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Postural effects on intra-abdominal pressure during Valsalva maneuver
G D Goldish1, J E Quast, J J Blow
1Department of Physical Medicine and Rehabilitation, Veterans Administration Medical Center, Minneapolis, MN 55417.
Archives of Physical Medicine and Rehabilitation
|March 1, 1994
Summary
Trunk rotation significantly reduces intra-abdominal pressure during heavy lifting. This compromises spinal stability, increasing the risk of twisting-related low-back injuries.
Area of Science:
- Biomechanics
- Spinal Health
- Occupational Safety
Background:
- Trunk muscles create a rigid cylinder during lifting, enhancing spinal stability.
- Twisting motions are a common cause of low-back injuries.
Purpose of the Study:
- To investigate if trunk rotation decreases spinal extrinsic stability.
- To quantify the effect of trunk rotation on intra-abdominal pressure during a Valsalva maneuver.
Main Methods:
- Eight healthy volunteers performed maximum effort Valsalva maneuvers in various trunk postures.
- Intra-abdominal pressure (IAP max) was measured during standing, forward flexion, and with trunk rotation.
Main Results:
- IAP max was significantly lower during standing with trunk rotation compared to standing straight (p < 0.05).
- IAP max was significantly lower during forward flexion with trunk rotation compared to forward flexion alone (p < 0.01).
Conclusions:
- Trunk rotation adversely affects the ability to generate intra-abdominal pressure.
- Spinal extrinsic stability is compromised during trunk rotation, potentially contributing to twisting-related back injuries.