Motor unit identification in two neighboring recording positions of the human trapezius muscle during prolonged computer work
نویسندگان
چکیده
منابع مشابه
Motor unit firing pattern in the trapezius muscle during long-term computer work
INTRODUCTION Muscle pain in the shoulder/neck area and the upper extremities is a common and increasing problem among computer workers (Öberg and Åström, 2000). Hägg (1991) formulated the “Cinderella” hypothesis, proposing that the pain is caused by an overuse of low-threshold motor units (MUs). While this hypothesis is supported by laboratory studies that showed continuous activity of single M...
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We examined the activity pattern of low-threshold motor units in the human trapezius muscle during contractions of 10 min duration. Three procedures were applied in sequence: 1) static contraction controlled by maintaining a constant low level of the surface electromyogram (EMG)-detected root-mean-square signal, 2) a manipulation task with mental concentration, and 3) copying a text on a word p...
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The aim of this laboratory study was to evaluate effects of active and passive pauses and investigate the distribution of the trapezius surface electromyographic (SEMG) activity during computer mouse work. Twelve healthy male subjects performed four sessions of computer work for 10 min in one day, with passive (relax) and active (30% maximum voluntary contraction of shoulder elevation) pauses g...
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INTRODUCTION Musculoskeletal disorders in the neck and shoulder regions of female computer users are a major occupational concern in the European countries and the incidence of disorders increases with age and hours of work per week. It has been reported that neck shoulder cases (NS-cases) compared to neck shoulder controls (NS-controls) have a significantly lower muscle strength and a lower mu...
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ژورنال
عنوان ژورنال: European Journal of Applied Physiology
سال: 2003
ISSN: 1439-6319,1439-6327
DOI: 10.1007/s00421-003-0821-7