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Related Experiment Videos

Back and abdominal muscle function during stabilization exercises.

J P Arokoski1, T Valta, O Airaksinen

  • 1Departments of Physical and Rehabilitation Medicine, Kuopio University Hospital, Kuopio, Finland. Jari.Arokoski@kuh.fi

Archives of Physical Medicine and Rehabilitation
|August 9, 2001
PubMed
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Therapeutic exercises effectively activate core muscles, with women showing greater activation of trunk stabilizers than men. Modifying exercises by changing limb and trunk positions can increase muscle activity for low back pain management.

Area of Science:

  • Rehabilitation Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Low back pain is a prevalent condition often treated with therapeutic exercises targeting paraspinal and abdominal muscles.
  • Understanding muscle activation patterns during these exercises is crucial for optimizing treatment efficacy.

Purpose of the Study:

  • To evaluate paraspinal and abdominal muscle activity during various therapeutic exercises.
  • To investigate the impact of load increments and altered body positions on muscle activation.

Main Methods:

  • A cross-sectional study involving 24 healthy adults (14 women, 10 men).
  • Surface electromyography (EMG) recorded from paraspinal (T9, L5) and abdominal (rectus abdominis, obliquus externus) muscles during 16 therapeutic exercises.
  • EMG data normalized to maximal voluntary contraction (% MVC) for standardized comparison.

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Main Results:

  • Therapeutic exercises generally elicited <50% MVC in assessed muscles.
  • Women demonstrated significantly higher multifidus (L5), rectus abdominis, and obliquus externus muscle activity compared to men.
  • Increased load or unbalanced movements significantly enhanced paraspinal and abdominal muscle activation.

Conclusions:

  • Standard therapeutic exercises effectively engage core stabilizing muscles.
  • Exercise modifications, including limb/trunk positioning and movement unbalancing, can modulate trunk muscle activation intensity.
  • Women exhibit a greater capacity for activating trunk stabilizing muscles, though men's potentially higher maximal strength may influence their relative activation levels.