Trunk muscles activation in different sitting postures during abdominal hollowing exercise Nanyang Polytechnic Physiotherapy

1. Trunk muscles activation in different sitting postures during abdominal hollowing exercise FYP 2010/2011 Li Kun Man Chui Jia Yi Jessie Meredith Lim Hui Yun Ong Choo Li Ruth

3. Low Back Pain(LBP) Neural Active Passive (Panjabi, 1992)

4. Stabilization Exercises Activation of stabilization muscles in non-functional positions (Mcmeeken 2004; Koppenhaver 2009; John& Beith ; Worth 2007; Brown and McGill, 2010) Current studies: Sitting

5. Muscle Activation in Sitting Usual, Slouched sitting postures (Dankaerts et al, 2006; Astfalck et al., 2010) Upright, Neutral-pelvic , Slouched sitting postures Muscle activity at rest - 5 second TrA activity during abdominal-hollowing exercise Previous Studies Our Study

6. Upright Neutral- pelvic Slouched

8. Hypothesis There will be greater activation of transverses abdominis (TrA) in neutral pelvic sitting during abdominal hollowing exercise

11. Outcome measures At rest Unsuccessful contraction Successful Contraction

14. Errors: 1-EO initiated / compensated 2-<10 seconds 3-IO initiated 4-IO lateral movement Subject 1 1 2 3 4 5 6 7 8 9 10 Score Crook-lying           10/10 Upright      3    3   8/10 Neutral      3      9/10 Slouched     2   1  4  3  4  4 4/10

18. Recruitment Subjects included n=9 Contraction of TrA in 3 different postures and crook-lying position Upright Neutral- pelvic Slouched SMVC taken 3 with no history of LBP 6 with history of acute LBP <3days

20. Sample of sEMG data Rectus Abdominis Internal Oblique/ Transverse Abdominis Erector Spinae

21. Trunk muscle activity in sitting posture 46.37 6.56 28.75 12.33 13.12 38.26 Neutral-pelvic Slouched Upright Internal Oblique/ Transverse Abdominis Erector Spinae Greatest activation P=0.112 P=0.047 P=0.007 P=0.006 Least activation

22. RPE and successful contraction score

23. Teaching position in crook lying 38.66 5.34 9.38 9.11

25. Trunk Muscle Activation Internal Oblique/ Transverse Abdominis Erector Spinae Neutral-pelvic Slouched Upright Optimal posture Favourable postures Unfavourable posture

26. Clinical Implications