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The Relationship between Force Platform Measures and Total Body Center of Mass

Mihalik, Jason Peter (2004) The Relationship between Force Platform Measures and Total Body Center of Mass. Master's Thesis, University of Pittsburgh. (Unpublished)

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The ability of a person to maintain stable posture is essential for activities of daily living. Research in this field has evolved to include sensitive assessment technology including force platforms and 3-dimensional kinematic motion analysis systems. Although many studies have investigated postural stability under the auspice of posturography and the use of force platforms, relatively few have incorporated kinematic motion analysis techniques. Furthermore, of the studies that have utilized a multivariate research model, none have sought to identify the relationship between force platform measures including both the variation of movement of the x- and y-coordinates of the center of pressure (COP), and the 3-dimensional coordinates of the total body center of mass (COM). This study used a descriptive design to evaluate the relationship between force platform measures and the kinematic measures dealing with the total body COM in 14 healthy participants (height = 1.70 ± 0.09 m, mass = 67.7 ± 9.9 kg; age = 24.9 ± 3.8 yrs). Intraclass correlations (ICC) and standard error of measurements (SEM) were determined for common variables of interest used in standard posturography models. The results suggest that the variation of the excursion of the COP coordinates best represent the variation of the total body COM in the x- and y-directions. There was a force platform measure that correlated significantly with the vertical component of total body COM in only 3 of the 8 conditions. The ICC values obtained when analyzing individual conditions revealed that the variation in the force measurements were much more reliable than those representing the variation in movement of the COP, suggesting a need for the development of higher order methods of modeling 3-dimensional COM information from force platforms.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Mihalik, Jason
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairMyers, Joseph
Committee MemberLephart, Scott Mlephart@pitt.eduLEPHART
Committee MemberSell, Timothy Ctcs15@pitt.eduTCS15
Date: 10 December 2004
Date Type: Completion
Defense Date: 6 December 2004
Approval Date: 10 December 2004
Submission Date: 6 December 2004
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: School of Health and Rehabilitation Sciences > Health and Rehabilitation Sciences
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: balance; postural stability; posturography
Other ID:, etd-12062004-104131
Date Deposited: 10 Nov 2011 20:08
Last Modified: 15 Nov 2016 13:53


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