Table 2.
Normalized maximum joint moment according to increased weight in each joint
| Variables | Directions | Dummy weight 4.6 kg | Dummy weight 9.8 kg | |||||
|---|---|---|---|---|---|---|---|---|
| Holding infant | Back carrying | Holding infant | Back carrying | Significance | ||||
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Posture | Weight | Interaction | ||
| Mean | Overall | 0.87 (0.22) | 1.19 (0.60) | 1.04 (0.27) | 1.27 (0.54) | * | NS | NS |
| distance | AP | 0.63 (0.16) | 0.80 (0.37) | 0.78 (0.21) | 0.92 (0.39) | * | *** | NS |
| (mm) | ML | 0.47 (0.14) | 0.68 (0.48) | 0.51 (0.17) | 0.67 (0.33) | * | NS | NS |
| Mean | Overall | 6.09 (1.32) | 8.29 (4.41) | 7.17 (1.82) | 9.46 (4.76) | * | ** | NS |
| velocity | AP | 4.80 (1.04) | 6.55 (3.47) | 5.78 (1.51) | 7.66 (3.95) | * | ** | NS |
| (mm/s) | ML | 2.75 (0.69) | 3.64 (2.10) | 3.08 (0.97) | 3.88 (2.08) | * | NS | NS |
| Peak | Overall | 45.94 (39.73) | 65.27 (56.40) | 52.17 (32.49) | 82.04 (68.09) | * | NS | NS |
| power | AP | 103.06 (64.72) | 181.72 (154.30) | 169.84 (102.73) | 248.02 (203.22) | * | ** | NS |
| (mm2/Hz) | ML | 86.69 (56.98) | 167.61 (207.53) | 103.52 (72.28) | 195.72 (190.62) | * | NS | NS |
| COP | 10.21 (5.37) | 21.26 (23.41) | 14.09 (7.04) | 26.38 (23.94) | * | * | NS | |
| area | ||||||||
| (mm2) | ||||||||
COP, center of pressure; SD, standard deviation; AP, anterio posterior; ML, medio lateral; *, 0.05; **, 0.01; ***, 0.001; NS, non significance.