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Armstrong, W J.1; Yaggie, J A.1

Medicine & Science in Sports & Exercise: May 2003 - Volume 35 - Issue 5 - p S315
G-15I Free Communication/Thematic Poster Balance/Posture

1Eastern Michigan University

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The present study assessed the affects of fatigue on balance in 16 males (mean age ± SD = 24 ± 3 y) with no orthopedic problems.

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Balance index (BI), fore/back ratio F/B), and right/left ratio (R/L) were determined using the Kinesthetic Ability Trainer (KAT 2000) system prior to (PRE), immediately (IMMED) and 10 minutes (10MIN) following serial Wingate tests and at the same time points under non-fatigue conditions. The results were statistically analyzed using MANOVA with repeated measures on condition and time. Further analyses included one-way ANOVA and dependent t-tests to discern in which variables any observed differences occurred and whether there was any effect of repeated testing.

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MANOVA revealed that there was a significant condition x time effect (p = 0.023), however, there was no significant effect of condition or time (p = 0.051 and 0.077, respectively). ANOVA revealed that only BI was significant for the condition, time, and condition x time effects (p = 0.020, 0.007, 0.003, respectively). Following the fatigue protocol, BI increased significantly from PRE-to-IMMED and decreased from IMMED-to-10MIN (p = 0.002 and p <0.001, respectively). BI was significantly different from the non-fatigue condition only for IMMED (p <0.001). In non-fatigue, there were significant improvements from PRE-to-10MIN (p = 0.03) indicating that there may be a learning effect when using the KAT 2000 system in the measurement of acute changes in balance parameters.

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It was concluded that fatigue adversely affects BI, however, recovery may occur within 10 min. These results may have application in sports where fatigue is a factor in the incidence of injury.

©2003The American College of Sports Medicine