2.81 (0.74) | NA | NA | NA |
| FEV1% | 100.5 (±12.74) | 98.53 (±14.92) | 97.85 (±13.48)* | -1.9 [-4.1 to 0.3] |
-2.6 [-4.8 to -0.4] |
-0.7 [-2.9 to 1.5] |
| PEF L/min | 5.56 (±0.99) | 5.52 (±1.07) | 5.23 (±0.97) | 0.0 [-0.4 to 0.3] |
-0.3 [-0.7 to 0.1] |
-0.3 [-0.6 to 0.1] |
| MIP cmH2O | 109.3 (±23.07) | 110.2 (±23.07) | 106.8 (±20.87) | 0.9 [-8.4 to 10.3] |
-2.4 [-11.8 to 6.9] |
-3.4 [-12.8 to 6] |
| MEP cmH2O | 127 (±25.27) | 119.3 (±25.48) | 119.1 (±18.75) | -7.7 [-17.2 to 1.8] |
-7.9 [-17.4 to 1.6] |
-0.2 [-9.7 to 9.2] |
| MV L/min | 17.75 (±2.84) | 18.63 (±2.95) ε | 19.55 (±2.98)* § | 0.9 [0.0 to 1.7] |
1.8 [0.9 to 2.7] |
0.9 [0.1 to 1.8] |
| Dyspnea Borg | 0.75 (1.5) | 2 (2.5) | 2.5 (2.25)* | NA | NA | NA |
| RR cpm | 18.53 (1.63) | 18.95 (2.74) | 20.38 (2.4)* | NA | NA | NA |
| VO2 mL/min | 543.2 (±154.8) | 541.6 (±159.2) | 575.1 (±181.5) | 1.6 [-44.5 to 41.3] |
-31.9 [-11 to 74.8] |
-33.5 [-9.4 to 76.4] |
| VCO2 mL/min | 458.5 (±131.7) | 468.5 (±133.7) | 497 (±155.9)* § | 10 [-3.9 to 23.8] |
38.5 [24.7 to 52.4] |
28.6 [14.7 to 42.4] |
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 means (±SD) or medians (IQR) and mean differences (when applicable) between backpack carrying positions are expressed as Means [95% CI]
* indicates a statistically significant difference between NB and UB with p<0.0
§ 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)