Dual-Task and anticipation impact lower limb biomechanics during a single-leg cut with body borne load

Publication date: Available online 25 October 2017
Source:Journal of Biomechanics
Author(s): Kayla D. Seymore, Sarah E. Cameron, Jonathan T. Kaplan, John W. Ramsay, Tyler N. Brown
This study quantified how a dual cognitive task impacts lower limb biomechanics during anticipated and unanticipated single-leg cuts with body borne load. Twenty-four males performed anticipated and unanticipated cuts with and without a dual cognitive task with three load conditions: no load (∼6kg), medium load (15% of BW), and heavy load (30% of BW). Lower limb biomechanics were submitted to a repeated measures linear mixed model to test the main and interaction effects of load, anticipation, and dual task. With body borne load, participants increased peak stance (PS) hip flexion (p = 0.004) and hip internal rotation (p = 0.001) angle, and PS hip flexion (p = 0.001) and internal rotation (p = 0.018), and knee flexion (p = 0.016) and abduction (p = 0.001) moments. With the dual task, participants decreased PS knee flexion angle (p < 0.001) and hip flexion moment (p = 0.027), and increased PS knee external rotation angle (p = 0.034). During the unanticipated cut, participants increased PS hip (p = 0.040) and knee flexion angle (p < 0.001), and decreased PS hip adduction (p = 0.001), and knee abduction (p = 0.005) and external rotation (p = 0.026) moments. Adding body borne load produces lower limb biomechanical adaptations thought to increase risk of musculoskeletal injury, but neither anticipation nor dual task exaggerated those biomechanical adaptations. With a dual task, participants adopted biomechanics known to increase injury risk; whereas, participants used lower limb biomechanics thought to decrease injury risk during unanticipated cuts.



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