Table 6.
Comparison of body mass and gait between initially obese individuals who lost 42.2 kg of body mass and a lean age- and gender-matched comparison group
| Variable | Weight Loss Group at T2 (means ± SD) | Comparison Group (means ± SD) | Δ | t-Test P Value |
|---|---|---|---|---|
| Mass, kg | 83.5 ± 20.3 | 62.3 ± 11.7 | 21.2 | 0.001 |
| Stride analysis | ||||
| Swing time, % | 38.0 ± 1.6 | 40.1 ± 0.9 | −2.1 | 0.001 |
| Step length, m | 1.53 ± 0.14 | 1.53 ± 0.10 | 0.0 | 0.963 |
| Velocity, m/s | 1.51 ± 0.04 | 1.52 ± 0.01 | −0.01 | 0.114 |
| Cadence, steps/min | 119.7 ± 8 | 122.2 ± 7 | −2.5 | 0.487 |
| Joint kinematics | ||||
| Hip ROM, ° | 34.4 ± 7.7 | 37.1 ± 4.01 | −2.7 | 0.323 |
| Hip AP, ° | −6.1 ± 2.6 | −4.3 ± 2.3 | −1.8 | 0.117 |
| Maximal KF, ° | −14.8 ± 5.6 | −18.4 ± 4.8 | 3.6 | 0.136 |
| Knee AP, ° | −9.4 ± 3.9 | −11.6 ± 3.1 | 2.2 | 0.174 |
| Ankle AP, ° | −1.8 ± 2.2 | 0.1 ± 3.3 | −1.9 | 0.151 |
| Ground forces | ||||
| VGRF, N | 926.3 ± 223 | 744.1 ± 131 | 182.2 | 0.039 |
| VGRF, N/kg | 11.1 ± 0.4 | 12.0 ± 0.9 | −0.9 | 0.011 |
| Slope, N·s | 6,250 ± 1,094 | 5,362 ± 917 | 888 | 0.065 |
| Slope, N·s−1·kg−1 | 76.2 ± 7.0 | 87.0 ± 11.7 | −10.8 | 0.022 |
| Braking force, N | −192 ± 51 | −151 ± 27.0 | −41.0 | 0.039 |
| Braking force, N/kg | −2.3 ± 0.23 | −2.5 ± 0.37 | 0.2 | 0.258 |
| Joint torques | ||||
| Hip, Nm·s | 8.4 ± 3.2 | 8.9 ± 2.2 | −0.5 | 0.680 |
| Hip, Normalized | 0.62 ± .21 | 0.90 ± 0.29 | −0.3 | 0.026 |
| Knee1, Nm·s | 7.6 ± 3.7 | 4.3 ± 2.4 | 3.3 | 0.030 |
| Knee1, Normalized | 0.53 ± 0.18 | 0.43 ± 0.26 | 0.1 | 0.329 |
| Knee2, Nm | 51.1 ± 18.7 | 34.0 ± 16.3 | 17.1 | 0.042 |
| Knee2, Normalized | 3.70 ± 1.03 | 3.30 ± 1.74 | 0.4 | 0.716 |
| Ankle, Nms·s | 28.3 ± 10.6 | 22.0 ± 10.6 | 6.3 | 0.199 |
| Ankle, Normalized | 2.0 ± .22 | 2.0 ± 0.40 | 0.0 | 0.545 |
| Knee3, Nms·s | −37.0 ± 19.3 | −27.8 ± 6.5 | −9.2 | 0.170 |
| Knee3, Normalized | −2.5 ± 0.84 | −2.7 ± 0.65 | 0.2 | 0.631 |
T2, follow-up 2 at 12.4 mo after surgery. Δ, Absolute difference between the 2 groups, expressed as weight loss minus comparison group. Italics denote P < 0.05.