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Unformatted text preview: The Beneficial Effects of Increasing Physical Activity: It’s About Overload, Progression, and Specificity Overload is the physical stress placed on the body when physical activity is greater in amount or intensity than usual. The body’s structures and functions respond and adapt to these stresses. For example, aerobic physical activity places a stress on the cardiorespiratory system and muscles, requiring the lungs to move more air and the heart to pump more blood and deliver it to the working muscles. This increase in demand increases the efficiency and capacity of the lungs, heart, circulatory system, and exercising muscles. In the same way, muscle- strengthening and bone-strengthening activities overload muscles and bones, making them stronger. Progression is closely tied to overload. Once a person reaches a certain fitness level, he or she progresses to higher levels of physical activity by continued overload and adaptation. Small, progressive changes in overload help the body adapt to the additional stresses adaptation....
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This document was uploaded on 11/04/2011 for the course PFW 101 at Texas State.
- Fall '10