The Interrelationship of the thorax and pelvis under varying task constraints

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<title>Interrelationship of the thorax and pelvis under varying task constraints</title>
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<namePart>Delphinusa, Elias M.</namePart>
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<abstract displayLabel="Summary">The purpose of this study was to investigate the interrelationship between the thorax and pelvis during coupled movement patterns. Fifty-seven participants were assessed using an infrared motion analysis system to track trunk movement during maximal pelvis and thorax rotations over four trunk inclinations and two pelvic constraint conditions. A repeated-measures multivariate analysis of variance investigated the effects of forward trunk inclination and pelvic constraint on thorax and pelvic rotation. Forward trunk inclination from neutral to 45° resulted in a 46% (p < 0.001) decrease in axial pelvic rotation and a 15% (p < 0.001) decrease in axial thorax rotation with an unconstrained pelvis. A constrained pelvis resulted in a 15% (p < 0.001) decrease in axial thorax rotation. An externally constrained pelvis allowed the thorax to achieve an average of 18° (SD = 2°) greater rotational range of motion across all angles. This study reinforced the importance of allowing the pelvis to rotate during whole body axial rotation tasks.</abstract>
<note type="statement of responsibility">Elias M. Delphinusa, Mark Gregory Leigh Sayersa</note>
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<title>Ergonomics : the international journal of research and practice in human factors and ergonomics</title>
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<publisher>Oxon [United Kingdom] : Taylor & Francis, 2010-</publisher>
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<identifier type="issn">0014-0139</identifier>
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<text>01/04/2013 Volumen 56 Número 4 - abril 2013 , p. 659-666</text>
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