Recently, several authors have proposed the use of a submaximal `perceptually regulated exercise test` (PRET) to predict maximal oxygen uptake (VO2max). The PRET involves asking the individual to self-regulate a series of short bouts of exercise corresponding to pre-set ratings of perceived exertion (RPE). The individual linear relationship between RPE and oxygen uptake (RPE:VO2) is then extrapolated to the VO2max, which corresponds to the theoretical maximal RPE (RPE20). Studies suggest that prediction accuracy from this method may be better improved during a second PRET. Similarly, some authors have recommended an extrapolation to RPE19 rather than RPE20. Objectives: The purpose of the meta-analysis was to examine the validity of the method of predicting VO2max rom the RPE:VO2 during a PRET, and to determine the level of agreement and accuracy of predicting VO2max from an initial PRET and retest using RPE19 and RPE20. Data Sources: From a systematic search of the literature, 512 research articles were identified. Study Eligibility Criteria: The eligible manuscripts were those which used the relationship between the RPE=15 and VO2, and used only the Borg`s RPE scale. Participants and Interventions: Ten studies (n = 274 individuals) were included. Study Appraisal and Synthesis Methods: For each study, actual and predicted VO2max from four subgroup outcomes (RPE19 in the initial test, RPE19 in the retest, RPE20 in the initial test, RPE20 in the retest) were identified, and then compared. The magnitude of the difference regardless of subgroup outcomes was examined to determine if it is better to predict VO2max from extrapolation to RPE19 or RPE20. The magnitude of differences was examined for the best PRET (test vs retest). Results: The results revealed that VO2max may be predicted from RPE:VO2 during PRET in different populations and in various PRET modalities, regardless of the subgroup outcomes. To obtain greater accuracy of predictions, extrapolation to RPE20 during a retest may be recommended. Limitations: The included studies reported poor selection bias and data collection methods. Conclusions and Implications of Key Findings: The VO2max may be predicted from RPE:VO2 during PRET, especially when VO2max is extrapolated to RPE20 during a second PRET.
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