Document Detail


Dynamic leg volume changes when sitting in a locked and free floating tilt office chair.
MedLine Citation:
PMID:  10755663     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
It is well established that prolonged sitting may lead to swelling of the lower extremities. However, activation of the vein pump system by repeated walking breaks or dynamic tiltable foot-rests have been shown to reduce foot and leg oedema. Some office chairs incorporate tilt mechanisms facilitating movements of the body from the feet up. The present study was undertaken to establish whether a beneficial effect on the transcapillary fluid balance of the legs by enabling such mechanisms could be documented. An office chair where the tilt mechanism could be locked or open was used for the study. The seat position and seat activity level was recorded by a transducer system developed for the study. Calf volume and calf muscle pump activity was detected by mercury strain gauge plethysmography. In the locked position there was a steady increase in volume of mean = 1.2% (range = 0.8-1.8%) for all participants in the 30-min study period. On the other hand, for all participants there was a decrease in calf volume (mean = 0.7%, range = 0.1-1.2%, p = 0.008) when the tilt mechanism was open (30-min period), irrespective of what study period came first. The study showed that upward seat deflection was not associated with concomitant venous obstruction, since such obstruction was detected in less than 2% of the time period with more than 50% of maximal upward deflection. A locked seat mechanism does not prevent activation of the vein pump mechanism, but the study indicates that office chairs that permit variation in seat angle per se stimulate movements of the leg. This, in turn, activates vein pumps and counteracts local oedema formation in seated working postures.
Authors:
E Stranden
Related Documents :
3945823 - Symmetry in running.
10455533 - Comparison of asynchronous versus synchronous arm crank ergometry.
24715563 - Performance in the heat-physiological factors of importance for hyperthermia-induced fa...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ergonomics     Volume:  43     ISSN:  0014-0139     ISO Abbreviation:  Ergonomics     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-04-20     Completed Date:  2000-04-20     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0373220     Medline TA:  Ergonomics     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  421-33     Citation Subset:  IM; S    
Affiliation:
Department of Vascular Diagnosis and Research, Surgical Clinic, Aker University Hospital, Oslo, Norway. einar.stranden@ioks.uio.no
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Edema / etiology*,  physiopathology*
Equipment Design
Female
Human Engineering
Humans
Interior Design and Furnishings*
Leg / blood supply,  physiology*,  physiopathology*
Male
Middle Aged
Plethysmography
Posture*
Range of Motion, Articular
Water-Electrolyte Balance

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


Previous Document:  Endurance time, pain and resumption in passive loading of the elbow joint.
Next Document:  Ku autoantigen: a multifunctional DNA-binding protein.