The relationship between muscle size, obesity, body fat ratio, pain and disability in individuals with and without nonspecific low back pain.

AbstractPatients with nonspecific low back pain (NSLBP) may face motor control problemsand health disability barriers during various tasks. However, studies investigating theextent of these disadvantages, and possible associated factors are quite limited inpatients with NSLBP. To compare motor control performances and physical assessment domains between patients with NSLBP and asymptomatic controls. Twentyseven patients with NSBLP and 27 age- and sex-matched asymptomatic controls participated in this cross-sectional study. Ultrasonographic imaging was used to determine abdominal and multifidus muscles thicknesses and adipose tissue rate. Visualanalog scale was used to assess LBP severity. Body mass index (BMI) and OswestryDisability Index (ODI) scores of the participants were physical assessment domains ofLBP. BMI values were greater in the NSLBP group compared to the asymptomaticparticipants. ANCOVA revealed a significant interaction effect regarding externalabdominal oblique and multifidus lumborum muscles thickness, and abdominal adipose tissue (p = 0.015; p = 0.001; p = 0.006), respectively in terms of two groups.The thicknesses of these muscles were lesser in the NSLBP group compared with thecontrol group. Similarly, abdominal adipose tissue was higher in the NSLBP group.The stepwise multiple regression analysis demonstrated that the Oswestry Disability Index and abdominal adipose tissue rate were significant and independent factors of the low back pain severity with 73.5% of the variance. The study resultsindicate that increased disability and fat infiltration are possible determinantsinfluencing pain severity, although further research is required. Examining musculoskeletal properties of lumbar region could provide information about the limitationin patients with NSBLP.KEYWORDSabdominal muscles, adipose tissue, back pain, diagnostic imaging, paraspinal muscles