The Impacts Are Correlated Between Single-leg Drop Landing And Running Landing

Single-leg drop landing was adopted to examine landing technique for lower-limb injury prevention in many exercises [1-2]. Besides the periodic feature, running also shows similar landing movements. PURPOSE: This study aimed to examine the potential connection of the impact between single-leg drop landing and running landing. METHODS: 20 healthy adults performed single-leg drop landing with their dominant leg from a 30-cm box and run 50 m at their preferred speed (3.16-3.49 m/s) on four surfaces: concrete road (CR), synthetic rubber (SR), artificial grass (AG) and natural grass (NG). An inertial sensor was attached in the middle of the tibia of the dominant leg and peak tibial axial acceleration (PTA) was recorded to quantify the landing impact when performing the two tasks. RESULTS: A significant positive correlation was detected in PTA between the drop landing and running landing, and the model of predicting PTA during running (PTAdrop) based on the drop landing (PTArun) is: PTArun = 0.9728*PTAdrop + 23.09, (R2 = 0.6305; p < 0.0001). Regarding different surfaces, PTArun_CR = 1.257*PTAdrop_CR + 2.869, (R2 = 0.6314) for CR surface, PTArun_SR = 0.8708*PTAdrop_SR + 27.15, (R2 = 0.6481) for SR surface, PTArun_AG = 0.8836*PTAdrop_AG + 25.79, (R2 = 0.7011) for AG surface, and PTArun_NG = 1.113*PTAdrop_NG + 20.28, (R2 = 0.6739) for NG surface. CONCLUSION: The landing peak impact during running was highly correlated to that of the drop landing, which is robust to the landing surface. Similar motor control strategies may be adopted when one performs single-leg drop landing and running landing. Further studies are required to verify such explanations in the future. Fig 1. PTA between single-leg drop and running landings. Supported by the Innovation and Entrepreneurship Projects for Shenzhen University Students (P.Z.) and the China Scholarship Council (S.M.). REFERNCES:[1] Wernli et al. 2016. J Orthop Sports Phys Ther, 46(3), 194-9.[2] Hung Au et al. 2021. J Athl Train, 56(12), 1362-6. Supported by: Supported by the Innovation and Entrepreneurship Projects for Shenzhen University Students (P.Z.) and the China Scholarship Council (S.M.).