The objectives of the study were to evaluate the validity and reliability of the Chinese-translated versions of the Borg 6-20 Rating of Perceived Exertion (RPE) scale and the Children's Effort Rating Table (CERT) during continuous incremental cycle ergometry in 10-11 year-old Hong Kong school children. A total of 69 children were randomly assigned to one of the following two groups using the CERT and RPE scales respectively: CERT (n=35) and RPE (n=34). Both groups performed two trials of identical incremental continuous cycling exercise one week apart. Objective measures of exercise intensity (heart rate, absolute power output, and relative oxygen consumption) and subjective measures of effort were obtained during incremental exercise on both trials. Interclass correlations (Pearson's r) were computed to quantify the validity of each scale (CERT and RPE) against the measures of objective exercise intensity. Test-retest reliability of each scale across the two trials was quantified using the intraclass correlation (R), obtained from a two-way ANOVA model. For both the CERT and RPE groups, significant (p < .01) Pearson correlations were found when perceived effort ratings were correlated with heart rate (rs > .69), power output (rs > .75), and oxygen consumption (rs > .69). In addition, correlations for CERT were consistently higher than that for RPE. High test-retest intraclass correlations were found in both the CERT (R=.96) and RPE (R=.89) groups, indicating that both scales were reliable. In conclusion, the CERT and RPE scales, when translated to the Chinese version, are valid and reliable measures of exercise intensity during controlled exercise in children. The CERT appears to be more feasible than the RPE scale for children.Keyword(s): exercise/fitness, measurement/evaluation, research