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

in Journal of Sport Rehabilitation
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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.

Shimizu is with the Department of Physical Therapy, Fukui General Clinic, Fukui, Japan; and the Division of Health Sciences, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan. Miaki, Nakagawa, and Yamazaki are with the Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan. Mizuno is with the Department of Orthopaedics, Fukui General Hospital, Fukui, Japan. Azuma is with the Department of Rehabilitation Physical Therapy, Faculty of Health Science, Fukui Health Science University, Fukui, Japan; and the Division of Health Sciences, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan.

Shimizu (yumenokyuusaku@hotmail.com) is corresponding author.
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