David R Howell1, Gregory D Myer2, Dustin Grooms3, Jed Diekfuss2, Weihong Yuan4, William P Meehan5. 1. Sports Medicine Center, Children's Hospital Colorado, Aurora, CO; Department of Orthopedics, University of Colorado School of Medicine, Aurora, CO; The Micheli Center for Sports Injury Prevention, Waltham, MA. Electronic address: David.Howell@ucdenver.edu. 2. The SPORT Center, Division of Sports Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH. 3. Ohio Musculoskeletal & Neurological Institute and Division of Athletic Training, School of Applied Health Sciences and Wellness, College of Health Sciences and Professions, Ohio University, Athens, OH. 4. Pediatric Neuroimaging Research Consortium, Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH; University of Cincinnati College of Medicine, Cincinnati, OH. 5. The Micheli Center for Sports Injury Prevention, Waltham, MA; Division of Sports Medicine, Boston Children's Hospital, Boston, MA; Departments of Orthopaedic Surgery and Pediatrics, Harvard Medical School, Boston, MA.
Abstract
OBJECTIVES: (1) To determine the effects of concussion-related motor impairments at different task complexities in isolation and with a cognitive dual-task and (2) to determine if self-reported balance deficits after concussion are associated with gait, quiet stance, or cognitive dual-task impairments. DESIGN: Cross-sectional study. SETTING: Sports medicine clinic. PARTICIPANTS: Adolescent athletes clinically diagnosed with a sport-related concussion and those without concussion. Forty-nine patients with concussion (mean age=14.9±1.9y; 51% female; tested 7.0±3.0d postinjury) and 65 control participants (mean age=14.9±1.6y; 52% female) completed the study (N=114). INTERVENTIONS: Athletes with concussion completed a single-task and dual-task standing and walking protocol within 14 days of injury and were compared to those without concussion. MAIN OUTCOME MEASURES: Outcome measures included gait speed, quiet stance (root mean square [RMS] coronal/sagittal plane sway), and cognitive performance (accuracy). Dual-task costs were calculated as the percentage change between single-task and dual-task conditions. Participants with concussion were then stratified by those who did and did not report subjective balance problems at the time of testing and compared using objective balance and gait metrics. RESULTS: The concussion group walked slower during dual-task gait than controls (0.83±0.17 m/s vs 0.92±0.15 m/s; Cohen's d=0.53). Dual-task quiet stance RMS sway values were similar for concussion and control groups in coronal (1.20±0.52 m/s-2 vs 1.26±0.65 m/s-2; d=0.09) and sagittal (0.56±0.24 m/s-2 vs 0.73±0.44 m/s-2; d=0.20) movement planes. The concussion participants with subjectively-reported balance problems had significantly greater walking speed dual-task costs than concussion participants without self-reported balance problems (-25±10% vs -19±9%; P=.02). CONCLUSIONS: Following concussion, adolescents demonstrate slower gait speeds, but similar quiet stance values relative to those without concussion. The study results indicate that tasks requiring greater motor coordination may elicit greater alterations following a concussion.
OBJECTIVES: (1) To determine the effects of concussion-related motor impairments at different task complexities in isolation and with a cognitive dual-task and (2) to determine if self-reported balance deficits after concussion are associated with gait, quiet stance, or cognitive dual-task impairments. DESIGN: Cross-sectional study. SETTING: Sports medicine clinic. PARTICIPANTS: Adolescent athletes clinically diagnosed with a sport-related concussion and those without concussion. Forty-nine patients with concussion (mean age=14.9±1.9y; 51% female; tested 7.0±3.0d postinjury) and 65 control participants (mean age=14.9±1.6y; 52% female) completed the study (N=114). INTERVENTIONS: Athletes with concussion completed a single-task and dual-task standing and walking protocol within 14 days of injury and were compared to those without concussion. MAIN OUTCOME MEASURES: Outcome measures included gait speed, quiet stance (root mean square [RMS] coronal/sagittal plane sway), and cognitive performance (accuracy). Dual-task costs were calculated as the percentage change between single-task and dual-task conditions. Participants with concussion were then stratified by those who did and did not report subjective balance problems at the time of testing and compared using objective balance and gait metrics. RESULTS: The concussion group walked slower during dual-task gait than controls (0.83±0.17 m/s vs 0.92±0.15 m/s; Cohen's d=0.53). Dual-task quiet stance RMS sway values were similar for concussion and control groups in coronal (1.20±0.52 m/s-2 vs 1.26±0.65 m/s-2; d=0.09) and sagittal (0.56±0.24 m/s-2 vs 0.73±0.44 m/s-2; d=0.20) movement planes. The concussion participants with subjectively-reported balance problems had significantly greater walking speed dual-task costs than concussion participants without self-reported balance problems (-25±10% vs -19±9%; P=.02). CONCLUSIONS: Following concussion, adolescents demonstrate slower gait speeds, but similar quiet stance values relative to those without concussion. The study results indicate that tasks requiring greater motor coordination may elicit greater alterations following a concussion.
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