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Table 1.

Peak ground reaction forces

Ground reaction forces
Anterior/posteriorVerticalWalking speed (% PTS)
Braking phase -0.12±0.01 1.03±0.03 40 
 -0.18±0.00 1.10±0.03 60 
 -0.25±0.00 1.25±0.06 80 
 -0.31±0.01 1.43±0.20 100 
 -0.34±0.01 1.61±0.25 120 
Propulsion phase 0.13±0.02 1.02±0.02 40 
 0.19±0.04 1.07±0.03 60 
 0.26±0.04 1.13±0.02 80 
 0.30±0.06 1.12±0.08 100 
 0.27±0.09 0.97±0.12 120 
Ground reaction forces
Anterior/posteriorVerticalWalking speed (% PTS)
Braking phase -0.12±0.01 1.03±0.03 40 
 -0.18±0.00 1.10±0.03 60 
 -0.25±0.00 1.25±0.06 80 
 -0.31±0.01 1.43±0.20 100 
 -0.34±0.01 1.61±0.25 120 
Propulsion phase 0.13±0.02 1.02±0.02 40 
 0.19±0.04 1.07±0.03 60 
 0.26±0.04 1.13±0.02 80 
 0.30±0.06 1.12±0.08 100 
 0.27±0.09 0.97±0.12 120 

Peak experimental anterior/posterior and vertical ground reaction forces(GRF) (mean ± 1 s.d.) as walking speed increased from 40 to 120% PTS. During the braking phase, the peak anterior/posterior and vertical GRFs continued to increase beyond the PTS. However, during the propulsive phase, the vertical GRF increases up to 80% PTS, and then begins to decrease at the PTS, with the value at 120% PTS being significantly lower. Similarly,the anterior/posterior GRF increases up to the PTS and then the trend abruptly changes after the PTS [indicates the value is significantly different than the value at the previous speed (P<0.05)]. Note,the GRF values are normalized to body weight.

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