| 1. |
- Aspegren Kendall, Sally, 1950-, et al.
(författare)
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A pilot study of body awareness programs in the treatment of fibromyalgia syndrome
- 2000
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Ingår i: Arthritis Care and Research. - 0893-7524 .- 1529-0123. ; 13:5, s. 304-311
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Tidskriftsartikel (refereegranskat)abstract
- Objective. To compare in a pilot study the effect of two physical therapies, the Mensendieck system (MS) and body awareness therapy (BAT) according to Roxendal, in fibromyalgia patients and to investigate differences in effect between the two interventions. Methods. Twenty female patients were randomized to either MS or BAT in a program lasting 20 weeks. Evaluations were tender point examination and questionnaires, including visual analog scales (pain intensity at worst site, muscular stiffness, evening fatigue, and global health), Fibromyalgia Impact Questionnaire (FIQ), Coping Strategies Questionnaire, Quality of Life Scales, Arthritis Self-Efficacy Scale (ASES), and disability before, immediately after, and at 6 and 18 months followup. Results. The BAT group had improved global health at 18 months followup, but lower results than the MS group. The MS group had improved FIQ, ASES other symptoms, and pain at worst site at 18 months followup. Conclusion. In the present pilot study, MS was associated with more positive changes than BAT.
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| 2. |
- Aspegren Kendall, Sally, 1950-, et al.
(författare)
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Differences in sensory thresholds in the skin of women with fibromyalgia syndrome : A comparison between ketamine responders and ketamine non-responders
- 2003
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Ingår i: Journal of Musculoskeletal Pain. - 1058-2452 .- 1540-7012. ; 11:2, s. 3-9
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To compare detection and pain thresholds in the skin of female fibromyalgia patients who were either ketamine responders or ketamine nonresponders.Methods: Detection thresholds to innocuous warmth, of cold, heat or cold pain, and touch and dynamic touch sensation were determined in the skin. Pressure pain thresholds, local and widespread pain intensity, and pain duration were also registered.Results: Ketamine nonresponse was associated with more pronounced hypersensitivity for thermal pain [especially cold pain] than ketamine response.Conclusions: Blockade of N-metyl-D-aspartic acid receptors by ketamine and the recording of pain thresholds in the skin, especially for cold pain, might reveal different mechanisms of allodynia.
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| 3. |
- Gerdle, Björn, 1953-, et al.
(författare)
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Prevalence of current and chronic pain and their influences upon work and healthcare-seeking: A population study
- 2004
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Ingår i: Journal of Rheumatology. - 0315-162X .- 1499-2752. ; 31:7, s. 1399-1406
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Tidskriftsartikel (refereegranskat)abstract
- Objective. To investigate the prevalence of current and chronic pain and their relationship to pain intensity, sex, age, income, employment status, citizenship, marital status, urban residence, occupational activity, and healthcare-seeking based on a representative sample from a Swedish county. Methods. A cross-sectional survey using a postal questionnaire was sent to a representative sample (n = 9952) of the target population (284,073 people, age 18-74 yrs) in a county (Ostergotland) in southern Sweden. A questionnaire was mailed and followed by 2 postal reminders if necessary. Results. The participation rate was 76.7% (n = 7637); nonparticipants were on average younger, male, and earned less money. The overall point prevalence of pain was 48.9%. The corresponding one-month period prevalence was 63.0%, and pain on several occasions during the previous 3 months was reported by 61.3% of participants. The prevalence of chronic pain (pain > 3 months) was 53.7%. Female sex, age, and sick leave/early retirement were generally of significant importance in the regressions of pain. No sex factor was found in the regressions of pain frequency and pain intensity. Chronic pain - especially frequent and intensive pain - showed clear associations with healthcare-seeking and occupational activity. Conclusion. High prevalence of current pain (48.9%) and chronic pain (53.7%) were found in this community-based study. Being female, older, and on sick leave or early retirement were generally of significant importance in the regressions of pain. Chronic pain showed clear associations with healthcare-seeking and occupational activity, indicating considerable socioeconomic costs.
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| 4. |
- Graven-Nilsen, T, et al.
(författare)
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Ketamine reduces muscle pain, temporal summation, and referred pain in fibromyalgia patients
- 2000
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Ingår i: Pain. - 0304-3959 .- 1872-6623. ; 85:3, s. 483-491
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Tidskriftsartikel (refereegranskat)abstract
- Central mechanisms related to referred muscle pain and temporal summation of muscular nociceptive activity are facilitated in fibromyalgia syndrome (FMS) patients. The present study assessed the effects of an NMDA-antagonist (ketamine) on these central mechanisms. FMS patients received either i.v. placebo or ketamine (0.3 mg/kg, Ketalar(«)) given over 30 min on two separate occasions. Habitual pain intensity was assessed on a visual analogue scale (VAS). Initially, 29 FMS patients received ketamine or isotonic saline to determine which patients were ketamine responders (>50% decrease in pain intensity at rest by active drug on two consecutive VAS assessments). Fifteen out of 17 ketamine-responders were included in the second part of the study. Before and after ketamine or placebo, experimental local and referred pain was induced by intramuscular (i.m.) infusion of hypertonic saline (0.7 ml, 5%) into the tibialis anterior (TA) muscle. The saline-induced pain intensity was assessed on an electronic VAS, and the distribution of pain drawn by the subject. In addition, the pain threshold (PT) to i.m. electrical stimulation was determined for single stimulus and five repeated (2 Hz, temporal summation) stimuli. The pressure PT of the TA muscle was determined, and the pressure PT and pressure pain tolerance threshold were determined at three bilaterally located tenderpoints (knee, epicondyle, and mid upper trapezius). VAS scores of pain at rest were progressively reduced during ketamine infusion compared with placebo infusion. Pain intensity (area under the VAS curve) to the post-drug infusion of hypertonic saline was reduced by ketamine (-18.4▒0.3% of pre-drug VAS area) compared with placebo (29.9▒18.8%, P<0.02). Local and referred pain areas were reduced by ketamine (-12.0▒14.6% of pre-drug pain areas) compared with placebo (126.3▒83.2%, P<0.03). Ketamine had no significant effect on the PT to single i.m. electrical stimulation. However, the span between the PT to single and repeated i.m. stimuli was significantly decreased by the ketamine (-42.3▒15.0% of pre-drug PT) compared with placebo (50.5▒49.2%, P<0.03) indicating a predominant effect on temporal summation. Mean pressure pain tolerance from the three paired tenderpoints was increased by ketamine (16.6▒6.2% of pre-drug thresholds) compared with placebo (-2.3▒4.9%, P<0.009). The pressure PT at the TA muscle was increased after ketamine (42.4▒9.2% of pre-drug PT) compared with placebo (7.0▒6.6%, P<0.011). The present study showed that mechanisms involved in referred pain, temporal summation, muscular hyperalgesia, and muscle pain at rest were attenuated by the NMDA-antagonist in FMS patients. It suggested a link between central hyperexcitability and the mechanisms for facilitated referred pain and temporal summation in a sub-group of the fibromyalgia syndrome patients. Whether this is specific for FMS patients or a general phenomena in painful musculoskeletal disorders is not known. Copyright (C) 2000 International Association for the Study of Pain. Published by Elsevier Science B.V.
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| 5. |
- Henriksson, Björn, et al.
(författare)
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Control relevant identification of nonlinear systems using linear models
- 2001
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Ingår i: PROCEEDINGS OF THE 2001 AMERICAN CONTROL CONFERENCE. - 0780364953 ; , s. 1178-1183
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Konferensbidrag (refereegranskat)abstract
- In this contribution we consider control of nonlinear systems by means of linear time-invariant model based control design. It is shown that a desired closed loop response of the nonlinear system for a given reference signal can be achieved using a controller based on a linear model. This is possible if the linear model used in the control design is able to capture the input/output behaviour of the nonlinear system for the desired response. An identification method, designed for this purpose, is presented and illustrated on an numerical example.
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| 6. |
- Henriksson, Christian, et al.
(författare)
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Reducing Bluetooth Interference with Diversity Techniques in IEEE 802.11b Networks
- 2002
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Ingår i: Proceedings Nordic Signal Processing Symposium.
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Konferensbidrag (refereegranskat)abstract
- Lately different kinds of wireless networks have become more frequently used. If they occupy the same frequency band they are likely to interfere with each other. In this paper, we examine how spatial diversity can be exploited to suppress Bluetooth interference on a IEEE 802.11b network. Two dual antenna receivers, the maximum ratio combining (MRC) and the interference rejection combining (IRC) methods, have been evaluated and compared to the ordinary single antenna receiver. Simulation results show that adding spatial diversity yields a signicant reduction in biterror rate (BER) and as a consequence the throughput is increased, especially for larger fragment sizes.
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| 7. |
- Henriksson, Per, et al.
(författare)
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Safety and mobility of people with disabilities driving adapted cars
- 2004
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Ingår i: Scandinavian Journal of Occupational Therapy. - : Informa UK Limited. - 1103-8128 .- 1651-2014. ; 11:2, s. 54-61
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Tidskriftsartikel (refereegranskat)abstract
- A study was carried out to increase knowledge about the safety of drivers with disabilities. A questionnaire that focused on the driver's disability, the adaptive equipment, the use of the car, safety, and accident involvement was sent to a random sample of persons with disabilities driving adapted cars. Spinal cord injuries was the most frequent diagnosis (30% of 793 answers) and lower limb disabilities was the most common functional restriction (over 75%). The drivers felt very safe and they had a high level of confidence in the adapted car. They used the car for almost the entire distance travelled (90%), which illustrates how dependent this group is on the car for their mobility. About 1 out of 10 drivers had been involved in an accident during the last 3.5 years, most of them with only material damage. The accident and injury risks of the target group did not differ significantly from the risks of drivers in general. A small number of accidents were attributed to problems with the special equipment in the car. The causes could be unfamiliarity with the controls, an adaptation that did not fully meet the needs of the individual or equipment that broke down. © 2004 Taylor & Francis.
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| 8. |
- Larsson, Britt, et al.
(författare)
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The prevalences of cytochrome c oxidase negative and superpositive fibres and ragged-red fibres in the trapezius muscle of female cleaners with and without myalgia and of female healthy controls
- 2000
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Ingår i: Pain. - 1872-6623 .- 0304-3959. ; 84:2-3, s. 379-387
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Tidskriftsartikel (refereegranskat)abstract
- The association of cytochrome c oxidase negative fibres (COX-negative) and ragged-red fibres (RR-fibres) with work related trapezius myalgia has been proposed. Hitherto studies have been small or without control groups. The aim of the present study was to investigate the prevalences of RR-fibres and COX-negative fibres in female cleaners with (n=25) and without (n=23) trapezius myalgia and in clinically healthy female teachers (n=21). The cleaners did mainly floor cleaning requiring monotonous loading on the trapezius muscle. A questionnaire covering background data and aspects of pain (prevalence, duration, intensity and influence on daily living) was answered. Biopsies were obtained from the trapezius muscle by an open surgical technique. The three groups did not differ in prevalence of COX-negative or COX-superpositive (i.e. type-I fibres with extremely strong brownish reaction in both the COX and SDH/COX stainings) fibres. The prevalence of COX-negative fibres was age dependent. Two subgroups of RR-fibres were present when stained for COX; COX-negative (73%) and COX-superpositive (26%) fibres. Forty-two percent of the COX-negative fibres were RR-fibres and 79% of the COX-superpositive were RR-fibres. A significantly (P=0.002) higher proportion of the COX-superpositive fibres in the cleaners were RR-fibres compared to the teachers. Multivariate regression analysis revealed that age, occupation as cleaner and a tender point in the trapezius were significantly associated with increased prevalences of RR-fibres; a cleaner with a tender point had a 4.35 higher prevalence of RR-fibres compared to a teacher without a tender point. No correlations between other pain related variables and prevalence of RR-fibres were noted. In conclusion, RR-fibres but not COX-negative or COX-superpositive fibres were correlated with cleaning work tasks and with a tender point in the trapezius.
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| 9. |
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| 10. |
- Lindvall, Björn, 1952-, et al.
(författare)
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The expression of adhesion molecules in muscle biopsies : the LFA-1/VLA-4 ratio in polymyositis
- 2003
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Ingår i: Acta Neurologica Scandinavica. - : Hindawi Limited. - 0001-6314 .- 1600-0404. ; 107:2, s. 134-141
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Tidskriftsartikel (refereegranskat)abstract
- Objectives– The expression of three pairs of adhesion receptors and ligands was examined in 22 consecutive muscle biopsies showing morphological signs of inflammation.Material and methods– The following groups were studied: patients with polymyositis (PM) (n=7), patients with myositis that did not fulfil criteria for PM, i.e. suspected PM (n=5), patients with other diseases, with no clinical signs of inflammatory myopathy (n=6), and a small group of non-PM inflammatory myopathies (n=4). The endothelial expression of ICAM-1, VCAM-1 and E-selectin was evaluated, as was the cellular expression of LFA-1, VLA-4 and SLex. In addition, the expression of MHC class I and II was studied.Results– The ratio between the number of cells expressing LFA-1 and VLA-4 showed significant differences between the groups, with the lowest values in PM.Conclusion– The LFA-1/VLA-4 ratio should be suitable for diagnostic purposes. Our findings also indicate that the VLA-4/VCAM-1 system is important for chronic T cell inflammation in muscle, in line with findings in other “hidden” organs like joints and the central nervous system.
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