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European Journal of Applied Physiology

, Volume 110, Issue 2, pp 415–423 | Cite as

Active biofeedback changes the spatial distribution of upper trapezius muscle activity during computer work

  • Afshin Samani
  • Andreas Holtermann
  • Karen Søgaard
  • Pascal MadeleineEmail author
Original Article

Abstract

The aim of this study was to investigate the spatio-temporal effects of advanced biofeedback by inducing active and passive pauses on the trapezius activity pattern using high-density surface electromyography (HD-EMG). Thirteen healthy male subjects performed computer work with superimposed feedback either eliciting passive (rest) or active (approximately 30% MVC) pauses based on fuzzy logic design and a control session with no feedback. HD-EMG signals of upper trapezius were recorded using a 5 × 13 multichannel electrode grid. From the HD-EMG recordings, two-dimensional maps of root mean square (RMS), relative rest time (RRT) and permuted sample entropy (PeSaEn) were obtained. The centre of gravity (CoG) and entropy of maps were used to quantify changes in the spatial distribution of muscle activity. PeSaEn as a measure of temporal heterogeneity for each channel, decreased over the whole map in response to active pause (P < 0.05) underlining a more homogenous activation pattern. Concomitantly, the CoG of RRT maps moved in caudal direction and the entropy of RMS maps as a measure of spatial heterogeneity over the whole recording grid, increased in response to active pause session compared with control session (no feedback) (P < 0.05). Active pause compared with control resulted in more heterogeneous coordination of trapezius compared with no feedback implying a more uneven spatial distribution of the biomechanical load. The study introduced new aspects in relation to the potential benefit of superimposed muscle contraction in relation to the spatial organization of muscle activity during computer work.

Keywords

Biofeedback Muscle spatial organisation Muscle subdivisions Permuted sample entropy Neck–shoulder disorders 

Notes

Acknowledgements

This work was financially supported by Det Obelske Familiefond, Gigtforeningen and the Danish Agency for Science, Technology and Innovation.

References

  1. Alexander C, Miley R, Stynes S, Harrison PJ (2007) Differential control of the scapulothoracic muscles in humans. J Physiol (Lond) 580:777CrossRefGoogle Scholar
  2. Bawa P, Murnaghan C (2009) Motor unit rotation in a variety of human muscles. J Neurophysiol 102:2265–2272CrossRefPubMedGoogle Scholar
  3. Birch L, Arendt-Nielsen L, Graven-Nielsen T, Christensen H (2001) An investigation of how acute muscle pain modulates performance during computer work with digitizer and puck. Appl Ergon 32:281–286CrossRefPubMedGoogle Scholar
  4. Blangsted AK, Søgaard K, Christensen H, Sjøgaard G (2004) The effect of physical and psychosocial loads on the trapezius muscle activity during computer keying tasks and rest periods. Eur J Appl Physiol 91:253–258CrossRefPubMedGoogle Scholar
  5. Costa M, Goldberger AL, Peng CK (2002) Multiscale entropy analysis of complex physiologic time series. Phys Rev Lett 89:68102CrossRefGoogle Scholar
  6. Crenshaw A, Djupsjöbacka M, Svedmark Å (2006) Oxygenation, EMG and position sense during computer mouse work. Impact of active versus passive pauses. Eur J Appl Physiol 97:59–67CrossRefPubMedGoogle Scholar
  7. Falla D, Farina D (2007) Periodic increases in force during sustained contraction reduce fatigue and facilitate spatial redistribution of trapezius muscle activity. Exp Brain Res 182:99–107CrossRefPubMedGoogle Scholar
  8. Farina D, Madeleine P, Graven-Nielsen T, Merletti R, Arendt-Nielsen L (2002) Standardising surface electromyogram recordings for assessment of activity and fatigue in the human upper trapezius muscle. Eur J Appl Physiol 86:469–478CrossRefPubMedGoogle Scholar
  9. Farina D, Leclerc F, Arendt-Nielsen L, Buttelli O, Madeleine P (2008) The change in spatial distribution of upper trapezius muscle activity is correlated to contraction duration. J Electromyogr Kinesiol 18:16–25CrossRefPubMedGoogle Scholar
  10. Gonzalez RC, Woods RE, Eddins SL (2004) Digital image processing using MATLAB. Prentice-Hall, Upper Saddle RiverGoogle Scholar
  11. Gorassini M, Yang JF, Siu M, Bennett DJ (2002) Intrinsic activation of human motoneurons: reduction of motor unit recruitment thresholds by repeated contractions. J Neurophysiol 87:1859PubMedGoogle Scholar
  12. Henneman E, Olson CB (1965) Relations between structure and function in the design of skeletal muscles. J Neurophysiol 28:581–598PubMedGoogle Scholar
  13. Hermens HJ, Hutten MMR (2002) Muscle activation in chronic pain: its treatment using a new approach of myofeedback. Int J Ind Ergon 30:325–336CrossRefGoogle Scholar
  14. Holtermann A, Roeleveld K, Karlsson JS (2005) Inhomogeneities in muscle activation reveal motor unit recruitment. J Electromyogr Kinesiol 15:131–137CrossRefPubMedGoogle Scholar
  15. Holtermann A, Søgaard K, Christensen H, Dahl B, Blangsted AK (2008) The influence of biofeedback training on trapezius activity and rest during occupational computer work: a randomized controlled trial. Eur J Appl Physiol 104:983–989CrossRefPubMedGoogle Scholar
  16. Jensen C, Finsen L, Hansen K, Christensen H (1999) Upper trapezius muscle activity patterns during repetitive manual material handling and work with a computer mouse. J Electromyogr Kinesiol 9:317–325CrossRefPubMedGoogle Scholar
  17. Kleine BU, Schumann NP, Stegeman DF, Scholle HC (2000) Surface EMG mapping of the human trapezius muscle: the topography of monopolar and bipolar surface EMG amplitude and spectrum parameters at varied forces and in fatigue. Clin Neurophysiol 111:686–693CrossRefPubMedGoogle Scholar
  18. Kroemer KHE, Kroemer HB, Kroemer-Elbert KE (2001) Ergonomics: how to design for ease and efficiency. Prentice-Hall, New JerseyGoogle Scholar
  19. Madeleine P, Farina D (2008) Time to task failure in shoulder elevation is associated to increase in amplitude and to spatial heterogeneity of upper trapezius mechanomyographic signals. Eur J Appl Physiol 102:325–333CrossRefPubMedGoogle Scholar
  20. Madeleine P, Cescon C, Farina D (2006a) Spatial and force dependency of mechanomyographic signal features. J Neurosci Methods 158:89–99CrossRefPubMedGoogle Scholar
  21. Madeleine P, Leclerc F, Arendt-Nielsen L, Ravier P, Farina D (2006b) Experimental muscle pain changes the spatial distribution of upper trapezius muscle activity during sustained contraction. Clin Neurophysiol 117:2436–2445CrossRefPubMedGoogle Scholar
  22. Madeleine P, Samani A, Binderup AT, Stensdotter AK (2009) Changes in the spatio-temporal organization of the trapezius muscle activity in response to eccentric contractions. Scan J Sports Sci Med. doi: 10.1111/j.1600-0838.2009.01037
  23. Richman JS, Moorman JR (2000) Physiological time-series analysis using approximate entropy and sample entropy. Am J Physiol Heart Circ Physiol 278:2039–2049Google Scholar
  24. Samani A, Holtermann A, Søgaard K, Madeleine P (2009a) Active pauses induces more variable electromyographic pattern of the trapezius muscle activity during computer work. J Electromyogr Kinesiol 19:e430–e437CrossRefPubMedGoogle Scholar
  25. Samani A, Holtermann A, Søgaard K, Madeleine P (2009b) Experimental pain leads to reorganisation of trapezius electromyography during computer work with active and passive pauses. Eur J Appl Physiol 106:857–866CrossRefPubMedGoogle Scholar
  26. Samani A, Holtermann A, Søgaard K, Madeleine P (2009c) Effects of eccentric exercise on trapezius electromyography during computer work with active and passive pauses. Clin Biomech 24:619–625CrossRefGoogle Scholar
  27. Sjøgaard G, Søgaard K (1998) Muscle injury in repetitive motion disorders. Clin Orthop 351:21PubMedGoogle Scholar
  28. Søgaard K (1995) Motor unit recruitment pattern during low-level static and dynamic contractions. Muscle Nerve 18:292–300CrossRefPubMedGoogle Scholar
  29. Søgaard K, Christensen H, Jensen BR, Finsen L, Sjøgaard G (1996) Motor control and kinetics during low level concentric and eccentric contractions in man. Electroencephalogr Clin Neurophysiol 101:453–460PubMedGoogle Scholar
  30. Vaillancourt DE, Newell KM (2002) Changing complexity in human behavior and physiology through aging and disease. Neurobiol Aging 23:1–11CrossRefPubMedGoogle Scholar
  31. Visser B, van Dieën JH (2006) Pathophysiology of upper extremity muscle disorders. J Electromyogr Kinesiol 16:1–16CrossRefPubMedGoogle Scholar
  32. Westad C, Westgaard RH, Luca CJD (2003) Motor unit recruitment and derecruitment induced by brief increase in contraction amplitude of the human trapezius muscle. J Physiol (Lond) 552:645–656CrossRefGoogle Scholar
  33. Westgaard RH, De Luca CJ (1999) Motor unit substitution in long-duration contractions of the human trapezius muscle. J Neurophysiol 82:501PubMedGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Afshin Samani
    • 1
    • 2
  • Andreas Holtermann
    • 2
  • Karen Søgaard
    • 3
  • Pascal Madeleine
    • 1
    Email author
  1. 1.Laboratory for Ergonomics and Work-related Disorders, Center for Sensory-Motor Interaction (SMI), Department of Health Science and TechnologyAalborg UniversityAalborg EastDenmark
  2. 2.National Research Centre for the Working EnvironmentCopenhagenDenmark
  3. 3.Institute of Sports Science and Clinical BiomechanicsUniversity of Southern DenmarkOdense MDenmark

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