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- Elcadi, Guilherme H., 1966-, et al.
(author)
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Shoulder and forearm oxygenation and myoelectric activity in patients with work related muscle pain and healthy subjects
- 2013
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In: European Journal of Applied Physiology. - New York : Springer. - 1439-6319 .- 1439-6327. ; 113:5, s. 1103-1115
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Journal article (peer-reviewed)abstract
- We tested hypotheses of (i) reduced oxygen usage, oxygen recovery, blood flow and oxygen consumption; and (ii) increased muscle activity for patients diagnosed with work related muscle pain in comparison to healthy controls. Oxygenation was measured with near infrared spectroscopy (NIRS), and muscle activity with EMG for the extensor carpi radialis (ECR) and trapezius descendens (TD) muscles. Eighteen patients with diffuse neck-shoulder-arm pain and seventeen controls (matched in age and sex) were equipped with NIRS and EMG probes. After determining an individual’s maximum voluntary contraction (MVC) force, short term (20 sec) isometric contractions for the ECR and TD of 10%, 30%, 50% and 70% MVC generated ∆StO2% and StO2% recovery (Rslope) from NIRS, and RMS%max from EMG signals. In addition, upper arm venous (VO) and arterial (AO) occlusions generated slopes of total hemoglobin (HbTslope) and deoxyhemoglobin (HHbslope) for the resting ECR as surrogates of blood flow and oxygen consumption, respectively. Mixed Model analyses, t-tests, and Mann-Whitney test were used to assess differences between groups. There was no significant difference in MVC between groups for either muscle. Also, ∆StO2%, Rslope for either muscle, and ECR-HbTslope were not different between groups, thus our hypotheses of reduced oxygen use, recovery, and blood flow for patients were not confirmed. However, patients had a significantly lower ECR-HHbslope confirming our hypothesis of reduced consumption. Further, there was no difference in RMS%max during contractions meaning that the hypothesis of increased activity for patients was not confirmed. When taking into account the number of NIRS variables studied, differences we found between our patient group and healthy controls (i.e. in forearm oxygen consumption and shoulder oxygen saturation level) may be considered modest. Overall our findings may have been impacted by the fact that our patients and controls were similar in muscle strength, which is in contrast to previous studies.
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| 4. |
- Flodgren, Gerd, 1961-, et al.
(author)
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Changes in interstitial noradrenaline, trapezius muscle activity and oxygen saturation during low-load work and recovery
- 2009
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In: European Journal of Applied Physiology. - : Springer Science and Business Media LLC. - 1439-6319 .- 1439-6327. ; 107:1, s. 31-42
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Journal article (peer-reviewed)abstract
- Both physical as well as mental demands result in an increased activity in the sympathetic nervous system (SNS) with changes in blood-pressure and heart-rate. Through local release of catecholamines, e.g. noradrenaline (NAd) SNS exerts various actions at the muscle level. The aims of this study were to investigate the effects of low-load repetitive work alone and in combination with mental demands on local muscle interstitial noradrenaline concentration [NAd]i, muscle activity and oxygenation, assessed with microdialysis, surface electromyography, and near-infrared spectroscopy, respectively. Healthy females (n = 15) were exposed to (1) 30 min repetitive work (RW) and (2) 30 min repetitive work with superimposed mental load (RWML) on two different occasions. Muscle [NAd]i and muscle activity increased significantly in response to RW, but did not increase further during RWML. For RW, [NAd]i was found to be inversely correlated to muscle activity. Oxygenation decreased significantly during work, independently of occasion. Our findings indicate that low-load work causes significantly increased trapezius muscle [NAd]i in healthy females, and short periods of superimposed mental load do not add to this increase and further, that both muscle activity and oxygenation were unaffected by the superimposed mental load.
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| 5. |
- Flodgren, Gerd, et al.
(author)
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Combining microdialysis and near infrared spectroscopy for studying effects of low-load repetitive work on the intramuscular chemistry in trapezius myalgia
- 2010
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In: Journal of Biomedicine and Biotechnology. - : Hindawi Limited. - 1110-7243 .- 1110-7251. ; 2010
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Journal article (peer-reviewed)abstract
- Epidemiological research provides strong evidence for a link between repetitive work (RW) and the development of chronic trapezius myalgia (TM). The aims were to further elucidate if an accumulation of sensitising substances or impaired oxygenation is evident in painful muscles during RW. Females with TM (n=14) were studied during rest, 30 min RW and 60 min recovery. Microdialysate samples were obtained to determine changes in [glutamate], [PGE2], [lactate], and [pyruvate] relative to work. Muscle oxygenation (%StO2) was assessed using near-infrared spectroscopy. During work all investigated substances, except PGE2, increased significantly: [glutamate] (54%, P<0.0001), [lactate] (26%, P<0.005), [pyruvate] (19%, P<0.0001), while the %StO2 decreased (P<0.05). During recovery [PGE2] decreased (P<0.005), [lactate] remained increased (P<0.001), [pyruvate] increased progressively (P<0.0001), and %StO2 had returned to baseline. Changes in substance concentrations and oxygenation in response to work indicate normal increase in metabolism but no ongoing inflammation in subjects withTM.
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| 7. |
- Wiitavaara, Birgitta, et al.
(author)
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Prevalence, diagnostics, and management of musculoskeletal disorders in primary health care in Sweden : an investigation of 2000 randomly selected patient records
- 2017
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In: Journal of Evaluation In Clinical Practice. - : Wiley. - 1356-1294 .- 1365-2753. ; 23:2, s. 325-332
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Journal article (peer-reviewed)abstract
- Background. To improve the care of patients suffering from musculoskeletal disorders (MSD) further knowledge regarding the prevalence, diagnostics and management of different MSD in primary care is required. Thus the aims of this study were: -to investigate the prevalence of patients seeking care due to different MSD at primary health care centres (PHCs); -to chart different factors as symptoms, diagnosis, and actions prescribed for patients that visited the PHCs due to MSD; and -to make comparisons regarding differences due to gender, age, and rural or urban PHC.Methods. 2000 patient records for patients in working age were randomly selected equally distributed on one rural and one urban PHC. A 3-year period was reviewed retrospectively. For all patient records age, sex, occupation, occupational activity, date of visit, if it was a new or re-visit, cause to the visit, and diagnosis related to the visit were registered. For visits due to MSD the location of the patients symptoms, which symptoms were described in the patient record, the type of those symptoms, which actions were prescribed to resolve the patients problems, and also sickleave prior to and after the visit, were registered. Data was analysed using cross tabulation, multidimensional Chi-square (Pearson), and a probability level of p < .05.Results. The prevalence of MSD was high, almost 60 % of the patients had some sort of MSD symptoms, either at the day for visit or the reviewed 3 year period, and a bit higher among women than men. Upper and lower limb problems were most common. Symptoms were most prevalent in the young and middle age-groups. The patients got a variety of different diagnoses, and between 13-35 % of the patients did not receive a MSD-diagnose despite having MSD-symptoms. There was a great variation in how the cases were handled. Medication and sick leave certificates were most common while work-related rehabilitation was less common. Conclusion. The present study points out some weaknesses regarding diagnostics and management of MSD in primary care. Further studies to compare the results regarding diagnoses for musculoskeletal symptoms and measures taken to solve the patients’ problems would be of interest.
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