Fig. 2. Body-mass-specific induced power (Pind), profile power
(Ppro) and total power requirements assuming perfect
elastic energy storage (Pper) as a function of air density
in normoxic density-reduction trials. Error bars indicate 1 S.D. (N=5
individuals). Values of Ppro and Pper
derive from an assumed profile drag coefficient of 0.02 (see text).