[Novel fitness techniques: patient selection and cardiovascular impact].

The main objective of this study was to evaluate a number of metabolic and cardiovascular variables during a standard 50 min class performed by spinning bike instructors of both sexes: 6 males and 6 females. Mean power output, heart rate, and oxygen uptake during the performance were 120 ± 4 W, 136 ± 13 bpm, and 32.8 ± 5.4 ml/kg/min respectively for males, and 73 ± 43 W, 143 ± 25 bpm, and 30 ± 9.9 ml/kg/min respectively for females. The analysis of individual performances showed that these were compatible with a physical exercise that ranged from moderate to heavy, to very heavy, the latter condition definitely prevailing. Results show that this type of fitness activity has a high impact on cardiovascular function, and suggest that it is unsuitable for unfit or sedentary individuals, especially if middle aged or elderly, who are willing to begin a recreational physical activity program.