Document Detail


Duration of acute exposures to vibration and finger circulation.
MedLine Citation:
PMID:  9630061     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: This study investigated changes in finger circulation after different durations of exposure to hand-transmitted vibration. METHODS: Finger skin temperature (FST), finger blood flow (FBF), and finger systolic blood pressure (FSBP) were measured in the middle fingers of both hands of 10 healthy men. Finger vascular resistance was also estimated. The right hand was exposed for 7.5, 15, and 30 minutes (static load 10 N) to 125-Hz vibration (root-mean-square acceleration 87 m/s2). Static load only was used as a control. Finger circulation was measured before the vibration and static load exposure and at fixed intervals during exposure and a 45-minute recovery period. RESULTS: No significant changes were found with the static load. The FST and FSBP did not change significantly during vibration exposure, whereas vibration produced significant reductions in FBF and increases in vascular resistance at each duration when compared with preexposure and contralateral (non-vibrated) finger values. Temporary vasodilation occurred in the vibrated finger immediately after each vibration exposure. Recovery was complete for FBF and vascular resistance after the 7.5-minute vibration, whereas a progressive FBF reduction occurred in both the vibrated and the nonvibrated fingers after 15- and 30-minute exposure. The longer the duration of vibration exposure, the stronger the vasoconstriction in the vibrated finger during recovery. CONCLUSIONS: Vasoregulatory mechanisms mediated by both intrinsic (local) and extrinsic (neural or endocrine) control systems seem to be related to digital circulatory changes during 125-Hz vibration. It is concluded that, not only the frequency and magnitude of vibration, but also its duration contributes to the reaction of the digital vessels to acute vibration.
Authors:
M Bovenzi; C J Lindsell; M J Griffin
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Scandinavian journal of work, environment & health     Volume:  24     ISSN:  0355-3140     ISO Abbreviation:  Scand J Work Environ Health     Publication Date:  1998 Apr 
Date Detail:
Created Date:  1998-08-27     Completed Date:  1998-08-27     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7511540     Medline TA:  Scand J Work Environ Health     Country:  FINLAND    
Other Details:
Languages:  eng     Pagination:  130-7     Citation Subset:  IM    
Affiliation:
Institute of Occupational Medicine, University of Trieste, Italy. bovenzi@univ.trieste.it
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Flow Velocity / physiology
Fingers / blood supply*
Humans
Male
Middle Aged
Occupational Exposure / adverse effects*
Skin Temperature / physiology
Vasoconstriction / physiology
Vibration / adverse effects*

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


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