1.Introduction。There is abundant evidence that the amount of habitual physical activity(PA)and the level of cardiorespiratory fitness(CRF)are inversely related to developing chronic diseases,including cardiovascular(...1.Introduction。There is abundant evidence that the amount of habitual physical activity(PA)and the level of cardiorespiratory fitness(CRF)are inversely related to developing chronic diseases,including cardiovascular(CV)disease(CVD).Relative to the CV and all-cause mortality reductions associated with exercise,intensity and duration also appear to be inversely related.For example,the mortality reductions that are associated with a regular 5-min run~a 15-min walk,and a 25-min run~a 105-min walk.1 In addition,at comparable levels of total energy expenditure,vigorous exercise seems to be more effective than moderate-intensity exercise in reducing CV risk.2 Vigorous exercise training is also more effective than moderate intensity training at increasing CRF,expressed as metabolic equivalents or METs,which has been shown to confer a lower risk of mortality.3 Accordingly,the optimal physiologic,clinical,and survival benefits of exercise are most likely to be achieved by progressing from moderate intensity exercise(usually defined as 40%-59%of functional capacity or 55%-69%of the maximal heart rate)to vigorous training regimens,corresponding to≥60%of functional capacity or 70%-89%of the measured maximal heart rate.展开更多
文摘1.Introduction。There is abundant evidence that the amount of habitual physical activity(PA)and the level of cardiorespiratory fitness(CRF)are inversely related to developing chronic diseases,including cardiovascular(CV)disease(CVD).Relative to the CV and all-cause mortality reductions associated with exercise,intensity and duration also appear to be inversely related.For example,the mortality reductions that are associated with a regular 5-min run~a 15-min walk,and a 25-min run~a 105-min walk.1 In addition,at comparable levels of total energy expenditure,vigorous exercise seems to be more effective than moderate-intensity exercise in reducing CV risk.2 Vigorous exercise training is also more effective than moderate intensity training at increasing CRF,expressed as metabolic equivalents or METs,which has been shown to confer a lower risk of mortality.3 Accordingly,the optimal physiologic,clinical,and survival benefits of exercise are most likely to be achieved by progressing from moderate intensity exercise(usually defined as 40%-59%of functional capacity or 55%-69%of the maximal heart rate)to vigorous training regimens,corresponding to≥60%of functional capacity or 70%-89%of the measured maximal heart rate.
