Source

Martin C.K. et al., Effect of calorie restriction on the free-living physical activity levels of nonobese humans: results of three randomized trials, „Journal of Applied Physiology” 2011, 110, 956–963.
Wilmore J.H., Variations in physical activity habits and body composition, „International Journal of Obesity and Related Metabolic Disorders” 1995, 19(4), 107–112.
Wing R., Physical activity in the treatment of the adulthood overweight and obesity: current evidence and research issues, „Medicine & Science in Sports & Exercise” 1999, 31, 547–552.