Net metabolic rate of walking at 1. 5 m/s vs Net metabolic rate of walking at 1.5 m/s vs. percent body fat for all subjects (n = 39). •, Obese women; ▪, obese men; ○, normal-weight women; □, normal-weight men. Net metabolic rate of walking at 1.5 m/s vs. percent body fat for all subjects (n = 39). •, Obese women; ▪, obese men; ○, normal-weight women; □, normal-weight men. Line is least squares linear regression, y = 0.019x + 2.844, r2 = 0.43, P < 0.001. Raymond C. Browning et al. J Appl Physiol 2006;100:390-398 ©2006 by American Physiological Society