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Introduction: measurement of cardiorespiratory fitness by assessing maximal oxygen uptake (VO2max) directly through exercise testing is the gold standard but this method is not widely available because it is expensive and requires complicated tools so that indirect methods are an option. Bruce protocol laboratory based exercise testing is more widely used because of its validity. Shuttle run 20 meters (SR-20), the field-based exercise testing compared to Bruce test become an alternative because it is easier, more practical and can be done on large groups. This study aims to find the relationship between predicted VO2max field based SR-20 and laboratory based Bruce exercise testing in adolescent. Method: observational analytic cross sectional. Eighty two subject (41 boys, 41 girls) 13-15 years old, did not have cardiovascular and metabolic diseases, body mass index (BMI) of 18.5-29 kg m2, mild-moderate physical activity level, no deformity in the lower limbs and posture disorders. Subjects performed SR-20 and 3-7 days later performed Bruce exercise testing. The predicted VO2max value of the SR-20 and Bruce was analyzed using the Pearson test with a p value <0.05 considered significant. Result: the data had normal distribution. The mean value of predicted VO2max SR-20 for boys was 46.05 ± 3,541, and girls 41.85 ± 3,746. The mean value of predicted VO2max Bruce for boys was 46.66 ± 8.765 while girls was 40.06 ± 6.210. The correlation coefficient between predicted VO2max SR-20 and Bruce in boys was r = 0.462, p = 0.002, in girls r = 0.407, p = 0.008. Conclusion: there is moderate relationship between predicted VO2max field based exercise testing SR-20 and laboratory based Bruce exercise testing in adolescent.