Loading...

Role of Intra-Abdominal Pressure and Abdominal Muscle Activities on Spinal Stability and Spinal Loads

Farahmand, Masoud | 2013

615 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44265 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): ParnianPour, Mohamad; Firoozbakhsh, Keikhosrow
  7. Abstract:
  8. Spine is one of the most important musculoskeletal systems of the human body. Any problem which is related to this part of human body causes pain and disability. Spinal compression forces are one of the main reasons of this disability and pain. It is assumed that intra-abdominal pressure causes spinal unloading in lifting. Studies usually don’t consider the role of intra-abdominal pressure and introduce it as an effective parameter which can increases spinal stability and influences spinal mechanics.Generation mechanism of intra-abdominal pressure remain enigmatic, studies that advocate the unloading effect of IAP usually consider a raise in IAP to be primarily due to the activity of transverse abdominis (TrA) whose fibers are mostly oriented in transverse plane thus imposing little or no compression penalty on the lumbar spine. On the other hand, others insist that appreciable increase in IAP cannot develop without simultaneous coactivity of all the abdominal muscles including internal oblique (IO), external oblique(EO), and rectus abdominis (RA) whose activity would counterbalance the upward unloading force and generated extensor moment due to IAP. The main objective of this project is to study the magnitude and pattern of muscle coactivities that occur with an increase in IAP. To achieve this goal, the finite element program ANSYS was used to develop a model of abdominal cavity then the relation between IAP and abdominal muscle coactivities has been achieved by this model, this relation will be used in muscle force evaluation. To evaluate muscle force, a kinematics-based approach along with a nonlinear finite element model of spine were iteratively used to calculate muscle forces and internal loads under prescribed measured posture and loads
  9. Keywords:
  10. Intra Abdominal Pressure (IAP) ; Lumbar Spine Portion ; Finite Element Method ; Muscle Activity ; Abdominal Muscles

 Digital Object List

 Bookmark

No TOC