Relationship between lumbar lordosis, pelvic tilt and ultrasonic thickness of abdominal wall muscles in healthy young women

According to importance of healthy posture and high prevalence of all kinds of faulty postures among young population, study of etiological factors is necessary. The aim of this study was to evaluate the relationship between lumbar lordosis and pelvic inclination with ultrasonic thickness of abdominal wall muscles in healthy young females. 76 healthy young female, ages ranged 18-30 years participated in this study voluntarily. After collecting demographic information, flexible ruler and inclinometer were used for measuring the degree of lumbar lordosis and pelvic inclination respectively. Then, the rest thickness of abdominal wall muscles were measured in two different positions of crook lying and standing by using ultrasonography. The Pearson correlation coefficient was used for statistical analysis. Results revealed significant statistical relationship between lumbar lordosis and pelvic inclination (p=0.03(. Among abdominal muscles, only transverse abdominis muscle showed a negative correlation with lumbar lordosis during standing (p= -0.02). There was not statistical relationship between abdominal muscle thickness and pelvic inclination. Based on the findings of this study, there is a direct relationship between lumbar lordosis and pelvic tilt, but rest thickness of the abdominal wall muscles except the transverse abdominis muscle, has no significant effect on lumbar lordosis.