Postprint version. Published in Exercise and Sport Sciences Reviews, Volume 38, Issue 1, January 1, 2010, pages 25-30.
Copyright © 2010 American College of Sports Medicine. This is a non-final version of an article published in final form in Exercise and Sport Sciences Reviews. The definitive version is available at http://dx.doi.org/10.1097/JES.0b013e3181c5cd98.
Physical activity is an important contributor to regulation of energy balance and body composition. In this article, we separate the impact of exercise from the confounding influence of energy imbalance and highlight sex differences in hormonal and appetite responses to physical activity. The evolving story may influence our thinking regarding the use of physical activity to manage body composition.