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Overtraining
Overtraining can be described as a point where a person may have a decrease in performance and plateauing as a result from failure to consistently perform at a certain level or training load exceeds their recovery capacity. They cease making progress, and can even begin to lose strength and fitness. Overtraining is also known as chronic fatigue, burnout and overstress in athletes.〔Peluso, M., & Andrade, L. (2005). Physical activity and mental health: the association between exercise and mood. Clinics, 60(1), 61-70. 〕 It is suggested that there are different variations of overtraining, firstly monotonous program over training suggest that repetition of the same movement such as certain weight lifting and baseball batting can cause performance plateau due to an adaption of the central nervous system which results from a lack of stimulation.〔 A second example of overtraining is described as chronic overwork type training where the subject may be training with too high intensity or high volume and not allowing sufficient recovery time for the body.〔 It is important to note the difference between overtraining and over-reaching; over-reaching is when an athlete is undergoing hard training but with adequate recovery, overtraining however, is when an athlete is undergoing hard training without the adequate recovery. Up to 10% of elite endurance athletes and 10% of American college swimmers are affected by overtraining syndrome (unexplained underperformance for approximately 2 weeks even after having adequate resting time).
==Addiction==
Overtraining can lead to exercise addiction which can lead to negative physiological and psychological effects, an addictive craving for physical activity is shown to lead to extreme exercise whilst building up a tolerance to the exercise then needing to go further levels to achieve the same high. Like pharmacological drugs, physical exercise may be chemically addictive. Addiction can be defined as, the frequent engaging in the behavior to a greater extent or for a longer time period than intended. It is theorized is that this addiction is due to natural endorphins and dopamine generated and regulated by the exercise. Whether strictly due to this chemical by-product or not, some people can be said to become addicted to or fixated on psychological/physical effects of physical exercise and fitness. This may lead to overexercise, resulting in the "overtraining" syndrome.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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