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http://dx.doi.org/10.15268/ksim.2019.7.1.081

Correlation between Pelvic Tilt Angle with Trunk Motion and Trunk Extensor during Trunk Forward Flexion in Adults Aged 2,30  

Park, Youngju (Dept. of Physical Therapy, Graduate School of Clinical Pharmacy and Health, Kyungsung University)
Lee, Sangyeol (Dept. of Physical Therapy, Kyungsung University)
Publication Information
Journal of The Korean Society of Integrative Medicine / v.7, no.1, 2019 , pp. 81-88 More about this Journal
Abstract
Purpose : The purpose of this study was to examine if there is any correlation between pelvic tilt angle and trunk motion and trunk extensor during trunk forward flexion and to measure trunk motion, onset time of trunk motion, and onset time of trunk extensor activation. Methods : The subjects of this study were 42 healthy adults. The subjects had no back pain due to neurological disease and no experience of back surgery. After pelvic tilt angle was measured, each trunk forward flexion was performed three times. Trunk motion and onset time of trunk motion were measured using Myomotion. Four sensors were used, with one located at the upper thoracic (below $C_7$), the lower thoracic ($T_{12}-L_1$), the sacrum ($S_1$), and at the center of the anterior femur. Onset time of trunk extensors (spinalis, longissimus, gluteus medius, gluteus maximus, biceps femoris, and gastrocnemius) activation was measured using a wireless surface EMG. The EMG amplitude was normalized by using the reference voluntary contraction (RVC). The statistical significance of the results were evaluated using Pearson's correlation test. Results : The correlation between pelvic tilt angle and lumbar motion, onset time of pelvis motion, and onset time of gluteus medius activation was statistically significant in a positive direction (p<.05). The correlation between pelvic tilt angle with pelvis motion, onset time of lumbar motion, and onset time of longissimus activation showed a statistically significant negative correlation (p<.05). Conclusion : The study results provide a significant contribution to our understanding of the lumbar load at the initial stage of trunk flexion. Therefore, it may be possible to provide basic data for evaluation and treatment, such as orthodontic treatment for alignment of the spine and back pain. In addition, it is necessary to focus on normal exercise pattern reeducation as well as pelvic correction during exercise in daily life or in industrial fields.
Keywords
onset time of trunk extensor activation; pelvic tilt angle; trunk forward flexion; trunk motion;
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Times Cited By KSCI : 2  (Citation Analysis)
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