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The rating of perceived exertion (RPE) could be a practical measure of global exercise intensity in team sports. The purpose of this study was to examine the relationship between heart rate (%HR_peak) and blood lactate ([BLa⁻]) measures of exercise intensity with each player's RPE during soccer-specific aerobic exercises. Mean individual %HR_peak, [BLa⁻] and RPE (Borg's CR 10-scale) were recorded from 20 amateur soccer players from 67 soccer-specific small-sided games training sessions over an entire competitive season. The small-sided games were performed in three 4min bouts separated with 3min recovery on various sized pitches and involved 3-, 4-, 5-, or 6-players on each side. A stepwise linear multiple regression was used to determine a predictive equation to estimate global RPE for small-sided games from [BLa⁻] and %HR_peak. Partial correlation coefficients were also calculated to assess the …