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Source document position and neck muscle tension

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      <subfield code="a">Measurements of head position, mechanical load at C7, and level of muscle EMG activity in the muscles of the neck were compared across six document positions in both a reading task and typing task. Task design in this study was represented by a primary visual task</subfield>
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      <subfield code="g">Vol. 39, nº 4, April 1996 ; p. 593-610</subfield>
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