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Contributions of Muscle Elasticity and Lateral Slide of the Transversus Abdominis to Lumbar Stability.

CONTEXT
Lumbar instability can cause lumbar spondylolisthesis and chronic low-back pain in sports situation. Abdominal hollowing is commonly used in clinical practice to preferentially target the transversus abdominis (TrA) to stabilize the lumbar vertebrae; however, the contribution of muscle elasticity and lateral slide of the TrA to lumbar stability has not yet been clarified.


OBJECTIVE
To clarify the contribution of elasticity and lateral slide of the TrA to lumbar stability and to identify an effective exercise to stabilize the lumbar vertebrae.


DESIGN
Experimental study.


SETTING
Laboratory.


PATIENTS
A total of 29 healthy males participated in this study.


INTERVENTIONS
The participants performed hollowing during measurement of muscle elasticity of TrA and both knees extension from crook lying position for pelvic stability measurement.


MAIN OUTCOME MEASURES
Lumbar stability, muscle elasticity change ratio, and lateral slide amount of TrA.


RESULTS
There was a significant correlation between elasticity of the TrA and lumbar stability; however, no relationship was observed between lateral slide and lumbar stability or elasticity of the TrA.


CONCLUSION
Elasticity of the TrA and lumbar stability was significantly correlated; therefore, improving the tonicity of the TrA may stabilize the lumbar vertebrae in healthy individuals. Moreover, hollowing with maximum effort may be effective as training aimed to stabilize the lumbar vertebrae for physical dysfunction due to lumbar instability.