Individuals with low back pain breathe differently than healthy individuals during a lifting task

• Published in: The journal of orthopaedic and sports physical therapy 2011-03, Vol.41 (3), p.141-148
• Main Authors: Hagins, Marshall, Lamberg, Eric M
• Format: Article
• Language: English
• Subjects: Adult; Age Factors; Analysis of Variance; Case-Control Studies; Disability Evaluation; Female; Humans; Lifting; Low Back Pain - physiopathology; Male; Middle Aged; Reproducibility of Results; Respiratory Physiological Phenomena; Surveys and Questionnaires
• ISSN: 0190-6011; 1938-1344
• DOI: 10.2519/jospt.2011.3437

Case control, repeated-measures, experimental laboratory study. To determine if, during a whole-body lifting task, individuals with low back pain (LBP) breathe differently than age-matched controls. Breath control may be optimized to provide increased intersegmental control of the lumbar spine through the generation of intra-abdominal pressure. Consequently, impairments in respiratory and trunk muscle coordination during lifting tasks may contribute to the occurrence or maintenance of LBP. Participants without LBP (n = 30) were matched by gender and age with those presenting with chronic mechanical LBP (n = 32) of at least 1 year in duration. Participants completed a total of 8 self-paced lifts of a crate from the floor to a table, with the crate empty during 4 of the lifts and loaded to 25% of the participant's body weight during 4 of the lifts. The amount of volume in the lungs, measured as a percentage of the individual's vital capacity (%VC), was identified at 9 points during the lifting task. A 2 × 2 × 2 × 9 (group by gender by load by time) mixed-model analysis of covariance (ANCOVA), with age as the covariate, was used to identify differences among conditions and groups of %VC used during the lift. Individuals with LBP performed the lifting task with more volume in their lungs (48.2 %VC) than healthy peers (40.9 %VC). Age significantly affected %VC used during the lift: with increasing age, participants with LBP increased inspired volume and participants without LBP decreased inspired volume. Individuals with LBP performed a lifting task with more inhaled lung volume than individuals without LBP. These findings are consistent with the theoretical link between breath control, intra-abdominal pressure, and lumbar segmental control.