NDLI: Relationship between selected measures of strength and hip and knee excursion during unilateral and bilateral landings in women.

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Relationship between selected measures of strength and hip and knee excursion during unilateral and bilateral landings in women.

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Relationship between selected measures of strength and hip and knee excursion during unilateral and bilateral landings in women.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	McCurdy, Kevin Walker, John Armstrong, Rusty Langford, George
Description	Country affiliation: Georgia Author Affiliation: McCurdy K ( 1Department of Health and Human Performance, Texas State University, San Marcos, Texas)
Abstract	The purpose of this study was to compare the relationship between several measures of single-joint, isometric, eccentric, and squat strength and unilateral and bilateral landing mechanics at the hip and knee in women. Twenty six healthy female subjects with previous athletic experience (height, 165.1 ± 7.01 cm; mass, 60.91 ± 7.14 kg; age, 20.9 ± 1.62 years) participated in this study. Hip and knee mechanics were measured using the MotionMonitor capture system (Innovative Sports Training, Inc.) with 3-dimensional electromagnetic sensors during bilateral (60 cm) and unilateral drop jumps (30 cm). On a separate day, isometric hip extension, external rotation, and abduction strength (lbs) were measured using a handheld dynamometer (Hoggan Health Industries, Inc.). Eccentric and isometric knee strength were measured on the Biodex IV Isokinetic Dynamometer (Biodex Medical Systems, Inc.). Free weight was used to measure the bilateral squat and a modified single-leg squat. The strongest correlations were found between squat strength and knee valgus (-0.77 ≤ r ≤ -0.83) and hip adduction (-0.5 ≤ r ≤ -0.65). After controlling for squat strength, hip external rotation strength and unilateral knee valgus (-0.41), hip abduction strength and bilateral knee valgus (-0.43), and knee flexion strength and bilateral hip adduction (-0.57) remained significant. Eccentric knee flexion strength and unilateral knee internal rotation was the only significant correlation for eccentric strength (-0.40). Squat strength seems to be the best predictor of knee valgus and was consistently related to hip adduction. Isometric and eccentric measures demonstrated few significant correlations with hip and knee excursion while demonstrating a low-to-moderate relationship. Hip and knee flexion and rotation do not seem to be related to strength. Squat strength should receive consideration during risk assessment for noncontact knee injury.
File Format	HTM / HTML
ISSN	10648011
Issue Number	9
Volume Number	28
e-ISSN	15334287
Journal	Journal of Strength and Conditioning Research
Language	English
Publisher	Lippincott Williams & Wilkins
Publisher Date	2014-09-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Sport Sciences Hip Joint Physiology Knee Joint Muscle Strength Biomechanical Phenomena Female Humans Knee Injuries Prevention & Control Movement Muscle, Skeletal Risk Assessment Rotation Young Adult Comparative Study Journal Article
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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