The Changes of lumbar muscle flexionrelaxation response due to laterally slanted ground surfaces

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      <subfield code="a">Hu, Boyi</subfield>
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      <subfield code="a">The Changes of lumbar muscle flexionrelaxation response due to laterally slanted ground surfaces</subfield>
      <subfield code="c">Boyi Hu, Xiaopeng Ninga, Ashish D. Nimbarte</subfield>
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      <subfield code="a">Lifting tasks performed on uneven ground surfaces are common in outdoor industries. Previous studies have demonstrated that lifting tasks performed on laterally slanted ground surfaces influence lumbar muscle activation and trunk kinematics. In this study, the effect of laterally slanted ground surfaces on the lumbar muscle flexionrelaxation responses was investigated. Fourteen participants performed sagittal plane, trunk flexionextension tasks on three laterally slanted ground surfaces (0° (flat ground), 15° and 30°), while lumbar muscle activities and trunk kinematics were recorded. Results showed that flexionrelaxation occurred up to 6.2° earlier among ipsilateral lumbar muscles with an increase in laterally slanted ground angle; however, the contralateral side was not affected as much. Our findings suggest that uneven ground alters the lumbar tissue load-sharing mechanism and creates unbalanced lumbar muscle activity, which may increase the risk of low back pain with repeated exposure to lifting on variable surfaces.</subfield>
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      <subfield code="t">Ergonomics : the international journal of research and practice in human factors and ergonomics</subfield>
      <subfield code="d">Oxon [United Kingdom] : Taylor & Francis, 2010-</subfield>
      <subfield code="x">0014-0139</subfield>
      <subfield code="g">05/08/2013 Volumen 56 Número 8 - agosto 2013 , p. 1295-1303</subfield>
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