Original Article
J Frailty Sarcopenia Falls. 2025 Jun; 10(2):54-61
The Effect of Muscle Strength and Visual Contrast Sensitivity on Fall Risk Sway Velocity Index Kyle J. Hackney, Miranda L. Bradley, Sean Mahoney, Nathaniel R. Johnson, Christopher J. Kotarsky, Adam P. Bradley, Sherri N. Stastny, Ryan McGrath, Mark E. McCourt
Keywords: Aging, Fall Risk, Sarcopenia, Strength, Visual Contrast Sensitivity
Full text Objectives The purpose of this study was to examine if fall risk scores were affected by the interaction between muscle strength and visual contrast sensitivity. Methods Ninety-one individuals aged 19-79 years completed assessments of knee extension strength, visual contrast sensitivity, and fall risk. Correlations and moderation analysis were completed in combination with analysis of variance. Data were categorized into groups: 1) higher strength-higher visual contrast sensitivity, 2) higher strength-lower visual contrast sensitivity; 3) lower strength- higher visual contrast sensitivity, and 4) lower strength-lower visual contrast sensitivity. Results Knee extension strength via peak torque relative to body mass (R= -0.57, P<0.001) and visual contrast sensitivity (R=-0.63, P<0.001) were both negatively correlated with age, while fall risk scores were positively correlated with age (R=0.34, P=0.001). The interaction between muscle strength and visual contrast sensitivity was a significant predictor of fall risk scores (t=2.420, P=0.018) when controlling for age. Participants exhibiting lower strength-lower contrast sensitivity (12.96±1.93) had significantly worse fall risk scores compared to higher strength-higher visual contrast sensitivity (11.53±1.75, P=0.045). Conclusion Lower levels of lower body muscle strength combined with lower visual contrast sensitivity interact to negatively influence fall risk.