The Relationship Between the Side-Lying Endurance Test and Ultrasound Thickness Measurement for Abdominal Muscles

Background Low Back Pain (LBP) is a common musculoskeletal disorder in the different societies. Objectives The purpose of this study was to investigate the relationship between the side-lying endurance test and ultrasound thickness measurement of the anterolateral abdominal muscles. Patients and Methods A convenience sample of 55 subjects, aged 20 - 30 years, participated in this study. Endurance of abdominal muscles was measured using side-lying endurance test in all subjects. Ultrasound thickness measurement for the Transverses Abdominis (TVA), Internal Oblique (IO), and External Oblique (EO) muscles was performed on the right side at rest in supine position. Results The results of the Pearson correlation coefficient between the variables of the study showed no significant relationship between the side-lying endurance test and ultrasound thickness measurements of TVA (r = 0.06, P = 0.65), IO (r = 0.06, P = 0.62), and EO (r = 0.08, P = 0.54) muscles. The significance level of 0.05 was chosen. Conclusions It seems that there is no significant relationship between the side-lying endurance test and abdominal muscles thickness.