The aim of the present work is to determine power and physiological changes in the body of aerobics competitors with different skills at the moment of exercise performing. 24 aerobic competitors were selected as a research object. All the members of the research group were divided into three groups with reference to their personal data (obtained after the assessment of the relations between their indices and their skills). The groups were as follows: group 1 – highly skilled aerobic competitors, group 2 – moderately skilled aerobic competitors and group 3 – the beginners. The indices have also been analyzed with reference to the exercises preformed by the aerobic competitors. During the assessment the following indices were measured: ventilation of the lungs, circulation of the breathing gasses, heart rate and blood lactate concentration. The research results suggest that all the research groups show high aerobic power consumption (~50%), slightly less anaerobic alactatic power consumption (~30%) and lactatic power consumption appears to be the least (~20%). Highly skilled aerobic competitors proved to consume less anaerobic – alactatic power. The aerobic competitors participating in the aerobic trio exercises showed higher indices of heart rate (p<0,05) comparing with group exercise. Ventilation of the lungs, lungs volume, breathing rate and ratio as well as oxygen consumption were not influenced by the exercise type. All the research groups showed high differences in... [to full text]