OBJECTIVE: The aim of the present study was to verify the VO2Maxdecline related to age. METHODS: 152 male subjects with age ranging from 20 to 50 years were analyzed. All of them were exercise practitioners of Moby Dick Gym, Curitiba-Parana, Brazil. The sample was divided in 6 groups, considering age: 1) 20–24, 2) 25–29, 3) 30–34, 4) 35–39, 5) 40–44, 6) 45–49 (See in TABLE 1). The variables used in this study were Body Fat and VO2Max. For skin fold measures, a Cescorf Skin caliper was used, and the body fat percentage was determined by the 7 skin fold equation of Jackson and Pollock. To VO2Max determination, we utilized the Astrand Cyclergometer submaximal exercise Protocol. We compared the first group with all others, and also compare each by each group. A One-Way ANOVA was used to detect significant differences, and when the later were found, a post-hoc scheffe was utilized to determine the local of differences. The significance level was set at p<0.05.TABLE 1: Sample Characteristics and ResultsRESULTS: When compared the Group 1 vs. any other group, significant differences were found either in body fat percentage and VO2Max. We observed an increase in body fat and a decline in VO2Maxrelated to age. However, when other comparisons were made, no significant differences were found, even when the Group 2 was compared with Group 6. CONCLUSION: Our study demonstrated that, in this sample, a decline in VO2Max is observed when the comparison is made between the youngest group and the others groups, which were composed with more aged subjects. The same is noted in relation to body fat. However when the comparisons are made between more closely groups, no significant differences were found.