Comparison of Knee Flexion Angles for Maintaining Dynamic Balance on Negative Slopes: A Guide for Improving Postural Stability in Mountain Climbing and Downhill Walking

OBJECTIVE: The purpose of this study was to compare the dynamic balance at different knee flexion angles (maximal knee flexion angles of 30° and 45°) on a 20% negative slope. METHODS: In an observational cross-sectional study, 19 healthy male participants performed a modified Star Excursion Balance Test on a 20% negative slope, whereas the left standing knee was restricted by a knee brace in a maximum of 30° or 45° flexion. RESULTS: The balance scores were significantly better in 45° knee flexion compared with 30° flexion in the composite reach and also in the percentage of reach in any of the test directions. CONCLUSION: On a 20% negative slope, 45° knee flexion resulted in better dynamic balance than 30° knee flexion.