Pathophysiological mechanisms involved in genesis and spread of muscular tension in occupational muscle pain and in chronic musculoskeletal pain syndromes: A hypothesis

Johansson, Håkan; Sojka, Peter

doi:10.1016/0306-9877(91)90233-o

Cited by 371 publications

(245 citation statements)

References 33 publications

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“…In this FRR study, the increased muscle activation in the complete flexion phase might have been caused by a neuroreflex that occurs to protect the spine from damage 19) . A complex reflex regulating mechanism is involved in the control of spine segment motion.…”

Section: Discussionmentioning

confidence: 81%

“…Increased muscle pain can result from disturbed motor control, proprioceptive sensation, regulation of stiffness by altered sensitivity to stretching, and discharge of fusimotor neurons. Increased afferent receptor activity causes stiff muscles and increased electronic muscle activity to maintain spinal stability 19,20) . Therefore, muscle activation may be increased during the complete flexion phase.…”

Section: Discussionmentioning

confidence: 99%

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The Effect of Backpack Loads on FRR (Flexion-relaxation Ratio) in the Cervical Spine

Lee

Yoo

et al. 2011

J Phys Ther Sci

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Abstract. [Purpose] This study examined the effects of various backpack loads on the cervical flexion relaxation ratio as a quantitative neurological measure.[Subjects] Fourteen subjects with no neck pain participated in the study.[Methods] Surface electromyograms of the C4 paraspinal muscles were measured bilaterally, while subjects performed cervical flexion extension, and normalized in three phases. Cervical FRR data of three different backpack loads were analyzed. The FRR was calculated as the muscle activation during the cervical extension phase divided by the muscle activation during the relaxation phase.[Result] The FRR in the unloaded condition was 2.44 on the right and 2.37 on the left; for the backpack weighing 10% BM, the FRR were 1.91 and 1.89, respectively, and for the 20% BM backpack, FRR were 1.56 and 1.53, respectively. [Conclusion] A heavier backpack increased the potential for neck pain. The FRR is a functional examination that can be used to quantitatively assess the potential for developing cervical pain and the results of intervention.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

The Effect of Backpack Loads on FRR (Flexion-relaxation Ratio) in the Cervical Spine

Lee

Yoo

et al. 2011

J Phys Ther Sci

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“…Pain triggers γ-motor neuron activity in the muscle spindle afferents and increases muscle stiffness. 24 Increased muscle stiffness affects the state of chronic ischemia in the muscular capillaries and induces inflammatory mediators, such as pain-enhancing substances, to reduce the threshold of nociceptors. Moreover, lasting pain promotes muscle sympathetic nerve activity and peripheral vascular constriction to local hypoperfusion.…”

Section: Fig 2 Long-term Effect (5 Participants)mentioning

confidence: 99%

“…The anoxic conditions from hypoperfusion set up the dysfunction of muscular relaxation by inhibiting the production of adenosine triphosphate. 24 Furthermore, pain induces reflex inhibition and early muscle atrophy. 25,26 Weakness in the quadriceps muscles accelerates the progression of OA in the knee.…”

Section: Fig 2 Long-term Effect (5 Participants)mentioning

confidence: 99%

Clinical Validation of Pain Management Manipulative Therapy for Knee Osteoarthritis With the Squeeze-Hold Technique: A Case Series

Nakajima

2017

Journal of Chiropractic Medicine

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Objective: The purpose of this case series was to describe the short-term and long-term clinical effects of a manual technique for treating osteoarthritis (OA) knee pain. Methods: This study measured of the immediate effect and long-term effect by using a case series of different groups of subjects. Knee OA and activity restriction in patients were evaluated by using the Kellgren-Lawrence (K/L) Grading Scale and the Japanese Knee Osteoarthritis Measure (JKOM) index. In the intervention, lower limb muscles were squeezed by hand for 20 seconds. Each squeeze was performed for both lower limbs. Passive range-of-motion (ROM) exercise was performed on the knee joint. In one set of cases, immediate effects were measured after a one-time treatment with pretreatment and posttreatment outcome measures. Eleven people with knee OA participated in the study. On a visual analogue scale (VAS) for pain, muscle stiffness, and muscular hemodynamics for estimation of muscle blood flow were recorded before and after the squeeze-hold treatment. In another set of cases, the treatment was given to all patients once a week for 6 months, and long-term effects were measured. Data on 5 subjects with knee OA were collected for 6 months after initial treatment. The VAS for pain and JKOM were recorded every month for 6 months. Results: For immediate effects, the VAS was 69 ± 21 mm before treatment and 26 ± 22 mm after treatment. Muscle stiffness was 8.8 ± 3.6 (absolute number) before treatment and 3.5 ± 2.1 after treatment. Tissue (muscle) oxygen saturation was 60.1 ± 5.7% before treatment and 65.3 ± 4.8% after treatment. Total hemoglobin was 24.3 ± 3.3 (absolute number) before treatment and 25 ± 2.3 after treatment. A tendency for reduction in OA knee pain and muscle stiffness was observed, and a tendency for increase was observed in the blood flow in the muscle. For long-term effects in all 5 participants (any K/L grade, any JKOM score), OA knee pain and JKOM score improved gradually through 6 months. Conclusions: The participants in this case series showed improvement in pain and function. These findings indicate the feasibility of a larger study on the squeeze-hold intervention for OA knee pain. (J Chiropr Med 2017;16:122-130)

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“…There is a lack of knowledge regardin m a consensus in the scientific literature that the etiology is likely to be multi-fac Several hypotheses have been proposed for the etiology of neck and upper extremity symptoms/disorders in relation to light manual work such as office tasks (Hägg, 1991;Johansson and Sojka, 1991;Knardahl, 2002). However, no consensus has emerged to this date regarding the mechanisms involved.…”

mentioning

confidence: 99%

Concordance between VDU-users’ ratings of comfort and perceived exertion with experts’ observations of workplace layout and working postures

Lindegård

Karlberg

Tornqvist³

et al. 2005

Applied Ergonomics

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All previously published papers have been reproduced with permission from the publisher.Published and printed by Intellecta DocuSys AB, Göteborg, Sweden, 2007 © Agneta Lindegård Andersson, 2007 ISBN 978-91-628-7098-0 Working technique during computer work Associations with biomechanical and psychological strain, neck and upper extremity musculoskeletal symptoms Agneta Lindegård AnderssonThe Sahlgrenska Academy at Göteborg University, Institute of Medicine Department of Public Health and Community Medicine Occupational and Environmental Medicine AbstractAbout 35 % of the working population in Sweden report that computer use accounts for 50% or more of their total working hours. Among this population approximately 40% of the women and 25% of the men experienced symptoms in the neck and/or upper extremities at least once a week during the preceding 3 month. The overall aim of the studies underlying this thesis was to explore possible associations between working technique and perceived exertion, comfort, biomechanical and psychosocial strain as well as neck and upper extremity symptoms among computer users. Specific research questions addressed were a) Whether working technique was associated with muscle activity, wrist positions and forces applied to the computer mouse, respectively? b) Whether working technique was associated with psychological demands, emotional stress and perceived muscle tension, respectively? c) Whether there were associations between self-rated perceived comfort and observations of workplace layout and between self-rated perceived exertion and working postures. d) Whether working technique perceived exertion and comfort was associated with neck and upper extremity symptoms.The results showed that subjects classified as having a good working technique worked with less muscular load in the forearm (p=0.03) and in the trapezius muscle on the mouse operating side (p=0.02) compared to subjects classified as having a poor working technique. Subjects who reported high psychological demands and perceived muscular tension, respectively, used poorer working technique than subjects who did not perceive this conditions (demands, p=0.03, muscular tension, p=0.02). Moreover, the concordance between ratings of comfort and observations of workplace layout was reasonably good concerning the working chair and the keyboard and good regarding the computer screen and the input device. The concordance between ratings of perceived exertion and observations of working postures indicated good agreement for all measured body locations. This applies to the group that rated poor comfort and high exertion. Regarding the group that rated good comfort and low exertion ratings must be supplemented with observations. Furthermore, the results revealed that high perceived exertion and low comfort were related to an increased incidence of neck, and upper extremity symptoms, while poor working technique was not associated with such a risk. It is concluded that working technique is associated with both biomechanical and p...

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Pathophysiological mechanisms involved in genesis and spread of muscular tension in occupational muscle pain and in chronic musculoskeletal pain syndromes: A hypothesis

Cited by 371 publications

References 33 publications

The Effect of Backpack Loads on FRR (Flexion-relaxation Ratio) in the Cervical Spine

The Effect of Backpack Loads on FRR (Flexion-relaxation Ratio) in the Cervical Spine

Clinical Validation of Pain Management Manipulative Therapy for Knee Osteoarthritis With the Squeeze-Hold Technique: A Case Series

Concordance between VDU-users’ ratings of comfort and perceived exertion with experts’ observations of workplace layout and working postures

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