Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7237027 | Journal of Biomechanics | 2017 | 26 Pages |
Abstract
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 (â¼6â¯kg), 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 (pâ¯=â¯.004) and hip internal rotation (pâ¯=â¯.001) angle, and PS hip flexion (pâ¯=â¯.001) and internal rotation (pâ¯=â¯.018), and knee flexion (pâ¯=â¯.016) and abduction (pâ¯=â¯.001) moments. With the dual task, participants decreased PS knee flexion angle (pâ¯<â¯.001) and hip flexion moment (pâ¯=â¯.027), and increased PS knee external rotation angle (pâ¯=â¯.034). During the unanticipated cut, participants increased PS hip (pâ¯=â¯.040) and knee flexion angle (pâ¯<â¯.001), and decreased PS hip adduction (pâ¯=â¯.001), and knee abduction (pâ¯=â¯.005) and external rotation (pâ¯=â¯.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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Authors
Kayla D. Seymore, Sarah E. Cameron, Jonathan T. Kaplan, John W. Ramsay, Tyler N. Brown,