Lower-extremity joint contributions during forward step-up, lateral step-up and forward step-down exercises

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dc.contributor.authorChinkulpraser, C.en_US
dc.contributor.authorVachalathiti, R.en_US
dc.contributor.authorChris, P.en_US
dc.contributor.authorChatchada Chinkulpraseren_US
dc.contributor.authorRoongtiwa Vachalathitien_US
dc.contributor.authorPowers Chrisen_US
dc.contributor.authorชัชฎา ชินกุลประเสริฐen_US
dc.contributor.authorรุ่งทิวา วัจฉละฐิติen_US
dc.contributor.authorคริส พาวเวอร์en_US
dc.contributor.otherMahidol University. Faculty of Physical Therapyen_US
dc.date.accessioned2014-01-28T05:55:16Z
dc.date.accessioned2018-10-04T07:16:14Z
dc.date.available2014-01-28T05:55:16Z
dc.date.available2018-10-04T07:16:14Z
dc.date.created2013-05-15
dc.date.issued2010-02-17
dc.descriptionThe Faculty of Physical Therapy, Mahidol University Annual Conference 2010, Thailand. 14 July 2010en_US
dc.description.abstractABSTRACT BODY: Purpose/Hypothesis: Stepping exercises are commonly used in the rehabilitation of the lower extremity. Knowledge of the biomechanical and muscular demands of various stepping tasks may assist clinicians in the appropriate selection of such exercises. The purpose of this study was to characterize the lower-extremity joint moments and muscle recruitment patterns during forward step-up (FSU), lateral step-up (LSU) and forward step-down (FSD) exercises. Number of Subjects: Nineteen healthy young adults between the ages of 18 and 35. Materials/Methods: Lower extremity kinematics and electromyographic (EMG) activity of the gluteus maximus, quadriceps (vastus medialis and lateralis), hamstrings (biceps femoris, semimembranosus, semitendinosus), and medial gastrocnemius muscles were obtained during forward step-up (FSU), lateral step-up (LSU) and forward step-down (FSD) tasks. The step height for each subject was standardized allowing a knee flexion angle of 45°. Each subject randomly performed each step exercise (3 trials of 5 repetitions) at a fixed speed (1 second up and 1 second down). Kinematic, kinetic and EMG data were computed using visual 3D software and EMG analysis software (Motion Lab Systems, Inc). Data were averaged from the 3 trials. Differences in mean values of average hip extensor, knee extensor, ankle plantar flexor moment and percent maximum voluntary isometric contraction (%MVIC) of each muscle were compared across stepping exercises using separate one-way ANOVA’s with repeated measures. This analysis was repeated for both the concentric and eccentric phases. The Least Significant Difference Method was used for the post hoc analysis. Significance levels were set at p<0.05. Results: For both the concentric and eccentric phases, FSU resulted in greater hip extensor moments compared to the LSU and FSD (P<0.001) whereas FSD resulted in greater knee extensor and ankle plantar flexor moments compared to the LSU (p<0.05) and FSU (p<0.05). In general, the EMG findings were consistent with the kinetic data. A significantly greater gluteus maximus activity was found during the FSU when compared to LSU and FSD (p=0.001). This difference was observed for the concentric phase only. With respect to the quadriceps, greater activity was observed during the FSD compared to the LSU (concentric and eccentric phases). Similarly, a greater medial gastrocnemius activity was found during the FSD as compared to the LSU and FSU (concentric and eccentric phases). Conclusions: FSU places a greater muscular demand on the hip extensors whereas FSD places a greater muscular demand on the knee extensors and ankle plantar flexors. Clinical Relevance: Clinicians may use FSU to maintain or improve hip extensor performance, while the FSD is recommended for improving knee extensor and ankle plantar flexor muscle performanceen_US
dc.identifier.urihttps://hdl.handle.net/20.500.14594/30105
dc.language.isoengen_US
dc.rightsMahidol Universityen_US
dc.rights.holderThe Combined Sections Meeting for the American Physical Therapy Association (APTA) (CSM 2010), San Diego, California, USA, 17-20 February 2010, USAen_US
dc.subjectStepping exercisesen_US
dc.subjectJoint contributionsen_US
dc.subjectEMGen_US
dc.titleLower-extremity joint contributions during forward step-up, lateral step-up and forward step-down exercisesen_US
dc.title.alternativeการวิเคราะห์ทางชีวกลศาสตร์และการทำงานของกล้ามเนื้อในขณะออกกำลังกายแบบก้าวขึ้นลงทางด้านหน้า ด้านข้าง และด้านหลังen_US
dc.typeProceeding Abstracten_US
mods.location.urlhttp://www.pt.mahidol.ac.th/web_pdf/research53/p53-lower.pdf
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