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  • 1.
    Halilovic, Armin
    KTH, School of Technology and Health (STH), Naturvetenskapliga avdelningen (Closed 20130701).
    Multilinear Stieltjes Integral in Banach Spaces1991In: Radovi Matematički, ISSN ISSN: 0352-6100, Vol. 7, no 2, 305-316 p.Article in journal (Refereed)
    Abstract [en]

    In this article we introduce a multilinear Stieltjes integral for functions with values in Banach spaces. The existence is considered in the sense of Riemann-Stieltjes, Moore-Pollard and Young in the case where the functions are regular and at least one of them is of bounded variation. The integral may exist even when the functions have common points of discontinuity (which differs from the situation in the scalar case)

  • 2. Milerad, E
    et al.
    Ericson, Mats O
    KTH, School of Technology and Health (STH), Ergonomics.
    Nisell, R
    Kilbom, A
    An electromyographic study of dental work.1991In: Ergonomics, ISSN 0014-0139, E-ISSN 1366-5847, Vol. 34, no 7, 953-62 p.Article in journal (Refereed)
    Abstract [en]

    Musculoskeletal disorders are common among dentists, and have been ascribed to the demands of high precision work and sustained static loading in the neck-shoulder region, combined with a flexed and rotated cervical spine. In order to determine muscular load levels during dentistry, activity in neck, shoulder, and arm muscles was recorded using an electromyography technique (EMG). Normalized mean, median, 10th and 90th percentile EMG amplitude levels (% maximal reference contraction, %max-RVC) were calculated during ordinary dental work. Among the muscles investigated, the trapezius muscle on both sides had the highest mean (the right trapezius 9.0% and the left 7.6% of max-RVC) and 10th percentile amplitude levels (both about 2% of max-RVC). The trapezius muscles showed similar myoelectric activity on the right and left side, probably because of similar muscular static load on the both sides. The right extensor carpi radialis muscle had a significantly higher muscular load level than the left one, possibly due to stabilization demands on the dominant wrist during demanding precision work. The infraspinatus muscle had low activity level on both sides, reflecting that the dentists worked with a small degree of arm elevation and external rotation. The dentistry work thus seems to generate relatively high muscular load on both trapezius and dominant extensor-carpi-radialis, and relatively low load on the infraspinatus muscle.

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