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The purpose of this study was to compare weather the perceptual or physiological determinants of endurance running performance is better predictor in an elite and active individual. Methods: Eleven long distance male runners were recruited to take part in the study. Each participant completed an incremental exercise test to exhaustion to identify V̇ O2max and maximal minute power output, a submaximal test to assess lactate threshold and running economy, a fixed power output equivalent to 75% V̇ O2max the slope of the increase in perception of effort over time, termed ‘perceptual efficiency, and a 5000m running performance. Pearson bivariate 2-tailed correlation tests were used to determine correlations between variables, and single linear regression tests were performed to determine standard error of the estimate (SEE), and 95% confidence interval (CI). Results: The best predictor of laboratory 5000m running performance were RPE slope (r = 0.86, p < 0.01 SEE= 15.3%). Standard error of the estimate was 16.0%, and the V̇ O2max was also strongly correlated with running performance (r = 0.84, p < 0.01; SEE = 18.5%). Finally, the Blood lactate at 2 mM.L-1 (W) (r = 0.63, p < 0.05, SEE = 33.42%). However, blood lactate at 4 mM.L-1(W) (r = 0.51, p ˃ 0.05, SEE = 39.42%), and also Running Economy at speed 10km V̇ O2 (ml.kg-1.min-1) (r = 0.32, p ˃ 0.05, SEE = 38.06%) were not correlate with 5000m running performance. Discussion: The results showed that RPE and V̇ O2max were the strongest predictors of laboratory 5000m running performance. Even though other measures of participant mass, running performance at a blood lactate of 2mmol/L were significantly related to 5000m running performance, linear regression analysis identified that the best predictor of 5000m running performance were RPE and V̇ O2max. (Published abstract)