Analysis of Knee Imbalance by Localized Muscular Resistance With Elastic Bands and Its Relationship With Functional Variables

OBJECTIVE: To evaluate the hamstrings-to-quadriceps (H:Q) ratio of the knee of young adults, measured by localized muscular resistance (LMR) with elastic bands, and its relationship with functional performance, muscle activation, postural balance, and plantar pressure. DESIGN: Cross-sectional observational study. METHODS: Thirty-five participants were analyzed. The initial data collection consisted of performing the knee flexion-extension LMR test and evaluated by an application called LMR, based on isokinetic data and developed by our research group. Associated tests were performed: hop tests, electromyography, and baropodometry. RESULTS: The findings show greater LMR for the extension movement, revealing the presence of muscle imbalance of 24.03% and 26.83% in the right and left limbs. The single hop test of the right (r = 0.344, P = 0.043) and left (r = 0.343; r = 0.044) limbs correlated with the H:Q ratio; the electromyography of the left rectus femoris (r = 0.362, P = 0.033), with the left H:Q ratio; the mass distribution with blindfolded eyes, negatively anterior (r = −0.342, P = 0.045) and posterior (r = 0.345, P = 0.042). CONCLUSION: The findings are consistent that the H:Q ratio measured by LMR correlates with functional performance by the single hop test, the muscular activation of the rectus femoris, and the anterior and posterior body mass distribution. JOSPT Methods 2026;2(1):9-18. Epub 15 October 2025. doi:10.2519/josptmethods.2025.0006