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  • 1.
    Crenshaw, Albert
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
    Elcadi, Guilherme
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
    Reproducibility and gender comparisons of oxygenation, blood flow and oxygen consumption for the forearm2010In: Medicine & Science in Sports & Exercise, ISSN 0195-9131, E-ISSN 1530-0315, Vol. 42, no 5, p. 384-385Article in journal (Other academic)
  • 2.
    Crenshaw, Albert G
    et al.
    University of Gävle, Belastningsskadecentrum.
    Heiden, Marina
    University of Gävle, Belastningsskadecentrum.
    Lyskov, Eugene
    University of Gävle, Belastningsskadecentrum.
    Johansson, Håkan
    University of Gävle, Belastningsskadecentrum.
    Reduced muscular oxygenation during computer mouse use with time pressure and precision demands2004In: Medicine & Science in Sports & Exercise, ISSN 0195-9131, E-ISSN 1530-0315, Vol. 35, no 5, p. S221-S222Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    Monitoring oxidative metabolic states may provide information on the mechanism behind computer use related musculoskeletal disorders. PURPOSE: To compare tissue oxygen saturation (Sat-O2) profiles in the forearm extensor carpi radialis (ECR) during computer mouse use with and without time pressure and precision demands. METHODS: Twenty-four healthy, right-handed subjects (12 females, 12 males; age 19-28 years) participated in the study. Subjects performed a 45-min mouse operated computer task on two occasions, separated by 3-5 days. The task consisted of painting squares that were presented on the screen. On one occasion, time pressure and precision demands were imposed by limiting the time available for painting a square and introducing a scoring system based on precision of painting (STRESS). On the other occasion, no such restraints were added (NON-STRESS). The order of the two task versions was randomized. During the task, Sat-O2 in the right ECR muscle was measured by near-infrared spectroscopy – NIRS (Inspectra, Hutchinson Technology). In addition, subjective ratings of tenseness and strain, and painting performance measures were recorded. RESULTS: A repeated measures ANOVA revealed a significant decline in Sat-O2 during the STRESS condition (p < 0.05), but no change for the NON-STRESS condition. A gender difference was apparent as females exhibited an overall lower Sat-O2 than males (p < 0.05); however, no interaction was found. Subjectsメ ratings of tenseness and strain were significantly higher during the STRESS as compared to the NON-STRESS condition (p < 0.001). These data were paralleled by work pace (i.e. squares painted during STRESS = 119; NON-STRESS = 84, p < 0.001). Furthermore, accuracy of painting was greater for the STRESS as compared to the NON-STRESS condition (p < 0.01), i.e., number of times outside the square, STRESS = 2, NON-STRESS = 4. No gender differences in subjective ratings or performance variables were detected. CONCLUSIONS: Our finding of a change in local metabolic states under stressful conditions may shed light on the mechanism behind computer mouse related forearm muscular disorders. Furthermore, that females demonstrate a lower ECR Sat-O2 could give precedence to their higher incidence of disorders than males

  • 3.
    Crenshaw, Albert
    et al.
    University of Gävle, Centre for Musculoskeletal Research.
    Komandur, Sashidharan
    Department of Environmental and occupational Health Sciences, University of Washington, Seattle.
    Johnson, Peter W
    Department of Environmental and occupational Health Sciences, University of Washington, Seattle.
    Contractile properties and hemodynamics for a sustained submaximal contraction studied with electrical stimulation and NIRS2009In: Medicine & Science in Sports & Exercise, ISSN 0195-9131, E-ISSN 1530-0315, Vol. 41, no 5, p. 220-221Article in journal (Refereed)
  • 4.
    Pedersen, Jonas
    et al.
    Arbetslivsinstitutet.
    Lönn, Johan
    Arbetslivsintitutet.
    Hellström, Fredrik
    Idrottsmedicin, Umeå universitet och Arbetslivsinstitutet.
    Djupsjöbacka, Mats
    Arbetslivsinstitutet.
    Johansson, Håkan
    Arbetslivsinstitutet.
    The effects of localized muscle fatigue on the movement sense in the dominant human shoulder1998In: Medicine & Science in Sports & Exercise, ISSN 0195-9131, E-ISSN 1530-0315Article in journal (Refereed)
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