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PFEIFFER, KA, JM PIVARNIK, CJ WOMACK, MJ REEVES, and RM MALINA. Reliability and validity of the Borg and OMNI rating of perceived exertion scales in adolescent girls. Med. Sci. Sports Exerc., Vol. 34, No. 12, pp. 2057–2061, 2002. To examine the reliability and validity of the Borg and OMNI rating of perceived exertion (RPE) scales in adolescent girls during treadmill exercise. Adolescent girls (N 57, age 15.3 1.5 yr) were randomly assigned to use an RPE scale (Borg or OMNI) during one of three treadmill submaximal exercise conditions (walking, walking uphill, or jogging). After RPE assessment, exercise intensity was increased until participants achieved volitional exhaustion (VO2max). Expired respiratory gases and heart rate (HR) were measured continuously during exercise. Reliability of the RPE scales was assessed using ANOVA (intraclass) and Spearman-Brown prophecy formula (single trial) measures. Validity estimates were calculated using Pearson Product Moment correlations, with% HRmax and% VO2max as criterion measures. Intraclass and single-trial reliability estimates were higher for the OMNI (rxx 0.95 and rkk 0.91, respectively) compared with the Borg (rxx 0.78 and rkk 0.64, respectively) RPE scale. Validity estimates were also higher for the OMNI scale compared with the Borg scale. Validity coefficients (rxy) for% HRmax and% VO2max comparisons were 0.86 and 0.89, respectively, for the OMNI, compared with 0.66 and 0.70, respectively, for the Borg. The OMNI cycle pictorial scale was found to be reliable and valid for use with adolescent girls. It also appears to be more …