Scaling of lifting forces in relation to object size in whole body lifting
Identifieur interne : 000647 ( PascalFrancis/Curation ); précédent : 000646; suivant : 000648Scaling of lifting forces in relation to object size in whole body lifting
Auteurs : Idsart Kingma [Pays-Bas] ; Jaap H. Van Dieën [Pays-Bas] ; Huub M. Toussaint [Pays-Bas]Source :
- Ergonomics [ 0014-0139 ] ; 2005.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Homme, Ergonomie, Manutention.
English descriptors
- KwdEn :
Abstract
Subjects prepare for a whole body lifting movement by adjusting their posture and scaling their lifting forces to the expected object weight. The expectancy is based on visual and haptic size cues. This study aimed to find out whether lifting force overshoots related to object size cues disappear or persist over a number of repeated lifts. In addition, the influence of the degree of alternation between load sizes, and the influence of knowledge of actual object weights prior to the lifts, were investigated with regard to their effect on force overshoots. Four experiments were performed using a large and a small box, each of 8.4 kg weight, and varying degrees of alternation between boxes. In two of the experiments, subjects were informed about the weight of the objects, while in the other two experiments they were not informed about the weight of the objects. When boxes were lifted 15 times before switching to the other box, rapid diminishing of force scaling errors was observed. However, when boxes were alternated each lift or after three lifts, persisting force scaling overshoots were found in lifting the large box compared to the small one. When participants were given information regarding the actual object weight, force overshoots in the first pair of large and small box lifts were not different from overshoots in experiments where subjects were not informed about the weight of the objects. This shows that, for occupational lifting, risks related to force overshoots in lifting large objects can persist despite experience in lifting the objects and despite the use of labels indicating the weight of the objects.
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Van Dieën</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9</s1><s2>1081 BT Amsterdam</s2><s3>NLD</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Pays-Bas</country></affiliation></author><author><name sortKey="Toussaint, Huub M" sort="Toussaint, Huub M" uniqKey="Toussaint H" first="Huub M." last="Toussaint">Huub M. 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Van Dieën</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9</s1><s2>1081 BT Amsterdam</s2><s3>NLD</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Pays-Bas</country></affiliation></author><author><name sortKey="Toussaint, Huub M" sort="Toussaint, Huub M" uniqKey="Toussaint H" first="Huub M." last="Toussaint">Huub M. Toussaint</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9</s1><s2>1081 BT Amsterdam</s2><s3>NLD</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Pays-Bas</country></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Academy of Physical Education, University of Professional Education</s1><s2>Amsterdam</s2><s3>NLD</s3><sZ>3 aut.</sZ></inist:fA14><country>Pays-Bas</country></affiliation></author></analytic><series><title level="j" type="main">Ergonomics</title><title level="j" type="abbreviated">Ergonomics</title><idno type="ISSN">0014-0139</idno><imprint><date when="2005">2005</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Ergonomics</title><title level="j" type="abbreviated">Ergonomics</title><idno type="ISSN">0014-0139</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ergonomics</term><term>Force</term><term>Handling</term><term>Human</term><term>Manual activity</term><term>Object</term><term>Posture</term><term>Professional activity</term><term>Risk factor</term><term>Size</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Force</term><term>Homme</term><term>Ergonomie</term><term>Manutention</term><term>Activité manuelle</term><term>Posture</term><term>Activité professionnelle</term><term>Facteur risque</term><term>Taille</term><term>Objet</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Homme</term><term>Ergonomie</term><term>Manutention</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Subjects prepare for a whole body lifting movement by adjusting their posture and scaling their lifting forces to the expected object weight. The expectancy is based on visual and haptic size cues. This study aimed to find out whether lifting force overshoots related to object size cues disappear or persist over a number of repeated lifts. In addition, the influence of the degree of alternation between load sizes, and the influence of knowledge of actual object weights prior to the lifts, were investigated with regard to their effect on force overshoots. Four experiments were performed using a large and a small box, each of 8.4 kg weight, and varying degrees of alternation between boxes. In two of the experiments, subjects were informed about the weight of the objects, while in the other two experiments they were not informed about the weight of the objects. When boxes were lifted 15 times before switching to the other box, rapid diminishing of force scaling errors was observed. However, when boxes were alternated each lift or after three lifts, persisting force scaling overshoots were found in lifting the large box compared to the small one. When participants were given information regarding the actual object weight, force overshoots in the first pair of large and small box lifts were not different from overshoots in experiments where subjects were not informed about the weight of the objects. This shows that, for occupational lifting, risks related to force overshoots in lifting large objects can persist despite experience in lifting the objects and despite the use of labels indicating the weight of the objects.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0014-0139</s0></fA01><fA02 i1="01"><s0>ERGOAX</s0></fA02><fA03 i2="1"><s0>Ergonomics</s0></fA03><fA05><s2>48</s2></fA05><fA06><s2>8</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Scaling of lifting forces in relation to object size in whole body lifting</s1></fA08><fA11 i1="01" i2="1"><s1>KINGMA (Idsart)</s1></fA11><fA11 i1="02" i2="1"><s1>VAN DIEËN (Jaap H.)</s1></fA11><fA11 i1="03" i2="1"><s1>TOUSSAINT (Huub M.)</s1></fA11><fA14 i1="01"><s1>Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9</s1><s2>1081 BT Amsterdam</s2><s3>NLD</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></fA14><fA14 i1="02"><s1>Academy of Physical Education, University of Professional Education</s1><s2>Amsterdam</s2><s3>NLD</s3><sZ>3 aut.</sZ></fA14><fA20><s1>1020-1030</s1></fA20><fA21><s1>2005</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>9268</s2><s5>354000138470670080</s5></fA43><fA44><s0>0000</s0><s1>© 2005 INIST-CNRS. 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