Document Detail


Perceived standing position after reduction of foot-pressure sensation by cooling the sole.
MedLine Citation:
PMID:  12776819     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We investigated the influence of the reduction of foot-pressure sensation by cooling the sole of the foot, at 1 degree C for 30 or 40 minutes, on the perception of standing position varied in the anteroposterior direction. The subjects were 16 healthy undergraduates. Firstly, for 4 of the subjects, cooling the sole of the foot decreased sensory information from the mechanoreceptors in the sole, by testing for an increase in the threshold for two-point discrepancy discrimination on the sole of the foot and for the disappearance of postural change with vibration to the sole. Next, the perception of standing position was measured by reproduction of a given standing reference position involving forward or backward leaning under both normal and cooled conditions of the feet. Standing position was varied in relation to the location of the center of foot pressure, defined as distance from the heel in percentage of the length of the foot. The reference positions, representing various locations of the center of foot pressure, were set at 10% increments from 20% to 80% of the length of the foot. With eyes closed, the subject first experienced the reference position and then attempted to reproduce it. The mean location of the center of foot pressure in the quiet standing posture was 45.7%. At the 40%, 50%, and 60% reference positions, those closest to quiet standing, absolute errors of reproduction were significantly larger than at other reference positions in both the normal and the cooled conditions. They were significantly larger in the cooled than in the normal condition. The 50% and 60% reference positions were reproduced significantly further forward in the cooled than in the normal condition. These results may be explained as due to an absence of marked changes in sensory information from both muscular activity and foot pressure when moving to reference positions close to the quiet standing posture.
Authors:
Katsuo Fujiwara; Hitoshi Asai; Akiyoshi Miyaguchi; Hiroshi Toyama; Kenji Kunita; Katsumi Inoue
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Perceptual and motor skills     Volume:  96     ISSN:  0031-5125     ISO Abbreviation:  Percept Mot Skills     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-06-02     Completed Date:  2003-09-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401131     Medline TA:  Percept Mot Skills     Country:  United States    
Other Details:
Languages:  eng     Pagination:  381-99     Citation Subset:  IM    
Affiliation:
Department of Human Movement and Health, Graduate School of Medical Science, Kanazawa University, Japan. fujikatu@med.kanazawa-u.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Adult
Cold Temperature*
Female
Foot*
Humans
Male
Mechanoreceptors / physiology
Posture*
Pressure*
Sensation*
Time Factors
Vibration

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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