European Journal of Applied Physiology

, Volume 108, Issue 4, pp 657–669

Muscle oxygenation and glycolysis in females with trapezius myalgia during stress and repetitive work using microdialysis and NIRS

  • Gisela Sjøgaard
  • Lars Rosendal
  • Jesper Kristiansen
  • Anne K. Blangsted
  • Jørgen Skotte
  • Britt Larsson
  • Björn Gerdle
  • Bengt Saltin
  • Karen Søgaard
Original Article

DOI: 10.1007/s00421-009-1268-2

Cite this article as:
Sjøgaard, G., Rosendal, L., Kristiansen, J. et al. Eur J Appl Physiol (2010) 108: 657. doi:10.1007/s00421-009-1268-2

Abstract

The aim of this investigation was to study female workers active in the labour market for differences between those with trapezius myalgia (MYA) and without (CON) during repetitive pegboard (PEG) and stress (STR) tasks regarding (1) relative muscle load, (2) trapezius muscle blood flow, (3) metabolite accumulation, (4) oxygenation, and (5) pain development. Among 812 female employees (age 30–60 years) at 7 companies with high prevalence of neck/shoulder complaints, clinical examination identified 43 MYA and 19 CON. At rest, during PEG, and STR the trapezius muscle was measured using (1) EMG and MMG, (2) microdialysis, and (3) NIRS. Further, subjective pain ratings were scored (VAS). EMGrms in %MVE (Maximal Voluntary EMG-activity), was significantly higher among MYA than CON during PEG (11.74 ± 9.09 vs. 7.42 ± 5.56%MVE) and STR (5.47 ± 5.00 vs. 3.28 ± 1.94%MVE). MANOVA showed a group and time effect regarding data from the microdialysis: for MYA versus CON group differences demonstrated lower muscle blood flow and higher lactate and pyruvate concentrations. Potassium and glucose only showed time effects. NIRS showed similar initial decreases in oxygenation with PEG in both groups, but only in CON a significant increase back to baseline during PEG. VAS score at rest was highest among MYA and increased during PEG, but not for CON. The results showed significant differences between CON and MYA regarding muscle metabolism at rest and with PEG and STR. Higher relative muscle load during PEG and STR, insufficient muscle blood flow and oxygenation may account for the higher lactate, pyruvate and pain responses among MYA versus CON.

Keywords

Electromyography Exercise Metabolism Oxygenation Pain 

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Gisela Sjøgaard
    • 5
  • Lars Rosendal
    • 2
  • Jesper Kristiansen
    • 1
  • Anne K. Blangsted
    • 1
  • Jørgen Skotte
    • 1
  • Britt Larsson
    • 3
    • 6
  • Björn Gerdle
    • 3
    • 6
  • Bengt Saltin
    • 4
  • Karen Søgaard
    • 5
  1. 1.National Research Centre for the Working EnvironmentCopenhagenDenmark
  2. 2.Trial ConsultGentofteDenmark
  3. 3.Rehabilitation Medicine, Department of Clinical and Experimental Medicine, Faculty of Health SciencesLinköping UniversityLinköpingSweden
  4. 4.CRMCUniversity of CopenhagenCopenhagenDenmark
  5. 5.Institute of Sport Sciences and Clinical BiomechanicsUniversity of Southern DenmarkOdense MDenmark
  6. 6.Pain and Rehabilitation CentreUniversity HospitalLinköpingSweden