Dynamic leg volume changes when sitting in a locked and free floating tilt office chair

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<title>Dynamic leg volume changes when sitting in a locked and free floating tilt office chair</title>
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<name type="personal" usage="primary" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080149550">
<namePart>Stranden, Einar</namePart>
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<dateIssued encoding="marc">2000</dateIssued>
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<abstract>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 stablish wheter a beneficial effect on the transcapillary fluid balance of the legs by enabling such mechanisms could be documented. The study showed that upward seat deflection was not associated with concominant 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.</abstract>
<note type="statement of responsibility">Einar Stranden</note>
<subject authority="lcshac" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080550653">
<topic>Ergonomía</topic>
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<subject authority="lcshac" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080610579">
<topic>Enfermedades pulmonares</topic>
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<subject authority="lcshac" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080622886">
<topic>Diseño del puesto de trabajo</topic>
</subject>
<subject authority="lcshac" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080542320">
<topic>Sillas</topic>
</subject>
<subject authority="lcshac" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080625238">
<topic>Análisis de puestos de trabajo</topic>
</subject>
<subject authority="lcshac" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080566869">
<topic>Pletismógrafo</topic>
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<subject authority="lcshac" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080571689">
<topic>Confortabilidad</topic>
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<subject authority="lcshac" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080545048">
<topic>Postura</topic>
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<subject authority="lcshac" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080610821">
<topic>Extremidades inferiores</topic>
</subject>
<classification authority="">875</classification>
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<title>Ergonomics</title>
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<publisher>London [etc.]</publisher>
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<part>
<text>Vol. 43 nº 3, March 2000 ; p. 421-433</text>
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