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We have adapted a model of 100-m sprint performances to simulate the effects of wind velocity and race altitude on 110-m hurdle performance. For a 2 m.s-1 wind in the direction of motion, performance improves by 0.19 seconds. Each 625 m of altitude improves performance by 0.03 s. These effects are approximately twice the magnitude of those in the 100-m sprint. According to our estimated corrections, the current event World Record holder Colin Jackson should keep his title, albeit due to a difference race run under more extreme conditions (headwind and altitude). KEYWORDS: athletics, world records. Reprint pdf · Reprint doc · Reviewer's Comment