Advertisement

Microcirculation in the upper trapezius muscle during sustained shoulder load in healthy women an endurance study using percutaneous laser-Doppler flowmetry and surface electromyography

  • Sven-Erik Larsson
  • Hongming Cai
  • Qiuxia Zhang
  • Romy Larsson
  • P. Åke Öberg
Original Article

Abstract

Microcirculation in the upper portion of the trapezius muscle was measured percutaneously in a group of 16 healthy women of different ages by continuous laser-Doppler flowmetry (LDF) in relation to electromyography (EMG) during an endurance test. During the measurements the subject kept her arms straight and elevated at 45° in the scapular plane and held a 1-kg load in each hand as long as possible. This was followed by rest with the arms hanging and carrying no load. The 10-min recording period comprised 1-min initial rest followed by the endurance test and then recovery. Signal processing was done by computer on line. The LDF and root-mean-square (rms) EMG signals were normalized. Spectrum analyses of EMG mean power frequency (MPF) were performed. The amount of load produced was on average 2,267 (SD 939) N · m · s, i.e. shoulder torque × time expressed as Newton meter seconds, and the endurance time was 4.3 (SD 1.20) min. The rms-EMG as well as the LDF increased significantly during endurance, both when related to endurance time and to amount of load. The MPF showed no significant changes. The mean total increase in muscle blood flow was 175% of that recorded in the initial rest period. The average increase per each 10 s of contraction was 2.9%. Maximum was reached during the 1st min of recovery followed by a fall to the base level that was reached within 77 s on average. The amount of load produced and the blood flow increase was smaller than that found in a separate study of men, indicating a lower functional capacity. This may be of importance for the development of neck-shoulder disability in women.

Key words

Trapezius muscle perfusion Laser-Doppler flowmetry Muscle fatigue Endurance Electromyography 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Arendt-Nielsen L, Mills KR, Forster A (1989) Changes in muscle fiber conduction velocity, mean power frequency, and mean EMG voltage during prolonged submaximal contractions. Muscle Nerve 12:493–497Google Scholar
  2. Basmajian JV, DeLuca CV (1985) Muscles alive. Their functions revealed by electromyography. Williams and Wilkins, Baltimore, Md.Google Scholar
  3. Blomqvist CG, Lewis S, Taylor F, Graham RM (1981) Similarity of the hemodynamic responses to static and dynamic exercise of small muscle groups. Circ Res 48 [Suppl 1]:87–92Google Scholar
  4. Chaffin DB, Andersson G (1984) Occupational biomechanics. Wiley, New York, pp 14–52Google Scholar
  5. DeLuca CJ (1984) Myoelectric manifestations of localized muscular fatigue in humans. CRC Crit Rev Biomed Eng 11:251–279Google Scholar
  6. Gerdle B, Edström M, Rahm M (1993) Fatigue in the shoulder muscles during static work at two different torque levels. Clin Physiol 13:469–482Google Scholar
  7. Hagberg M (1981) Electromyographic signs of muscle fatigue in two elevated arm positions. Am J Phys Med 60:111–121Google Scholar
  8. Hagberg M, Wegman DH (1987) Prevalence rates and odds rations of shoulder-neck diseases in different occupational groups. Br J Ind Med 44:602–610Google Scholar
  9. Järvholm U, Palmerud G, Karlsson D, Herberts P, Kadefors R (1991) Intramuscular pressure and electromyography in four shoulder muscles. J Orthop Res 9:609–619Google Scholar
  10. Kogi K, Hakamada T (1962) Frequency analysis of the surface electromyogram in muscle fatigue. J Sci Labour (Tokyo) 38:519–528Google Scholar
  11. Kvarnström S (1983) Occurrence of musculoskeletal disorders in a manufactoring industry, with special reference to occupational shoulder disorders. Scand J Rehabil Med [Suppl 8]:1–114Google Scholar
  12. Larsson S-E, Öberg PÅ (1990) Percutaneous recording of muscle blood flow using laser-Doppler single fibre technique. Sixth International Conference in Biomedical Engineering. Goth and Nather, Singapore, pp 549–551Google Scholar
  13. Larsson S-E, Bengtsson A, Bodegård L, Henriksson KG, Larsson J (1988) Muscle changes in work-related chronic myalgia. Acta Orthop Scand 59:552–556Google Scholar
  14. Larsson S-E, Bodegård L, Henriksson KG, Öberg PÅ (1990) Chronic trapezius myalgia. Morphology and blood flow studied in 17 patients. Acta Orthop Scand 61:394–398Google Scholar
  15. Larsson S-E, Cai H, Öberg PÅ (1993a) Continuous percutaneous measurement by laser-Doppler flowmetry of skeletal muscle microcirculation at varying levels of contraction force determined electromyographically. Eur J Appl Physiol 66:477–482Google Scholar
  16. Larsson S-E, Cai H, Öberg PÅ (1993b) Micro circulation in the upper trapezius muscle during varying levels of static contraction, fatigue and recovery in healthy women — a study using percutaneous laser-Doppler flowmetry and surface electromyography. Eur J Appl Physiol 66:483–488Google Scholar
  17. Larsson S-E, Cai H, Qiuxia Z; Larsson R, Öberg Å (1995) Microcirculation and electromyography in the upper trapezius muscle during sustained shoulder load. An endurance study of 13 healthy men using laser-Doppler flowmetry. Eur J Exp Musculoskel Res (in press)Google Scholar
  18. LeVeau B (1977) Biomechanics of human motion. Saunders, Philadelphia, Penn.Google Scholar
  19. Lineman R, Hagberg M, Ängquist K-A, Söderlund K, Hultman E, Thornell L-E (1991) changes in muscle morphology in chronic trapezius myalgia. Scand J Work Environ Health 17:347–355Google Scholar
  20. Lindman R, Hagberg M, Henriksson K-G, Bengtsson A and Thornell L-E (1995) Capillary structure and mitochondria) volume density in the normal trapezius muscle and in chronic trapezius myalgia and in fibromyalgia. J Musculoskel Pain (in press)Google Scholar
  21. Lindström L, Magnusson R, Petersén I (1970) Muscular fatigue and action potential conduction velocity changes studied with frequency analysis of EMG signals. Electromyography 4:341–356Google Scholar
  22. Neter J, Wasserman J, Utner MH (1989) Applied linear regression models (2nd edn). Irwin, Homewood, III.Google Scholar
  23. Öberg T (1994) Subjective and objective evaluation of shoulder muscle fatigue. Ergonomics 37:1323–1333Google Scholar
  24. Öberg T, Sandsjö L, Kadefors R (1991) Variability of the EMG mean power frequency. J Electromyogr Kinesiol 1:237–243Google Scholar
  25. Salerud EG, Öberg PÅ (1987) Single fiber laser-Doppler flowmetry. A method of deep tissue perfusion measurements. Med Biol Eng Comput 25:329–334Google Scholar
  26. Schuldt K, Ekholm J, Harms-Ringdahl K, Arborelius UP, Nemeth G (1987) Influence of sitting postures on neck and shoulder e.m.g. during arm-hand work movements. Clin Biomech 2:126–139Google Scholar
  27. Sjögaard G (1991) Role of exercise-induced potassium fluxes underlying muscle fatigue; a brief review. Can J Physiol Pharmacol 69:238–245Google Scholar
  28. Sjögaard G, Kiens B, Jörgensen K, Saltin B (1986) Intramuscular pressure, EMG and blood flow during low-level prolonged static contraction in man. Acta Physiol Scand 128:475–484Google Scholar
  29. Sjögaard G, Savard G, Juel C (1988) Muscle blood flow during isometric activity and its relation to muscle fatigue. Eur J Appl Physiol 57:327–335Google Scholar

Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • Sven-Erik Larsson
    • 1
  • Hongming Cai
    • 2
  • Qiuxia Zhang
    • 1
  • Romy Larsson
    • 1
  • P. Åke Öberg
    • 2
  1. 1.Department of OrthopaedicsUniversity HospitalLinköpingSweden
  2. 2.Department of Biomedical EngineeringUniversity HospitalLinköpingSweden

Personalised recommendations