This study was aimed to inquire the main causes of qualified skiers' cold diseases arising. The author's position is based on the consideration, that morbidity level depends in higher grade of the training loads' dynamics than of common physical state of a body. Four wide groups of morbidity factors were defined, such as natural, ecological, training and psychological ones. Detailed analysis of skiers' morbidity arising at different stages of competitive period is represented in conclusions of the article.
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