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Postural effects on intra-abdominal pressure during Valsalva maneuver. 1994

G D Goldish, and J E Quast, and J J Blow, and M A Kuskowski
Department of Physical Medicine and Rehabilitation, Veterans Administration Medical Center, Minneapolis, MN 55417.

When lifting heavy loads, trunk muscle contraction converts the abdominal and thoracic cavities into a nearly rigid-walled cylinder that provides increased extrinsic stability and allows partial transfer of load away from the spine. Because twisting is a common mechanism of low-back injuries, this study was undertaken to determine if trunk rotation results in a decrease in the extrinsic stability of the spine. We studied the effects of changes in trunk posture on intra-abdominal pressure generated during a maximum effort Valsalva's maneuver (IAP max) in eight healthy volunteers. IAP max during standing combined with trunk rotation was found to be significantly lower than IAP max during standing straight (p < 0.05). IAP max during forward flexion combined with trunk rotation was significantly lower than during forward flexion (p < 0.01). The results of our study indicate that trunk rotation adversely effects the ability to perform a Valsalva's maneuver. We conclude that extrinsic stability of the spine is at a biomechanical disadvantage when the trunk is rotated and thus may be a contributing factor to twisting-type back injuries.

UI MeSH Term Description Entries
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D011187 Posture The position or physical attitude of the body. Postures
D011312 Pressure A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) Pressures
D004576 Electromyography Recording of the changes in electric potential of muscle by means of surface or needle electrodes. Electromyogram,Surface Electromyography,Electromyograms,Electromyographies,Electromyographies, Surface,Electromyography, Surface,Surface Electromyographies
D005069 Evaluation Studies as Topic Works about studies that determine the effectiveness or value of processes, personnel, and equipment, or the material on conducting such studies. Critique,Evaluation Indexes,Evaluation Methodology,Evaluation Report,Evaluation Research,Methodology, Evaluation,Pre-Post Tests,Qualitative Evaluation,Quantitative Evaluation,Theoretical Effectiveness,Use-Effectiveness,Critiques,Effectiveness, Theoretical,Evaluation Methodologies,Evaluation Reports,Evaluation, Qualitative,Evaluation, Quantitative,Evaluations, Qualitative,Evaluations, Quantitative,Indexes, Evaluation,Methodologies, Evaluation,Pre Post Tests,Pre-Post Test,Qualitative Evaluations,Quantitative Evaluations,Report, Evaluation,Reports, Evaluation,Research, Evaluation,Test, Pre-Post,Tests, Pre-Post,Use Effectiveness
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000005 Abdomen That portion of the body that lies between the THORAX and the PELVIS. Abdomens
D000009 Abdominal Muscles Muscles forming the ABDOMINAL WALL including RECTUS ABDOMINIS; ABDOMINAL OBLIQUE MUSCLES, transversus abdominis, pyramidalis muscles and quadratus abdominis. Cremaster Muscle,Pyramidalis Muscle,Quadratus Abdominis,Transverse Abdominal,Transversus Abdominis,Abdominal Muscle,Abdominal, Transverse,Abdominals, Transverse,Abdomini, Quadratus,Abdominis, Quadratus,Cremaster Muscles,Muscle, Abdominal,Muscle, Cremaster,Muscle, Pyramidalis,Muscles, Abdominal,Muscles, Cremaster,Muscles, Pyramidalis,Pyramidalis Muscles,Quadratus Abdomini,Transverse Abdominals
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D001416 Back Pain Acute or chronic pain located in the posterior regions of the THORAX; LUMBOSACRAL REGION; or the adjacent regions. Backache,Back Ache,Back Pain with Radiation,Back Pain without Radiation,Vertebrogenic Pain Syndrome,Ache, Back,Aches, Back,Back Aches,Back Pains,Backaches,Pain Syndrome, Vertebrogenic,Pain Syndromes, Vertebrogenic,Pain, Back,Pains, Back,Syndrome, Vertebrogenic Pain,Syndromes, Vertebrogenic Pain,Vertebrogenic Pain Syndromes

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