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Force and Position Control in Humans - The Role of Augmented Feedback
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Published on: June 19, 2016

Effect of EMG-based feedback on posture correction during computer operation.

Se-yeon Park1, Won-gyu Yoo

  • 1Department of Physical Therapy, The Graduate School, Inje University, Republic of Korea.

Journal of Occupational Health
|June 8, 2012
PubMed
Summary

An EMG feedback device effectively reduced poor posture during computer use. Feedback targeting the lower back muscles was particularly effective in correcting forward head and flexed trunk postures.

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Area of Science:

  • Ergonomics
  • Biomechanics
  • Human-Computer Interaction

Background:

  • Prolonged computer use often leads to poor posture, including forward head and flexed trunk positions.
  • These postural issues can negatively impact the musculoskeletal system.
  • Electromyography (EMG) based feedback offers a potential solution for real-time posture correction.

Purpose of the Study:

  • To evaluate the effectiveness of an EMG-based feedback device in altering lumbar and cervical kinematics during computer operation.
  • To compare the effects of feedback from different muscle groups (upper trapezius, L4-erector spinae) versus no feedback.

Main Methods:

  • Four feedback conditions were tested: upper trapezius EMG, L4-erector spinae EMG, combined feedback, and no feedback (control).
  • Kinematic data of the lumbar and cervical regions were collected using the Zebris motion analysis system.
  • Fourteen university employees participated in 15-minute computer operation sessions under each condition.

Main Results:

  • EMG feedback significantly reduced kinematic changes in the sagittal plane compared to the control condition (p<0.05).
  • Feedback from the L4-erector spinae muscles notably decreased trunk flexion and forward head angles.
  • These reductions were statistically significant when compared to upper trapezius feedback and control conditions (p<0.05).

Conclusions:

  • EMG-based feedback is effective in mitigating habitual forward head and flexed-relaxed postures during computer work.
  • Targeting lumbar posture correction, specifically with L4-erector spinae feedback, can improve both lumbar and cervical alignment.
  • This technology shows promise for improving musculoskeletal health in computer users.