Fig. 2. Typical accelerations (m s-2) and ground reaction forces (N) in
the forward (Ff) and vertical (Fv)
direction during a step at a low (A), intermediate (B) and fast (C) speed in a
young child (left column) and an adult (right column). The double contact (DC)
phase is delimited by the vertical dotted lines. Arrows indicate the peak of
the forward ground reaction force on the back leg (peak
Ff,back). Left column: a 4.9-year-old female, mass of 17.75
kg, leg length of 0.535 m, walking at 0.72 m s-1, 1.21 m
s-1 and 1.56 m s-1 (A to C). Right column: a
20.2-year-old male, mass of 64.90 kg, leg length of 0.919 m, walking at 0.84 m
s-1, 1.37 m s-1 and 2.58 m s-1 (A to C).
Other indications are as in Fig.
1.