Reliability and Validity of a Wii Balance Board-Based Nordic Hamstring Test for Assessing Eccentric Hamstring Strength

Objective: This study evaluated the reliability and validity of the Nordic Hamstring Test (NHT) performed using a Wii Balance Board (WBB) for assessing eccentric hamstring strength, compared with a conventional isokinetic dynamometer (CSMI).Design: Cross-sectional validation study.Methods: Twenty-eight healthy young adults participated.Each performed three trials of the WBB-based NHT and eccentric knee extension testing using the CSMI at 60 /s.Peak force and peak torque values were recorded and normalized to body weight.Reliability and validity were evaluated using standard statistical analyses. Results:The WBB-NHT demonstrated excellent within-session reliability.Peak force measured by the WBB-NHT showed significant positive correlations with peak torque obtained from the CSMI.A significant mean difference between the two measurement methods was observed.Conclusions: The WBB-based NHT provides reliable and valid measures of relative eccentric hamstring strength in healthy young adults.Its low cost and portability suggest that it may be a practical assessment tool in clinical and sports settings.