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Fig. 6. The mass-specific internal power (Wint) and total
mechanical power (
tot) are
shown as a function of walking speed. The speed is normalised using the
dimensionless Froude number
[
(gl),
where 
f is the forward
mean walking speed, g is the acceleration of gravity and
l is the leg length], which allows different size subjects to be
compared. Each age group is represented by a different symbol (circles,
3–4 years; squares, 5–6 years; diamonds, 7–8 years;
triangles, 9–10 years; inverted triangles, 11–12 years). Broken
lines represent the weighted mean of the adult data (KaleidaGraph 3.6). Other
indications are as in Fig. 2.
Note that normalisation of the speed reduces the differences between adults
and children.
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