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BioMed Research International
Volume 2014, Article ID 819615, 10 pages
http://dx.doi.org/10.1155/2014/819615
Research Article

Measurement of Bed Turning and Comparison with Age, Gender, and Body Mass Index in a Healthy Population: Application of a Novel Mobility Detection System

1Department of Physical Therapy and Assistive Technology, National Yang Ming University, No. 155, Sec. 2, Linong Street, Beitou, Taipei City 112, Taiwan
2Department of Physical Medicine and Rehabilitation, School of Medicine, National Defense Medical Center, No. 325, Sec. 2, Chenggong Road, Neihu District, Taipei City 114, Taiwan
3Department of Physical Medicine and Rehabilitation, Tri-Service General Hospital, No. 325, Sec. 2, Chenggong Road, Neihu District, Taipei City 114, Taiwan
4Graduate Institute of Medical Sciences, National Defense Medical Center, No. 325, Sec. 2, Chenggong Road, Neihu District, Taipei City 114, Taiwan
5Department of Nursing, Tri-Service General Hospital, School of Nursing, National Defense Medical Center, No. 325, Sec. 2, Chenggong Road, Neihu District, Taipei City 114, Taiwan
6Department of Physical Medicine and Rehabilitation, Taichung Veterans General Hospital, No. 1650, Sec. 4, Taiwan Boulevard, Xitun District, Taichung City 407, Taiwan

Received 18 December 2013; Accepted 28 March 2014; Published 29 April 2014

Academic Editor: Ali I. Abdalla

Copyright © 2014 Shang-Lin Chiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We developed a mobility detection system to analyze pressure changes over time during side-turns in 29 healthy volunteers (17 males and 12 females) with a mean age of 46.1 ± 19.64 years (ranging from 23 to 86 years) in order to determine the effect of gender, age, and BMI on performance during bed postural change. Center of gravity (COG) location, peak pressure of counteraction, and time to reach peak pressure were the main outcomes used to gauge the ability to make a spontaneous side-turn. Men exhibited significantly higher side-turning force ( ) and back-turning force ( ) compared with women. Subjects with BMI ≥27 kg/m2 had significantly higher side-turning force ( ) and back-turning force ( ) compared with those with BMI < 27 kg/m2. After adjusting for other covariates, age positively correlated with back-turning time ( ) and negatively correlated with side-turning speed ( ), back-turning speed ( ), side-turning force ( ), and back-turning force ( ), respectively. Turning times negatively correlated with time to reach peak pressure ( ). Our system was effective in detecting changes in turning swiftness in the bed-ridden subject.