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Fig. 5. Rate of energy expenditure of ruff sandpipers at rest (speed 0) and during
running at various speeds. Line indicated was fitted by linear regression for
exercise values only (y=0.02x+2.19). The cost of transport
of running ruffs (=slope of line) is 1.29 J m1. Values are
means ± S.E.M. (sample sizes as in
Fig. 3).
*Significant difference from control value at speed 0
(P<0.005).