Effect of Fatigue upon Static and Dynamic Balance Control in Athletes with Acute Ankle Sprain

The overweighed cases like the patients with the injury of ankle sprain having problems with their Balance control system. The aim of this study was to investigate the effect of fatiguing exercise on the static and dynamic balance changes in athletes with the ankle sprain. In this Case- Control study, 30 active athletes and 14 cases with previous severe ankle sprain as case group and 16 healthy cases as control group were inverted in a treadmill running protocol in 2 experimental sessions. Center-of-pressure sway velocity in single-legged stance and time to stabilization (TTS) after a unilateral jump-landing task (first session) and maximum reach distance in the Star Excursion Balance Test (SEBT) (second session) were assessed before and immediately after the treadmill exercise. In the unfatigued condition, between-groups the significant difference was found only in the anterior-posterior TTS (P< 0.5, ES<0.39). Group-by-fatigue interactions were found for mean SEBT (P<0.03, ES <0.43) and anterior-posterior TTS (P<0.02, ES<0.48). Prefatigue versus postfatigue SEBT and TTS tests differences were greater in previously injured athletes, whereas static sway velocity increased similarly in both groups. Fatiguing duo to running significantly affected static and dynamic postural control in participants with a history of ankle sprain. Fatigue-induced alterations of dynamic postural control were greater in athletes with a previous ankle sprain. Thus, even after successful return to competitions, ongoing deficits in sensorimotor control may contribute to the enhanced ankle reinjury risk.