In this paper there are analysed the physiological indicators of untrained women’s and professional atheletes’ cardio-respiratory system maximum oxygen consumption (VO2 max.) and heart rate, during a physical effort on a bicycle ergometer. The first leap of this parameter was noticed during the 4th minute of the both women training, but the athlete’s VO2 max. result was higher. The second upsurge of the indicators was observed during the 8th minute, when the athlete’s result was excellent while the untrained women’s was established as a good one. This certain result proves excellent athletic performance and good functional abilities of the body.