This study examined the cardiovascular response to low-impact step-aerobic dance in older subjects and the appropriateness of low-intensity step-aerobic exercise for cardiorespiratory fitness improvement in this age group. For this purpose, 6 women and 4 men, aged 57.3 ± 5.8 and 60.7 ± 3.1 (mean ± SD) years, respectively, were recruited. Oxygen consumption ( O 2 ), pulmonary ventilation ( E), heart rate (HR), and blood lactate were measured directly on each subject during a submaximal treadmill test (85% of age predicted maximal HR) and step-aerobic classes. O 2max was predicted by extrapolation using the HR and O 2 values measured in the submaximal treadmill test. Results showed no significant differences between women and men on any of the variables with the exception of body fat and stature (p < .05). BMI (kg • m 2 ) and body fat (%) values were 27.2 ± 3.8, 25.8 ± 1.9, and 33.4 ± 5, 19.2 ± 4.1 in females and males, respectively. O 2max for the group was 34.1 ± 5.3 ml • kg -1 • min -1 . Mean O 2 and HR during the aerobic phase of the step class were 20.7 ± 3 ml • kg -1 • min -1 (61 ± 7.5% of O 2max ) and 131 ± 11 beats • min -1 (81 ± 6.2% of HR max ) and mean blood lactate values at the end of the same phase were 2.14 ± 0.7 mMol • L -1 . Results showed that the intensity of the examined exercise was within the recommended ranges for cardiorespiratory fitness improvement of 55-90% of HR max or 50-85% of O 2max (1).