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Muscle activities during asymmetric trunk angular accelerations.

W S Marras1, G A Mirka

  • 1Department of Industrial and Systems Engineering, Ohio State University, Columbus 43210.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|November 1, 1990
PubMed
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Trunk muscle activity significantly increases with trunk acceleration and asymmetry during lifting, even with low torque. Intra-abdominal pressure showed minimal changes, suggesting muscles play a key role in spine loading.

Area of Science:

  • Biomechanics
  • Occupational Health
  • Human Movement Science

Background:

  • Manual materials handling tasks pose risks for spine injury.
  • Understanding trunk muscle and intra-abdominal pressure responses is crucial for injury prevention.

Purpose of the Study:

  • To investigate trunk muscle electromyography and intra-abdominal pressure during varied trunk extension accelerations and twists.
  • To determine how these factors influence spine loading during lifting.

Main Methods:

  • Electromyographic activity of 10 trunk muscles and intra-abdominal pressure were measured in 39 subjects.
  • Subjects performed trunk movements under high, medium, and low constant angular acceleration conditions with varying trunk twist.

Main Results:

Related Experiment Videos

  • Nearly all trunk muscles were affected by changes in acceleration and asymmetry.
  • Muscle activation reached up to 50% of maximum with minimal torque production.
  • Muscles farther from the spine, like latissimus dorsi and obliques, showed the greatest activity increase with higher acceleration and asymmetry.
  • Intra-abdominal pressure exhibited minimal changes across tested conditions.

Conclusions:

  • Trunk muscle activation patterns are sensitive to angular acceleration and asymmetry during lifting.
  • Muscles distant from the spine are critical contributors to stability and spine loading under dynamic conditions.
  • The limited change in intra-abdominal pressure suggests that trunk muscle co-contraction is a primary mechanism for managing spine loads in these scenarios.