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Do ankle braces provide similar effects on ankle biomechanical variables in subjects with and without chronic ankle instability during landing?

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Journal of Sport and Health Science 2012年第2期1卷 114-120页

作者： Songning Zhang Michael Wortley Julia Freedman Silvernail Daniel Carson Maxime R.Paquette Biomechanics/Sports Medicine Laboratory Department of KinesiologyRecreation and Sport StudiesThe University of TennesseeKnoxvilleTN 37934.USA Pellissippi State Community College KnoxvilleTN 37933USA Department of Kinesiology University of MassachusettsAmherstMA 01003USA Biomechanics/Sports Medicine Laboratory Department of KinesiologyRecreation and Sport StudiesThe University of TennesseeKnoxvilleTN 37934USA

Purpose:The purpose of this study was to examine effects of a sport version of a semi-rigid ankle brace (ElementTM) and a soft ankle brace (ASO) on ankle biomechanics and ground reaction forces (GRFs) during a drop landing activity in subjects with chronic ankle instability (CAI)compared to healthy subjects with no history of ***:Ten healthy subjects and 10 subjects who had multiple ankle sprains participated in the study as the control and unstable subjects,*** CAI subjects were age,body mass index and gender matched with the control *** arch index and ankle functions of the subjects were measured in a subject screening *** the biomechanical test session,participants performed five trials of drop landing from 0.6 m,wearing no brace ( NB),ElementTM brace and ASO *** recording of three-dimensional kinematic (240 Hz)and GRF (1200 Hz) data were ***:The CAI subjects had lower ankle functional survey *** arch index and deformity results showed greater arch deformity of ElementTM against a static load than in NB and ASO due to greater initial arch position held by the *** participants had greater eversion velocity than healthy *** ASO brace reduced the first peak vertical GRF whereas ElementTM increased 2nd peak vertical *** brace reduced eversion range of motion (ROM) and peak eversion velocity compared to NB and *** addition,ElementTM reduced dorsiflexion ROM and increased peak plantarflexion moment compared to NB and ***:Results of static arch measurements and dynamic ankle motion suggest that the restrictions offered by both braces are in part due to more dorsiflexed ankle positions at contact,and higher initial arch position and stiffer ankle for ElementTM.

关键词： drop landing Lateral ankle sprain Recurrent ankle sprain Semi-rigid ankle brace Soft ankle brace

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Effect of a combined inversion and plantarflexion surface on ankle kinematics and EMG activities in landing

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Journal of Sport and Health Science 2015年第4期4卷 377-383页

作者： Divya Bhaskaran Michael Wortley Qingjian Chen Clare E. Milner Eugene C. Fitzhugh Songning Zhang Physical Rehabilitation Science Program Department of Physical Therapy and Rehabilitation Science University of Minnesota Minneapolis MN 55455 USA Department of Exercise Science Wellness and Sports Georgian Court University Lakewood Township NJ 08701 USA Department of Kinesiology University of Maryland College Park MD 20742 USA Department of Physical Therapy and Rehabilitation Science Drexel University Philadelphia PA 19104 USA Biomechanics/Sports Medicine Laboratory Department of Kinesiology Recreation and Sport Studies The University of Tennessee Knoxville TN 37996 USA

Purpose： The purpose of this study was to examine the effects of landing kinematics and electromyographic （EMG） activities of medial gastrocnemius on a combined inversion and plantarflexion surface on the ankle （MG）, peroneus longus （PL）, and tibialis anterior （TA） muscles. Methods： Twelve recreational athletes performed five drop landings from an overhead bar of 30 cm height on to three surfaces： a flat surface, a 25° inversion surface, and a combined surface of 25° inversion and 25° plantarflexion. The kinematic variables and integrated EMG （IEMG） of the three muscles were assessed using a one-way repeated measures ANOVA and a 3 × 3 （surface × muscle） ANOVA, respectively （p 〈 0.05）. Results： The IEMG results showed a significant muscle by surface interaction. The flat surface induced higher TA activity than the two tilted surfaces. The inverted surface produced significantly higher inversion peak angle and velocity than the flat surface, but similar PL activity across the surfaces. The MG IEMG, ankle plantarflexion angle, and inversion range of motion were significantly higher for the combined surface compared to the inverted surface. Conclusion： These findings suggest that compared to the inversion surface, the combined plantarflexion and inversion surface seems to provide a more unstable surface condition for lateral ankle sprains during landing.

关键词： drop landing Electromyography Inversion Lateral ankle sprain Plantarftexion

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