Fig. 7. Mean muscle power output (Pmus) measured in the SUPRA
and PECT muscles of the pigeon (Columba livia) during different modes
of flight compared with the estimated inertial power requirement
(Piner) for upstroke and aerodynamic power requirement
(Paero) assuming that all lift is provided during
downstroke. Values for Pmus are doubled to represent
output from paired left and right muscles. Values are means ± s.d.,
N=7 (except ascending N=6).