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Fig. 2. The mass-specific internal work done per stride to accelerate the limbs
relative to the centre of mass of the body (Wint,k) and
the stride frequency (f) are shown as a function of speed in each age
group (top and middle row, respectively). The mass-specific internal power
spent to move the limbs relative to the centre of mass of the body
(
int,k=Wint,kxf)
is presented as a function of speed in the bottom row. Each symbol is the mean
of the data grouped into 0.13–0.14 m s–1 (0.5 km
h–1) intervals along the abscissa. Bars indicating the
S.D. of the mean are drawn when they exceed the size of the symbol.
The figures near each symbol in the top row represent N. The broken
lines indicate the adult trends: in the top and middle panels, lines represent
the weighted mean of the adult data, whereas in the bottom panels, lines are a
second-order polynomial fit (KaleidaGraph 3.6). Note that the mass-specific
int,k is larger in children
due to a higher stride frequency with an approximately equal internal work per
stride.
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