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Fig. 2. Mean ± s.d. of the metabolic cost of transport is shown as a
function of speed of progression for all the ice skates used in the present
study. Units of measure were converted from ml O2 to J, according
to the respiratory exchange ratio (see text for further details).
Iso-metabolic power curves (cost X speed=constant) are represented by
the two hyperbolae. Data referring to walking, running and riding a racing
bicycle on firm terrain are shown for the sake of comparison and were taken
from previous publications (Cavagna and
Kaneko, 1977; Capelli et al.,
1998). The cost of walking on snow at 0.67 m s–1
is also shown in respect to the footprint depth, reported in cm, as measured
by Pandolf et al. (Pandolf et al.,
1976). In relatively recent competitions, the introduction of
klapskates has allowed 5% faster speeds for energy cost values similar to
those reported here for modern ice skates.
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