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pubmed-article:16263128pubmed:dateCreated2006-10-30lld:pubmed
pubmed-article:16263128pubmed:abstractTextA non-invasive in vivo technique was developed to evaluate changes in wrist joint stability properties induced by increased co-activation of the forearm muscles in a gripping task. Mechanical vibration at 45, 50 and 55 Hz was applied to the radial head in ten healthy volunteers. Vibrations of the styloid process of the radius and the distal end of the metacarpal bone of the index finger were measured with triaxial accelerometers. Joint stability properties were quantified by the transfer function gain between accelerations on either side of the wrist-joint. Gain was calculated with the muscles at rest and at five force levels ranging from 5% to 25% of maximum grip force (%MF). During contraction the gain was significantly greater than in control trial (0%MF) for all contractions levels at 45 and 50 Hz and a trend for 15%MF and higher at 55 Hz. Group means of contraction force and gain were significantly correlated at 45 (R(2)=0.98) and 50 Hz (R(2)=0.72), but not at 55 Hz (R(2)=0.10). In conclusion, vibration transmission gain may provide a method to evaluate changes in joint stability properties.lld:pubmed
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pubmed-article:16263128pubmed:authorpubmed-author:van DieënJ...lld:pubmed
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pubmed-article:16263128pubmed:authorpubmed-author:FelthamM GMGlld:pubmed
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pubmed-article:16263128pubmed:dateRevised2009-11-11lld:pubmed
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pubmed-article:16263128pubmed:year2006lld:pubmed
pubmed-article:16263128pubmed:articleTitleChanges in joint stability with muscle contraction measured from transmission of mechanical vibration.lld:pubmed
pubmed-article:16263128pubmed:affiliationInstitute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit, Amsterdam, Van Der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands.lld:pubmed
pubmed-article:16263128pubmed:publicationTypeJournal Articlelld:pubmed
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