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Fig. 4. Forced and voluntary running energetics in Mongolian gerbils (pooled data
from 40 individuals). The open circles and broken regression line show values
from forced treadmill exercise, with each point representing one individual at
one speed. The solid circles and solid regression line show values from
voluntary exercise. Regression coefficients and r2 values
are shown as averages of individual means (bottom) and from pooled data (top).
Points from voluntary exercise are 1 min averages separated by 3 min intervals
to avoid autocorrelation (see text). For comparison, the maximum power output
in forced exercise (i.e.
O2max) is about
196 kJ kg–1 h–1.
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