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  • 101.
    Sjölander, Per
    University of Gävle, Belastningsskadecentrum.
    Motor dysfunctions in chronic neck pain2004In: International Congress on Chronic Pain and Dysfunction after Whiplash and other Traumatic Neck Injuries, 2004, p. 11-15Conference paper (Refereed)
  • 102.
    Sjölander, Per
    et al.
    University of Gävle, Belastningsskadecentrum.
    Michaelson, Peter
    University of Gävle, Belastningsskadecentrum.
    Djupsjöbacka, Mats
    University of Gävle, Belastningsskadecentrum.
    Proprioceptive signature of cursive writing in humans2004In: Proceedings of the 8th International Federation of Orthopaedic Manupulative Therapists' Conference IFOMT: Cape Town, South Africa, March 21-26, 2004Conference paper (Other (popular science, discussion, etc.))
  • 103.
    Sjölander, Per
    et al.
    University of Gävle, Belastningsskadecentrum.
    Michaelson, Peter
    University of Gävle, Belastningsskadecentrum.
    Djupsjöbacka, Mats
    University of Gävle, Belastningsskadecentrum.
    Sensorimotor control and kinematics during neck rotations in patients with whiplash associated disorders and work-related neck pain2004In: Proceedings of the 8th International Federation of Orthopaedic Manipulative Therapists' Conference IFOMT Conference: Cape Town, South Africa, March 21-26, 2004Conference paper (Other (popular science, discussion, etc.))
  • 104. Svendsen, S W
    et al.
    Mathiassen, S E
    University of Gävle, Belastningsskadecentrum.
    Bonde, J P
    Task based exposure assessment in ergonomic epidemiology: a study of upper arm elevation in the jobs of machinists, car mechanics, and house painters.2005In: Occupational and Environmental Medicine, ISSN 1351-0711, E-ISSN 1470-7926, Vol. 62, no 1, p. 18-27Article in journal (Refereed)
    Abstract [en]

    AIMS: To explore the precision of task based estimates of upper arm elevation in three occupational groups, compared to direct measurements of job exposure. METHODS: Male machinists (n = 26), car mechanics (n = 23), and house painters (n = 23) were studied. Whole day recordings of upper arm elevation were obtained for four consecutive working days, and associated task information was collected in diaries. For each individual, task based estimates of job exposure were calculated by weighting task exposures from a collective database by task proportions according to the diaries. These estimates were validated against directly measured job exposures using linear regression. The performance of the task based approach was expressed through the gain in precision of occupational group mean exposures that could be obtained by adding subjects with task based estimates to a group of subjects with measured job exposures in a "validation" design. RESULTS: In all three occupations, tasks differed in mean exposure, and task proportions varied between individuals. Task based estimation proved inefficient, with squared correlation coefficients only occasionally exceeding 0.2 for the relation between task based and measured job exposures. Consequently, it was not possible to substantially improve the precision of an estimated group mean by including subjects whose job exposures were based on task information. CONCLUSIONS: Task based estimates of mechanical job exposure can be very imprecise, and only marginally better than estimates based on occupation. It is recommended that investigators in ergonomic epidemiology consider the prospects of task based exposure assessment carefully before placing resources at obtaining task information. Strategies disregarding tasks may be preferable in many cases

  • 105. Svendsen, Susanne Wulff
    et al.
    Gelineck, John
    Mathiassen, Svend Erik
    University of Gävle, Belastningsskadecentrum.
    Bonde, Jens Peter
    Frich, Lars Henrik
    Stengaard-Pedersen, Kristian
    Egund, Niels
    Work above shoulder level and degenerative alterations of the rotator cuff tendons: a magnetic resonance imaging study.2004In: Arthritis and rheumatism, ISSN 0004-3591, Vol. 50, no 10, p. 3314-22Article in journal (Refereed)
    Abstract [en]

    OBJECTIVE: To determine whether work performed with the arms in a highly elevated position is associated with alterations in the rotator cuff tendons as assessed by magnetic resonance imaging (MRI). METHODS: A cross-sectional study was performed in a historical cohort of male machinists, car mechanics, and house painters. The participants were right-handed, ages 40-50 years, and had been employed in their trades for not less than 10 years. Seventy-one percent of invited subjects participated (136 of 192). Lifetime upper arm elevation was assessed by direct measurements combined with individual work histories obtained by questionnaire and from registry data. Supraspinatus tendinopathy was evidenced by MRI signal intensity changes and morphologic alterations. Infraspinatus and subscapularis tendinopathy were also assessed. Additional outcomes were acromioclavicular joint degeneration and humeral head cysts. The MRI findings were evaluated by radiologists who were blinded to exposure status and symptoms. RESULTS: An exposure-response relationship was found between lifetime upper arm elevation and supraspinatus tendinopathy, with an age-adjusted odds ratio of 1.27 (95% confidence interval 1.02-1.60) for a 5-month increase in the total number of full-time working months spent with the arm elevated >90 degrees . CONCLUSION: Work with the arms in a highly elevated position is associated with MRI-diagnosed alterations in the supraspinatus tendon. By demonstrating the first part of a possible biologic pathway, the study corroborates the work-relatedness of rotator cuff disorders.

  • 106.
    Söderfjell, Stefan
    University of Gävle, Belastningsskadecentrum.
    Musculoskeletal pain, memory, and aging: cross-sectional and longitudinal findings2005Doctoral thesis, monograph (Other scientific)
  • 107.
    Thunberg, Johan
    et al.
    University of Gävle, Belastningsskadecentrum.
    Lyskov, Eugene
    University of Gävle, Belastningsskadecentrum.
    Korotkov, Alexander
    University of Gävle, Belastningsskadecentrum.
    Ljubisavljevic, Milos
    University of Gävle, Belastningsskadecentrum.
    Pakhomov, Sergey
    Katayeva, Galina
    Radovanovic, Sasa
    University of Gävle, Belastningsskadecentrum.
    Medvedev, Sviatoslav
    Johansson, Håkan
    University of Gävle, Belastningsskadecentrum.
    Brain processing of tonic muscle pain induced by infusion of hypertonic saline.2005In: European Journal of Pain, ISSN 1090-3801, E-ISSN 1532-2149, Vol. 9, no 2, p. 185-94Article in journal (Refereed)
    Abstract [en]

    Most of the previous studies on the effects of pain on Regional Cerebral Blood Flow (rCBF) had been done with brief cutaneous or intramuscular painful stimuli. The aim of the present study was to investigate the effect on rCBF of long lasting tonic experimental muscle pain. To this end we performed PET investigations ofrCBF following tonic experimentallow back pain induced by continuous intramuscular infusion ofhypertonic (5%) saline (HS) with computer controIled infusion pump into the right erector spinae on L3 level in 19 healthy volunteers. Changes in rCBF were measured with the use of 150 labelled water during four conditions: Baseline (before start of infusion), Early Pain (4 min after start of infusion), Late Pain (20 min after start of infusion) and Post Pain (> 15 min after stop of infusion) conditions.

    Results of S PM analysis showed relative rCBF increase in the right insula and bilateral decrease in the temporo-parieto-occipital cortex during initial phase of painful stimulation (Early Pain) followed by activation of the medial prefrontal region and bilateral inhibition ofinsula, anterior cingulat and dorso-lateral prefrontal cortex mainly in ipsilateral hemisphere during Late Pain conditions. The results show that longer lasting tonic experimental muscle pain elicited by i.m infusion ofHS results in decreases rather than increases in rCBF. Possible explanations for differences found in rCBF during tonic hypertonic saline-induced experimental muscle pain as compared with previous findings are discussed.

  • 108. van der Beek, Allard J
    et al.
    Mathiassen, Svend Erik
    University of Gävle, Belastningsskadecentrum.
    Windhorst, Judith
    Burdorf, Alex
    An evaluation of methods assessing the physical demands of manual lifting in scaffolding.2005In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 36, no 2, p. 213-222Article in journal (Refereed)
    Abstract [en]

    Four methods assessing the physical demands of manual lifting were compared. The scaffolding job was evaluated and three distinct scaffolding tasks were ranked using: (1) the revised NIOSH lifting equation (NIOSH method), (2) lifting guidelines for the Dutch construction industry (Arbouw method), (3) rapid appraisal of the NIOSH lifting equation (practitioners' method), and (4) systematic observations. For the three first-mentioned methods the same dataset was used; observation took place in a different setting in the same company. At job level, all methods indicated that ergonomic interventions are required to protect scaffolders from an increased risk for low back pain. The NIOSH, Arbouw and practitioners' method resulted in a similar ranking order of tasks (transport>construction>dismantlement). In contrast, the observational method gave transport the lowest ranking. The underlying cause was probably that the observational method is more sensitive to durations of tasks and lifting within tasks than the three other methods.

  • 109. Westerståhl, M
    et al.
    Barnekow-Bergkvist, Margareta
    University of Gävle, Belastningsskadecentrum.
    Jansson, E
    Low physical activity among adolescents in practical education.2005In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 15, no 5, p. 287-297Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to investigate physical activity levels and factors related to physical activity among 16-year old girls and boys in secondary school practical and theoretical programs. An additional aim was to identify factors contributing to differences in physical activity patterns between the educational programs. Sixteen-year old students in the first year of secondary school in Sweden (n = 585) were systematically selected and 93% agreed to complete a questionnaire. Compared with students in theoretical programs, those in practical programs spent less time and energy per day in physical activity. Girls in practical programs were the least physically active, and boys in theoretical programs the most physically active students. Statistical analysis showed that, among students in practical programs, the influence of educational program on physical activit y level was explained by lower socio-econornic level, less parental support, lower perceived health level, and negative attitudes towards outdoor physical activities. These data suggest that promotion of physical activity should focus on students, especially girls, in practical programs. Because the difference in physical activity levels between educational programs was partly an effect of less positive parental influence, school-based programs may be especially influential in increasing physical activity levels among secondary school students.

  • 110.
    Wiitavaara, Birgitta
    et al.
    University of Gävle, Belastningsskadecentrum.
    Lundman, B
    Barnekow-Bergkvist, Margareta
    University of Gävle, Belastningsskadecentrum.
    Brulin, Christine
    Experiences of illness, wellness and work environment of male ambulance personnel2005In: Proceedings of the 37th Annual Conference of the Nordic Ergonomics Society, 2005, p. 266-270Conference paper (Refereed)
    Abstract [en]

    This study explored experiences of illness, wellness and work environment of male ambulance personnel with musculoskeletal symptoms. A Grounded theory approach was applied with interviews with ten ambulance men parallel to analysis. Illness was experienced as threefold, with experiences of getting too vulnerable/hardened and getting worn-out beside experiences of bodily illness. Wellness was closely connected to their identity as both individuals and ambulance workers. To create stability and make sense of their illness experiences, the men performed an inner reasoning about extenuating circumstances to make illness acceptable; they also consciously worked out a strategy for handling their problems.

  • 111.
    Yu, Ji-Guo
    et al.
    University of Gävle, Belastningsskadecentrum.
    Carlsson, Lena
    Thornell, Lars-Eric
    University of Gävle, Belastningsskadecentrum.
    Evidence for myofibril remodeling as opposed to myofibril damage in human muscles with DOMS: an ultrastructural and immunoelectron microscopic study.2004In: Histochemistry and Cell Biology, ISSN 0948-6143, E-ISSN 1432-119X, Vol. 121, no 3, p. 219-227Article in journal (Refereed)
    Abstract [en]

    The myofibrillar and cytoskeletal alterations observed in delayed onset muscle soreness (DOMS) caused by eccentric exercise are generally considered to represent damage. By contrast our recent immunohistochemical studies suggested that the alterations reflect myofibrillar remodeling (Yu and Thornell 2002; Yu et al. 2003). In the present study the same human muscle biopsies were further analyzed with transmission electron microscopy and immunoelectron microscopy. We show that the ultrastructural hallmarks of DOMS, Z-disc streaming, Z-disc smearing, and Z-disc disruption were present in the biopsies and were significantly more frequent in biopsies taken 2-3 days and 7-8 days after exercise than in those from controls and 1 h after exercise. Four main types of changes were observed: amorphous widened Z-discs, amorphous sarcomeres, double Z-discs, and supernumerary sarcomeres. We confirm by immunoelectron microscopy that the main Z-disc protein alpha-actinin is not present in Z-disc alterations or in the links of electron-dense material between Z-discs in longitudinal register. These alterations were related to an increase of F-actin and desmin, where F-actin was present within the strands of amorphous material. Desmin, on the other hand, was seen in less dense regions of the alterations. Our results strongly support that the myofibrillar and cytoskeletal alterations, considered to be the hallmarks of DOMS, reflect an adaptive remodeling of the myofibrils

  • 112. Yu, Ji-Guo
    et al.
    Carlsson, Lena
    Thornell, Lars-Eric
    University of Gävle, Belastningsskadecentrum.
    Evidence for myofibrillar remodeling as opposed to myofibril damage in muscles with DOMS2004In: APS Intersociety Meeting, The Integrative Biology of Exercise, 2004Conference paper (Other (popular science, discussion, etc.))
123 101 - 112 of 112
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