Dual-task and anticipation impact lower limb biomechanics during a single-leg cut with body borne load |
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| Affiliation: | 1. Biomechanics Laboratory, Department of Kinesiology, University of Georgia, 330 River Rd, Athens, GA 30602, USA;2. School of Health, Physical Education and Recreation, University of Nebraska at Omaha, HPER Building 207Y, Omaha, NE 68182-0216, USA;1. NOVA Medical School, Lisbon NOVA University, Lisbon, Portugal;2. Hospital da Cruz Vermelha, Lisbon, Portugal;3. Department of Anatomy and Human Embryology, Faculty of Medicine, University of Barcelona, Spain, Portugal;4. Clínica do Dragão, Espregueira-Mendes Sports Centre – FIFA Medical Centre of Excellence, Porto, Portugal;5. Dom Henrique Research Centre, Porto, Portugal;6. Faculty of Sports, University of Porto, Porto, Portugal;7. Department of Orthopaedic Surgery, Hospital de Sant''Ana, Parede, Portugal;8. Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal;9. Human Performance Department, Sport Lisboa e Benfica, Lisboa, Portugal;10. Fisiogaspar, Lisboa, Portugal;11. Clínica do Dragão, Espregueira-Mendes Sports Centre – FIFA Medical Centre of Excellence, Porto, Portugal;12. Dom Henrique Research Centre, Porto, Portugal;13. ICVS/3B''s–PT Government Associate Laboratory, Braga, Guimarães, Portugal;14. School of Medicine, University of Minho, Braga, Portugal;15. NOVA Medical School, Lisbon NOVA University, Lisbon, Portugal;16. Director of the Orthpaedic Department at CHLO - S F Xavier Central Hospital, Lisbon, Portugal |
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| 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 (∼6 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 (p = .004) and hip internal rotation (p = .001) angle, and PS hip flexion (p = .001) and internal rotation (p = .018), and knee flexion (p = .016) and abduction (p = .001) moments. With the dual task, participants decreased PS knee flexion angle (p < .001) and hip flexion moment (p = .027), and increased PS knee external rotation angle (p = .034). During the unanticipated cut, participants increased PS hip (p = .040) and knee flexion angle (p < .001), and decreased PS hip adduction (p = .001), and knee abduction (p = .005) and external rotation (p = .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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| Keywords: | Kinematics Kinetics Decision-making Attention Load carriage |
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