Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2012) 11, 510 - 515

Research article
Comparison of Trunk Muscle Activity During Bridging Exercises Using a Sling in Patients with Low Back Pain
HyungKyu Kang1, JinHwa Jung2, JaeHo Yu3, 
Author Information
1 Department of Physical Therapy, Sahmyook University, Seoul, Republic of Korea
2 Department of Occupational Therapy, Semyung University, Jecheon-si, Republic of Korea
3 Department of Physical Therapy, Kangwon National University, Samcheok-si, Republic of Korea

JaeHo Yu
‚úČ Department of Physical Therapy, Kangwon National University 3 Hwangjo-ri, Dogye-eup, Samcheok-si, Gangwon-do, 245-907, Republic of Korea
Email: naresa@empal.com
Publish Date
Received: 26-04-2012
Accepted: 14-06-2012
Published (online): 01-09-2012
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ABSTRACT

The aims of this study were to compare the activation of global and local muscles of the trunk during bridging with sling exercise (BSE), bridging with ball exercise (BBE), and normal bridging exercise (NBE) and to conduct and analyze these exercises in supine and prone positions to prove the effectiveness of sling exercises. Thirty patients with current low back pain (LBP) were recruited. In the supine and prone bridging exercise, each subject lifted their pelvis with their legs and feet in contact with the sling, ball, or normal surface. The electrical activities of the inferior oblique (IO), rectus abdominis (RA), multifidus (MF), and erector spinae (ES) muscles during the bridging exercises on the 3 surfaces were measured using surface electromyography (sEMG). For normalization, maximum sEMG signals were evaluated during each maximum voluntary isometric contraction (MVIC) maneuver. The root mean square during the exercise was normalized as a percentage of the MVIC (%MVIC). In the supine and prone positions, %MVIC of the IO, RA, MF, and ES during BSE was significantly higher than those during BBE and NBE (p < 0.05). In the supine position, %MVIC of the RA and ES during BBE was significantly higher than that during NBE (p < 0.05). In the prone position, all %MVIC during BBE were significantly higher than NBE (p < 0.05). These results verify the theory that the use of an unstable surface increases the activation of global and local trunk muscles during bridging exercises in the supine and prone positions. In conclusion, the use of BSE in a rehabilitation program may have therapeutic effects for patients with LBP by increasing trunk muscle activation.

Key words: Sling, bridging exercise, sEMG, local trunk muscle, global trunk muscle


           Key Points
  • Compared with the BBE and NBE, the BSE increased the %MVIC values of the IO, RA, MF, and ES muscles in the supine and prone positions in the patients with LBP.
  • We verified that activation of the global and local trunk muscles was increased by the use of unstable surfaces during the bridging exercises in the supine and prone positions.
  • The BSE was shown to be an effective exercise method for patients with LBP in a rehabilitation program by increasing trunk muscle activation.
 
 
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