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Although the setting free of energy, when a muscle contracts, is a non-oxidative process, oxygen is necessary for the restoration of its potential energy, and, in the absence of oxygen, mammalian muscle rapidly loses the power of contraction. Further, since the energy of muscular work is ultimately obtained from the oxidation of the food-stuffs, the enormous increase in the amount of energy developed in the muscles during exercise involves a corresponding rise in the intensity of their metabolic activities and in the extent to which they consume oxygen. Indeed, it is now well known that the amount of oxygen which a man consumes is a criterion of the degree of activity of his muscles during exercise.
A man, who is performing hard physical exercises, may use eight or ten times as much oxygen as during rest, and the burden of meeting this demand for oxygen falls upon the respiratory and circulatory systems, which, for this purpose, are indissolubly linked together.
Every increase in the requirements of the body for oxygen is accompanied by adaptive changes in the circulation and the respiration, which enable oxygen to be transferred more rapidly from the lungs to the tissues; and the rapid, deep breathing, the powerfully beating heart, the high blood-pressure, and the frequent pulse, present in the man who is engaged in violent exercise, are just as much a part of the exercise, and just as vital to its effective performance, as the movements of the muscles themselves.
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