The Essentials of Health a Text book On Anatomy Physiology Hygiene Alcohol
The Essentials of Health a Text book On Anatomy Physiology Hygiene Alcohol
C H Charles Henry Stowell
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EXERCISE. 193 General exercise should not be too violent ; over-ex- ercise is nearly as bad as no exercise. Any exercise is too violent which leaves the body " all tired out. " Such exercise unfits the body for regular work, and may prove injurious to the nervous system. Healthful exercise should bring a restful feeling, a desire for work, and refreshing sleep. Work and Rest. Each time a muscle contracts there is a waste of some of its substance. During the active work of a muscle, the waste fa...r exceeds the repair. The worn-out material accumulates faster than it can be carried away, and the body experiences a sense of fatigue. If exercise be continued until the body is greatly fatigued, and if such exercise be frequently repeated, the muscles will gradually \vaste away as though they were not used at all. If a muscle be made to work, it must have its periods of rest. The heart never appears to be tired. It beats on, year after year, with an astonishing regularity. But it would soon wear out did it not have a period of com- plete rest between its beats.
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