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Fig. 6. Positive and negative external work durations. The times during which
positive external work is done at each step during the push (open circles and
red bars in Fig. 1) and
negative external work is done during the brake (filled circles and blue bars
in Fig. 1) are plotted as a
function of the running speed. It can be seen that the duration of positive
external work is clearly greater than the duration of negative external work
up to a speed of 14 km h–1 (asterisks indicate
P<0.05: see Table
1). This suggests that, with increasing speed, the work
contribution by the contractile machinery is progressively substituted by
elastic storage and recovery by tendons (see text). Statistics as in
Fig. 2.
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