Associations between trunk postural control in walking and unstable sitting at various levels of task demand

被引:8
作者
Acasio, Julian C. [1 ]
Butowicz, Courtney M. [1 ]
Golyski, Pawel R. [1 ]
Nussbaum, Maury A. [2 ]
Hendershot, Brad D. [1 ,3 ,4 ]
机构
[1] Walter Reed Natl Mil Med Ctr, Dept Rehabil, Res & Dev Sect, Bethesda, MD 20889 USA
[2] Virginia Tech, Dept Ind & Syst Engn, Blacksburg, VA USA
[3] DoD VA Extrem Trauma & Amputat Ctr Excellence, San Diego, CA USA
[4] Uniformed Serv Univ Hlth Sci, Dept Rehabil Med, Bethesda, MD 20814 USA
关键词
Center of pressure; Sample entropy; Lyapunov exponents; Biomechanics; Trunk stability; LOW-BACK-PAIN; LOCAL DYNAMIC STABILITY; KINEMATIC VARIABILITY; APPROXIMATE ENTROPY; BALANCE; SPEED; GAIT; STROKE; FALLS; RISK;
D O I
10.1016/j.jbiomech.2018.05.006
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
Trunk postural control (TPC) has been investigated in several populations and tasks. Previous work observed targeted training of TPC via isolated trunk control tasks may improve performance in other activities (e.g., walking). However, the nature of this relationship remains unknown. We therefore investigated the relationship between TPC, at both the global (i.e., response to finite perturbations) and local (i.e., resistance to continuous perturbations) levels, during walking and unstable sitting, both at varying levels of task demand. Thirteen individuals (11 Male, 2 Female) with no recent history (past 12 months) of illness, injury, or musculoskeletal disorders walked on a dual-belt treadmill at four speeds (-20%, -10%, +10%, and + 20% of self-selected walking speed) and completed an unstable sitting task at four levels of chair instability (100, 75, 60, and 45% of an individual's "neutral" stability as defined by the gravitational gradient). Three-dimensional trunk and pelvic kinematics were collected. Tri-planar Lyapunov exponents and sample entropy characterized local TPC. Global TPC was characterized by ranges of motion and, for seated trials, metrics derived from center-of-pressure time series (i.e., path length, 95% confidence ellipse area, mean velocity, and RMS position). No strong or significant correlations (-0.057 < p < 0.206) were observed between local TPC during walking and unstable sitting tasks. However, global TPC declined in both walking and unstable sitting as task demand increased, with a moderate inter task relationship (0.336 < p < 0.544). While the mechanisms regulating local TPC are inherently different, global TPC may be similarly regulated across both tasks, supporting future translation of improvements in TPC between tasks. Published by Elsevier Ltd.
引用
收藏
页码:181 / 185
页数:5
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