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Related Experiment Videos

Surface EMG recordings during maximum static shoulder forward flexion in different positions.

B Gerdle1, N E Eriksson, L Brundin

  • 1National Institute of Occupational Health, Work Physiology Division, Umeå, Sweden.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1988
PubMed
Summary

Shoulder flexion position affects muscle activity. Higher mean power frequency in deltoid and infraspinatus muscles was observed at 90 degrees of shoulder flexion compared to 45 degrees.

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Exercise Physiology

Background:

  • Understanding muscle activation patterns during shoulder movements is crucial for injury prevention and rehabilitation.
  • Static contractions provide a baseline for analyzing neuromuscular control.

Purpose of the Study:

  • To investigate the influence of shoulder flexion range of motion on the power spectral density function of shoulder muscles.
  • To analyze how different joint angles affect muscle activation during static shoulder forward flexion.

Main Methods:

  • 23 healthy females performed maximal static shoulder forward flexions at 45, 65, and 90 degrees.
  • Electromyographic (EMG) signals were recorded from the trapezius, deltoid, infraspinatus, and biceps brachii muscles.
  • Torque and shoulder angle data were analyzed using computer algorithms, calculating mean power frequency and root mean square values.

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Main Results:

  • Mean power frequency did not significantly change in the trapezius and biceps brachii across the tested positions.
  • The deltoid and infraspinatus muscles exhibited significantly higher mean power frequencies at 90 degrees of flexion compared to 45 degrees.
  • These findings suggest position-dependent changes in neuromuscular activity within specific shoulder muscles.

Conclusions:

  • The range of motion significantly impacts the power spectral density function of the deltoid and infraspinatus during static shoulder flexion.
  • Standardization of the range of motion is essential when comparing muscle activity, particularly in studies involving dynamic fatiguing contractions.
  • Further research is needed to explore the underlying physiological factors contributing to these observed changes.