Purpose: The aim of the study was to assess the level and dynamics of changes in the anaerobic threshold and V02max of junior and senior canoeists in a training macrocycle. Methods: In examinations 13 canoeists participated in the age of 14-27 years representing the diversified sports level (junior man = 6 and senior man = 7). Examinations were being carried out three times in the training macrocycle: at the beginning of the preparatory period, at his ending and in the competition period. All athletes underwent a graded exercise test (GXT) on a Dansprint PRO Canoe Ergometer. GXT began at workload of 0.3 W/kg. The work rate was incremented by 0.3 W/kg every 3 min until the subject could no longer maintain the workload. Each test lasted 12-18 min depending on age and aerobic fitness status. Physiological measurements: expired gases, minute ventilations (Ve) and heart rate (HR) during GXT were monitored continuously with an automated system (Oxycon Mobile). Oxygen intake (V02) and carbon dioxide output (VC02) were measured breath-by-breath, and were averaged at 15-s time periods. Peak V02 was defined as the highest 15-s averaged V02 obtained during the last exercise load on the test. HRmax (bpm) was measured as the highest 15 second average value in the test. To determine anaerobic threshold (AT) the OBLA method was administered. Lactate level was determine (Blood gas analyzer ABL90 FLEX) in capillary blood samples taken before GXT and after each workload. Results: The threshold values of juniors changed in the macrocycle from the value of 51.07 (W) at the beginning of the preparatory period to 67.3 (W) at its end and to 68.35 (W) in the competition period. Relative power varied accordingly: from 0.75 (W / kg), through 098 (W / kg) to 0.99 (W/kg) and V02max from 46.6 (ml/kg/min) in the first term. 47,77 (ml/kg/min) in the second term and 49.22 (ml/kg/min) in the third term. The threshold values of seniors changed accordingly: from 79.9 (W). 94.09 (W) to 97.23 (W). relative power per kg from 0.97 (W/kg). 1.12 (W/kg) to 1.17 (W/kg) and V02max from 50.16 (ml/kg/min). 50.79 (ml/kg/min) to 51.90 (ml/kg'min). Conclusion: There were found dynamic changes in performance indicators during the preparatory period and only slight increases in the competition period. The competitors of both groups slightly differed in the level of Vo2max. while significant differences were observed in the values of threshold power and relative threshold power (better indicators of performance).
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