TITLE

Quantitative Analysis of the Limits of Stability in Sitting

AUTHOR(S)
Preuss, Richard A.; Popovic, Milos R.
PUB. DATE
August 2010
SOURCE
Journal of Applied Biomechanics;Aug2010, Vol. 26 Issue 3, p265
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This study defines the limits of stability in sitting, and quantitatively assesses two measures of postural control relative to these limits. Young, healthy subjects sat, feet unsupported, on an elevated force plate. The limits of stability were determined by a least square fit of an ellipse to the center of pressure (CoP) excursion during maximal leaning in 8 directions. These were highly symmetrical and centered within the base of support. The ellipses had a mean eccentricity of 0.66 (major axis in the sagittal plane) and covered an area approx. 1/3 of the base of support. The CoP was then monitored over 4 min of quiet sitting, during which the postural sway covered an area <0.05% of the limits of stability and was closely centered within the latter. Finally, targetdirected trunk movements were performed, in 5 directions, at 4 movement speeds and 3 target distances. Increased target distance and movement speed both decreased the margin of stability (distance between the CoP and the limits of stability), as did movement in the frontal plane, reflecting the eccentricity of the limits of stability. These combined findings support the validity of this quantitative method of defining the limits of stability in sitting, for healthy individuals.
ACCESSION #
53565892

 

Related Articles

  • Responses of the Trunk to Multidirectional Perturbations During Unsupported Sitting in Normal Adults. Thrasher, T. Adam; Sin, Vivian W.; Masani, Kei; Vette, Albert H.; Craven, B. Cathy; Popovic, Milos R. // Journal of Applied Biomechanics;Aug2010, Vol. 26 Issue 3, p332 

    Understanding how the human body responds to unexpected force perturbations during quiet sitting is important to the science of motor behavior and the design of neuroprostheses for sitting posture. In this study, the performance characteristics of the neck and trunk in healthy individuals were...

  • Dynamic Optimization of the Sit-to-Stand Movement. Yamasaki, Hiroshi R.; Kambara, Hiroyuki; Koike, Yasuharu // Journal of Applied Biomechanics;Nov2011, Vol. 27 Issue 4, p306 

    The purpose of this study was to clarify criteria that can predict trajectories during the sit-to-stand movement. In particular, the minimum jerk and minimum torque-change models were examined. Three patterns of sit-to-stand movement from a chair, i.e., upright, natural, and leaning forward,...

  • Kinematic Analysis of Selected Reach Directions of the Star Excursion Balance Test Compared With the γ-Balance Test. Fullam, Karl; Caulfield, Brian; Coughlan, Garrett F.; Delahunt, Eamonn // Journal of Sport Rehabilitation;Feb2014, Vol. 23 Issue 1, p27 

    Context: The Star Excursion Balance Test (SEBT) and the Y-Balance Test (YBT) have 3 common reach directions: anterior (ANT), posteromedial (PM), and posterolateral (PL). Previous research has indicated that reachdistance performance on the ANT reach direction of the SEBT differs from that on the...

  • Effects of Repetitive Reaching Movements on Performance and Postural Control. SAITO, HIROSHI; KOMINAMI, YUI; YAMANAKA, MASANORI; TAKEDA, NAOKI; FUKUSHIMA, JUNKO // Journal of Physical Therapy Science;2011, Vol. 23 Issue 4, p569 

    The article offers information on the study conducted by the authors related to the effects of repetitive reaching movements on performance and postural control. It states that the study included fourteen healthy subjects, who were attempted to reach a small target as fast as possible while...

  • Characteristics of Postural Muscle Activation Patterns Induced by Unexpected Surface Perturbations in Elite Ski Jumpers. HIROKO MANI; TATSUYA IZUMI; TOMOYA KONISHI; MINA SAMUKAWA; KEIZO YAMAMOTO; KAZUHIKO WATANABE; TADAYOSHI ASAKA // Journal of Physical Therapy Science;2014, Vol. 26 Issue 6, p833 

    [Purpose] This study investigated the characteristics of postural control following postural disturbance in elite athletes. [Subjects] Ten elite ski jumpers and ten control subjects participated in this study. [Methods] Subjects were required to maintain balance without stepping following...

  • Postural Stability of Sitting Women. Nag, Pranab K.; Vyas, Heer; Nag, Anjali; Pal, Swati // International Journal of Occupational Safety & Ergonomics;2013, Vol. 19 Issue 4, p583 

    The study examined the utility of stabilometric dimensions and explored whether the changes in sitting postures were manifested in functional measures of postural control. Eleven women participated in the study, which used 11 chair sitting postures: arms on laps or arms right angled; armrest at...

  • Kinematic and Kinetic Indicators of Sit-to-Stand. Stevermer, Catherine A.; Gillette, Jason C. // Journal of Applied Biomechanics;Feb2016, Vol. 32 Issue 1, p7 

    Variation in the timing indicators separating sit-to-stand (STS) into movement phases complicates both research comparisons and clinical applications. The purpose of this study was to use kinetic reference standards to identify accurate kinematic and kinetic indicators for STS movement analysis...

  • Leg Dominance May Not Be a Predictor of Asymmetry in Peak Joint Moments and Ground Reaction Forces During Sit-to-Stand Movements. Schofield, Jonathon S.; Parent, Eric; Lewicke, Justin; Carey, Jason P.; El-Rich, Marwan; Adeeb, Samer // Journal of Applied Biomechanics;Feb2014, Vol. 30 Issue 1, p179 

    Sit-to-stand transfer is a common prerequisite for many daily tasks. Literature often assumes symmetric behavior across the left and right side. Although this assumption of bilateral symmetry is prominent, few studies have validated this supposition. This pilot study uniquely quantifies peak...

  • The Effect of Fixed Ankle and Knee Joints on Postural Stability and Muscle Activity. Lee, Daehee; Lee, Sangyoung; Park, Jungseo; Roh, Hyolyun // Journal of Physical Therapy Science;Jan2013, Vol. 25 Issue 1, p33 

    The article discusses study to examine postural stability and muscle activity when limitations were placed on the ankle and knee joints. It also discusses methods and data were analyzed using (Statistical Product and Service Solutions) SPSS version 18.0. Results were drawn and it was concluded...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics