Athletes were taken to an altitude of 2100 m and allowed to get adapted to the highland environment for a month. Then blood serum neutral peptide-hydrolases were measured at rest and after exercise. Also, metabolic and respiratory parameters were investigated. In response to identical workloads some subjects showed a decrease (Group 1) while others showed an increase (Group 2) of proteolytic activity. Group 1 subjects exhibited high reactivity of the respiratory system whereas Group 2 subjects showed enhanced anaerobic glycolysis.

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