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Principal component analysis of kinematic patterns variability during sit to stand in people with non-specific chronic low back pain

Mehravar, M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1142/S0219519412400015
  3. Publisher: 2012
  4. Abstract:
  5. Sit to stand (STS) task requires variability of all body segments to achieve the stability of the important control variables (i.e., center of mass (CM) and head positions). In this study, the possible differences in the variability patterns of various body segments were investigated between 11 chronic low back pain (LBP) and 12 control subjects during STS task through two types of variability analyses; first by calculating the variability of seven limb angles, CM and head positions across 15 trials and second by principal component analysis (PCA) of seven limb angles. Participants performed the task at 3 postural difficulty levels: rigid surface, open eyes (RO), rigid surface, close eyes (RC) and narrow surface, close eyes (NC). The results revealed that LBPs could stabilize the CM and head positions same as controls. Also there was more than 1 synergic combination of whole body segments in both LBP and healthy groups. But the number of PCs accounting for the major part of variance was reduced in the LBPs in the most unstable phase of movement (50%80% trajectory) in the RO and RC conditions. This may indicate that LBPs have reduced flexibility in the most unstable phase of task
  6. Keywords:
  7. Body segment ; Center of mass ; Chronic low back pain ; Control subject ; Control variable ; Head position ; Kinematic patterns ; Low back pain ; movement variability ; Rigid surfaces ; Sit-to-stand ; Unstable phase ; Variability analysis ; Variability patterns ; Whole body ; Condensed matter physics ; Mechanical engineering ; Principal component analysis
  8. Source: Journal of Mechanics in Medicine and Biology ; Volume 12, Issue 2 , 2012 ; 02195194 (ISSN)
  9. URL: http://www.worldscientific.com/doi/abs/10.1142/S0219519412400015