Proprioception is affected during sports events, thus jeopardizing performance and even the well-being of athletes. To effectively control the injury risk and performance, sport professionals should find out how long the proprioceptive damage lasts. OBJECTIVE: To analyze acute effects of an anaerobic lactic exercise on the knee joint position sense of athletes and the duration of these effects until twenty-four hours later. METHODS: Fifteen athletes performed two training sessions one week apart: Warm-up: 30-minute warm-up; and Lactic Exercise: 30-minute warm-up and an anaerobic lactic exercise session. All athletes carried out a joint position sense test of knee, as well as a blood lactate and heart rate analysis before (Pre), just after (Post_{0Min} ), thirty minutes after (Post_{30Min} ) and 24 hours (Post_{24H} ) after each training session. RESULTS: Absolute angular error in knee positioning increased just after Lactic Exercise with statistically higher values than after Warm-up Exercise (p=0.001) and gradually decreased toward 24 hours later. Relative angular error in knee positioning decreased statistically significant 24 hours after Lactic Exercise (p=0.021). CONCLUSION: Anaerobic lactic exercise immediately depletes the accuracy of knee joint position sense, although it is recovered 30 minutes later. After 24 hours, knee joint position sense is better than baseline. ABSTRACT FROM AUTHOR
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