To produce mean velocities of @ % , @ % , and @ % of vLTP@ , running speeds were calculated as @ @ km/h ( @ % vVO ( @max ) ) , @ @ km/h ( @ % vVO ( @max ) ) , and @ @ km/h ( @ % vVO ( @max ) ) , which gave a mean blood lactate concentration ( La ) of @ @ mmol/L , @ @ mmol/L , and @ @ mmol/L , respectively .