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Identification of aging effects on the control of upright stance using a local maximum wavelet transform method.

Authors
Zhang-HB; Nussbaum-MA
Source
Proceedings of the Human Factors and Ergonomics Society 51st Annual Meeting, October 1-5, 2007, Baltimore, Maryland. Santa Monica, CA: Human Factors and Ergonomics Society, 2007 Oct; 51(1):40-44
NIOSHTIC No.
20041017
Abstract
The purpose of this study was to investigate aging effects on the mechanisms of postural control during upright stance, and specifically the use of proprioceptive feedback on this control. Thirty-two healthy individuals participated, equally divided among younger (19-22 years) and older groups (54-68 years) and genders. Experimental trials involved several sessions of quiet stance on a firm surface with eyes closed. Center of pressure (COP) data were obtained from a force platform and processed using a new local maximum wavelet transform method. The critical time interval (CTI) derived from this method was proposed to describe the activation period of proprioceptive function, which is mainly influenced by the proprioceptive feedback loop. A reduced CTI was assumed to indicate poorer control based on proprioceptive input. Results showed that younger participants' CTI significantly increased from the first experimental session to consecutive experimental sessions in both the mediolateral (ML) and anteroposteriorer (AP) directions. However, older participates' CTI did not exhibit significant differences between the first and the consequent experimental sessions in either direction. This result suggests that the adaptability of proprioceptive function was impaired with age. Younger adults' CTIs were significantly larger than those of older adults in both ML and AP directions, indicating that among older adults stance control based on proprioceptive function was significantly impaired due to aging.
Keywords
Posture; Humans; Men; Women; Age-groups; Musculoskeletal-system; Muscles; Muscle-physiology; Muscle-function; Physical-capacity; Physical-fitness; Physiological-factors; Physiological-function; Physiological-response; Physiology; Sensory-perceptual-processes
CODEN
PHFSDQ
Publication Date
20071001
Document Type
Conference/Symposia Proceedings
Funding Type
Grant
Fiscal Year
2008
NTIS Accession No.
NTIS Price
ISBN No.
9788945289308
Identifying No.
Grant-Number-R01-OH-007882
Issue of Publication
1
ISSN
1071-1813
Source Name
Proceedings of the Human Factors and Ergonomics Society 51st Annual Meeting, October 1-5, 2007, Baltimore, Maryland
State
VA
Performing Organization
Virginia Polytechnic Institute and State University
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