Fig. 3.
Mass of pectoralis and heart muscle in cold-trained and exercise-trained house sparrows. Linear least-squares regressions of log10-transformed pectoralis (Mpec; right side only) and heart (Mheart) masses on log10 body mass (Mb) for cold-trained (A,B) and exercise-trained (E,F) house sparrows. Body mass values for these regressions were Mb minus the mass of the organ in question. Slopes did not differ significantly for all regressions. Bar graphs show least squares means (±s.e.) in trained and control birds for Mpec (C,G) and Mheart (D,H). *P<0.05.