Forskning
Udskriv Udskriv
Switch language
Region Hovedstaden - en del af Københavns Universitetshospital
Udgivet

The influence of experimentally induced pain on shoulder muscle activity

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

DOI

  1. Sensory defunctionalization induced by 8% topical capsaicin treatment in a model of ultraviolet-B-induced cutaneous hyperalgesia

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  2. Influence of visual feedback, hand dominance and sex on individuated finger movements

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  3. Improved assessment of outcomes following transient global cerebral ischemia in mice

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  4. Effects of dopaminergic treatment on functional cortico-cortical connectivity in Parkinson's disease

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  5. Cue integration and the perception of action in intentional binding

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  1. Collagens in primary frozen shoulder: expression of collagen mRNA isoforms in the different phases of the disease

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  2. Functional muscle synergies to support the knee against moment specific loads while weight bearing

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  3. No detectable remodelling in adult human menisci: an analysis based on the C14 bomb pulse

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Vis graf over relationer

Muscle function is altered in painful shoulder conditions. However, the influence of shoulder pain on muscle coordination of the shoulder has not been fully clarified. The aim of the present study was to examine the effect of experimentally induced shoulder pain on shoulder muscle function. Eleven healthy men (range 22-27 years), with no history of shoulder or cervical problems, were included in the study. Pain was induced by 5% hypertonic saline injections into the supraspinatus muscle or subacromially. Seated in a shoulder machine, subjects performed standardized concentric abduction (0 degrees -105 degrees) at a speed of approximately 120 degrees/s, controlled by a metronome. During abduction, electromyographic (EMG) activity was recorded by intramuscular wire electrodes inserted in two deeply located shoulder muscles and by surface-electrodes over six superficially located shoulder muscles. EMG was recorded before pain, during pain and after pain had subsided and pain intensity was continuously scored on a visual analog scale (VAS). During abduction, experimentally induced pain in the supraspinatus muscle caused a significant decrease in activity of the anterior deltoid, upper trapezius and the infraspinatus and an increase in activity of lower trapezius and latissimus dorsi muscles. Following subacromial injection a significantly increased muscle activity was seen in the lower trapezius, the serratus anterior and the latissimus dorsi muscles. In conclusion, this study shows that acute pain both subacromially and in the supraspinatus muscle modulates coordination of the shoulder muscles during voluntary movements. During painful conditions, an increased activity was detected in the antagonist (latissimus), which support the idea that localized pain affects muscle activation in a way that protects the painful structure. Further, the changes in muscle activity following subacromial pain induction tend to expand the subacromial space and thereby decrease the load on the painful structures.

OriginalsprogEngelsk
TidsskriftExperimental Brain Research
Vol/bind194
Udgave nummer3
Sider (fra-til)329-37
Antal sider9
ISSN0014-4819
DOI
StatusUdgivet - apr. 2009

ID: 45104298