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Cognitive Demands Influence Lower Extremity Mechanics During a Drop Vertical Jump Task in Female Athletes.
Related Articles

Cognitive Demands Influence Lower Extremity Mechanics During a Drop Vertical Jump Task in Female Athletes.

J Orthop Sports Phys Ther. 2018 Jan 10;:1-22

Authors: Almonroeder TG, Kernozek T, Cobb S, Slavens B, Wang J, Huddleston W

Abstract
Study Design Cross-sectional study. Background The drop vertical jump task is commonly used in anterior cruciate ligament injury risk screening; however, the predictive validity is limited. Part of the limited predictive validity may be because the drop vertical jump task does not impose cognitive demands that reflect sports participation. Objectives To investigate the influence of additional cognitive demands on lower extremity mechanics during execution of the drop vertical jump task. Methods Twenty uninjured females (ages 18-25 years old) were required to perform the standard drop vertical jump task, as well as drop vertical jumps which included additional cognitive demands. The additional cognitive demands were related to attending to an overhead goal (ball suspended overhead) and/or temporal constraints on movement selection ('decision-making'). Three-dimensional ground reaction forces and lower extremity mechanics were compared between conditions. Results The inclusion of the overhead goal resulted in higher peak vertical ground reaction forces and lower peak knee flexion angles in comparison to the standard drop vertical jump task. In addition, participants demonstrated greater peak knee abduction angles when trials incorporated temporal constraints on decision-making and/or required participants to attend to an overhead goal, in comparison to the standard drop vertical jump task. Conclusion Imposing additional cognitive demands during execution of the drop vertical jump task influenced lower extremity mechanics in a manner that may increase anterior cruciate ligament loading. Tasks utilized in anterior cruciate ligament injury risk screening may benefit from more closely reflecting the cognitive demands of the sports environment. J Orthop Sports Phys Ther, Epub 10 Jan 2018. doi:10.2519/jospt.2018.7739.

PMID: 29320946 [PubMed - as supplied by publisher]




The Influence of Exercise Dosing on Outcomes in Patients With Knee Disorders: A Systematic Review.
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The Influence of Exercise Dosing on Outcomes in Patients With Knee Disorders: A Systematic Review.

J Orthop Sports Phys Ther. 2018 Jan 10;:1-47

Authors: Young JL, Rhon DI, Cleland JA, Snodgrass SJ

Abstract
Study Design Systematic review. Background Therapeutic exercise is commonly used to treat individuals with knee disorders, but dosing parameters for optimal outcomes are unclear. Large variations exist in exercise prescription, and research related to specific dosing variables for knee osteoarthritis, patellar tendinopathy and patellofemoral pain syndrome is sparse. Objectives To identify specific doses of exercise related to improved outcomes of pain and function in individuals with common knee disorders, categorized by effect size. Methods Five electronic databases were searched for studies related to exercise and the three diagnoses. Means and standard deviations were used to calculate effect sizes for the exercise groups. The overall quality of evidence was assessed using the Physiotherapy Evidence Database scale. Results 583 studies were found after the initial search, and 45 were included for analysis of after screening. PEDro scores were 'fair' quality and ranged from 3-8. For knee osteoarthritis, 24 total therapeutic exercise sessions and an 8 and 12 week duration of exercise were parameters most often associated with large effects. An exercise frequency of once per week was associated with no effect. No trends were seen with exercise dosing for patellar tendinopathy and patellofemoral pain syndrome. Conclusion This review suggests there is clinically relevant exercise dosing variables that result in improved pain and function for patients with knee osteoarthritis, but optimal dosing is still unclear for patellar tendinopathy or patellofemoral pain syndrome. Prospective studies investigating dosing parameters are needed to confirm the results from this systematic review. Level of Evidence Therapy, level 1a. J Orthop Sports Phys Ther, Epub 10 Jan 2018. doi:10.2519/jospt.2018.7637.

PMID: 29320945 [PubMed - as supplied by publisher]