Trunk kinematics and trunk muscle activity during a rapidly applied load

  • Thomas J
  • Lavender S
  • Corcos D
 et al. 
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Abstract

This study investigated the trunk kinematics and electromyographic (EMG) activity of eight trunk muscles when 'expected' and 'unexpected' loads were applied directly to the torso. Twenty individuals (mean age: 25.1yr; range 20-33yr) participated in this mixed model study in which gender was the between-subjects factor, and expectancy and symmetry of the applied load were within-subject factors. The sudden load was delivered to the subject via a cable attached to a thoracic harness and motion was restricted to the lumbar spine by strapping the pelvis to a rigid fixation apparatus. Surface EMG was recorded bilaterally from the longissimus thoracis (LGT), erector spinae (ERS), rectus abdominis (RAB) and the external obliques (EXO). Trunk kinematics were measured with a Lumbar Motion Monitor(TM). During expected loading conditions, the peak muscle activity was reduced for the RAB and EXO bilaterally, and for the ERS(R) (p

Author-supplied keywords

  • Biomechanics
  • Gender
  • Spine
  • Sudden loading
  • Trunk muscle activity

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Authors

  • James S. Thomas

  • Steven A. Lavender

  • Daniel M. Corcos

  • Gunar B J Andersson

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