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Jan Wilke, Philipp Niemeyer, Daniel Niederer, Robert Schleip and Winfried Banzer

delineating the impact of FR on knee flexibility is clearly needed. Tissue stiffness was reduced following both FR interventions, which is a novel finding. An earlier study (unpublished data 15 ) of our research group failed to demonstrate an impact of FR on mechanical tissue properties. However, different

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Valerie J. Williams, Takashi Nagai, Timothy C. Sell, John P. Abt, Russell S. Rowe, Mark A. McGrail and Scott M. Lephart

Context:

Dynamic postural stability is important for injury prevention, but little is known about how lower-extremity musculoskeletal characteristics (range of motion [ROM] and strength) contribute to dynamic postural stability. Knowing which modifiable physical characteristics predict dynamic postural stability can help direct rehabilitation and injury-prevention programs.

Objective:

To determine if trunk, hip, knee, and ankle flexibility and strength variables are significant predictors of dynamic postural stability during single-leg jump landings.

Design:

Cross-sectional study.

Setting:

Laboratory.

Participants:

94 male soldiers (age 28.2 ± 6.2 y, height 176.5 ± 2.6 cm, weight 83.7 ± 26.0 kg).

Intervention:

None.

Main Outcome Measures:

Ankle-dorsiflexion and plantar-flexion ROM were assessed with a goniometer. Trunk, hip, knee, and ankle strength were assessed with an isokinetic dynamometer or handheld dynamometer. The Dynamic Postural Stability Index (DPSI) was used to quantify postural stability. Simple linear and backward stepwise-regression analyses were used to identify which physical characteristic variables were significant predictors of DPSI.

Results:

Simple linear-regression analysis revealed that individually, no variables were significant predictors of the DPSI. Stepwise backward-regression analysis revealed that ankle-dorsiflexion flexibility, ankle-inversion and -eversion strength, and knee-flexion and -extension strength were significant predictors of the DPSI (R 2 = .19, P = .0016, adjusted R 2 = .15).

Conclusion:

Ankle-dorsiflexion ROM, ankle-inversion and -eversion strength, and knee-flexion and -extension strength were identified as significant predictors of dynamic postural stability, explaining a small amount of the variance in the DPSI.

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.1123/jsr.2014-0333 Prediction of Dynamic Postural Stability During Single-Leg Jump Landings by Ankle and Knee Flexibility and Strength Valerie J. Williams * Takashi Nagai * Timothy C. Sell * John P. Abt * Russell S. Rowe * Mark A. McGrail * Scott M. Lephart * 8 2016 25 3 266 272 10.1123/jsr

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Matthew A. Wyon, Roger Wolman, Nicolas Kolokythas, Karen Sheriff, Shaun Galloway and Adam Mattiussi

– 2089 . PubMed ID: 27327027 doi:10.1249/MSS.0000000000001014 10.1249/MSS.0000000000001014 27327027 28. Williams VJ , Nagai T , Sell TC , et al . Prediction of dynamic postural stability during single-leg jump landings by ankle and knee flexibility and strength . J Sport Rehabil . 2016 ; 25

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Nathan F. Johnson, Chloe Hutchinson, Kaitlyn Hargett, Kyle Kosik and Phillip Gribble

, including flexibility. 6 Older adults with less knee flexibility take more time to rise from the floor. 11 The ability to sit and rise from the floor is a predictor of all-cause mortality, 12 but the effects of improved flexibility on the sit and rise maneuver are unknown. The sitting-rising test (S