The purpose of this study was to investigate the characteristics of the respiratory compensation point (RCP) in overweight and normoweight boys and to clarify changes in the RCP over 4 years. This study was conducted with 11 overweight boys and 14 boys with normal weight. The boys performed the graded test every 2 years (three series) beginning at the age of 9–10 years and finishing at the age of 13–14 years. During the test, the RCP was detected. In every series, the RCP occurred earlier in the overweight boys than in the normoweight boys and at a significantly (P<0·05) lower rate relative to body mass power output (P kg−1). Relative oxygen uptake (VO2 kg−1) at the RCP in all studies was also significantly (P<0·05) lower in the group of overweight boys. The maximum level of analysed indicators (VO2max; Pmax) differentiated both groups in similar ways as their level noted at RCP. This study showed significant (P<0·05) correlation between the values VO2max kg−1 and VO2 kg−1 at RCP in each series of the test and between Pmax kg−1 and P kg−1 at RCP. The respiratory compensation point seems to be a good method for evaluating aerobic performance in children (also overweight). During puberty, a decreasing tendency in aerobic performance was observed in both groups.