What is the physiological mechanism behind why people who are overweight or less "in-shape" get out of breath more easily than those who are in good shape?
Is it purely power to weight ratio? What are the factors involved?
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Part of why some people get out of breath faster is due to an inefficiency in the lungs and in the muscles. Muscles use oxygen when they move, the more they move the more oxygen they use. However, muscles are able to adapt and become more efficient in someone who is consistently active. Also, the lungs are powered by intercostal muscles, which are a bunch of small muscles, and the diaphragm. Someone who is fit usually takes deep breaths to account for the increase in Oxygen needed for physical activity, and do this consistently with their exercise routine. Their diaphragm and other lung muscles get stronger with the regular deep breaths taken, making their lungs work more efficiently as well.http://www.active.com/articles/breathing-101-increase-your-efficiency-for-better-oxygen-uptake