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Our aim is to test an etiological model derived from a theory by Van Galen and Van Huygevoort [<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#bib59\">2000<\/jats:ext-link>] Biol Psychol 51:151\u2013171. The theory holds that physical, emotional, and psychosocial stressors enhance muscular stiffness as a compensatory filtering of impoverished signal\u2010to\u2010noise ratios in the motor system. High individual levels of arousal, as measured by Spielberger et al. [<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#bib51\">1970<\/jats:ext-link>], State and Trait Anxiety Test would further enhance a subject's predisposition to react with stiffness responses in conditions of stress.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Ten participants with a high\u2010 and 10 with a low trait\u2010anxiety score performed a computer task involving series of fast but well\u2010dosed accelerations of the forearm along the surface of a digitizer. To induce cognitive stress a tone had to be remembered simultaneously with the aiming task. Pen\u2010tip displacements and surface electromyographic (EMG) signals were recorded from four forearm muscles.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Memory load did not affect error rates but produced shorter reaction times and prolonged movement times. EMG data show that under stress overall levels of neuromotor activation were enhanced. High\u2010anxious participants exhibited higher cocontraction levels than low\u2010anxious participants.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The findings support the view that stress and muscular tension are closely related and may provide a clue to the origin of WRUEDs. Am. J. Ind. 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