Objective of the study was to offer workout intensity management standards for the 6-7 year-old wrestlers based on the energy mechanisms functionality and physical fitness tests and analyses. Methods and structure of the study. We sampled for the study, on the family and coach`s consent, three 7 year-old freestyle wrestlers having a two-year training experience, and tested them for: physical development (including body length and mass, BMI, muscle and fat mass, vital capacity, blood pressure and heart rate tests), physical fitness (including carpal strength, flexibility, standing long jump, shuttle sprint tests); speed-stepping treadmill tests till muscular failure (1.75 m/s stepped up by 0.25 m/s every 2 min). Exhaled carbon dioxide/ oxygen (CO2/ O2) was tested by Metalizer II Gas Analyzer test system (Cortex, Germany) and HR was tested prior to, during and after workouts with an ECG support. Blood lactate levels were tested after every workout stage in the rehabilitation process. The tests were designed to fix the maximal aerobic capacity, anaerobic threshold and oxygen uptake efficiency ratio. The anaerobic threshold range was verified by the pulmonary ventilation maximums with ventilation equivalents versus the lactate variations to obtain indirect anaerobic threshold rates and limits for the workout intensity zones. Results and conclusion. Despite the individual differences in the run times and speeds and physiological energy costs, every sampled athlete was tested to mobilize mostly the anaerobic energy mechanisms in the failure workout tests, with the relative energy demand kept at certain level; and the same applies to efficiency of the aerobic-anaerobic transition mechanisms, whilst the lactic efficiency was tested relatively low. The study to produce the workout intensity zoning by the anaerobic metabolism threshold related HR found the age-specific threshold achieved at 170+ beats/min. The key finding of the study is that the 6-7-year-old wrestlers` anaerobic threshold is attained at 170+ beats/ min and may be effectively used for the workout zoning purposes. Workout intensities in excess of this level may result, as we found, in irregularities of the cardiovascular system adaptation to the sport-specific workloads in long-time trainings.
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