الفهرس 
Relationship between hamstring length and gluteus maximus strength with and without normalization in patients with mechanical low back pain
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Abstract
Background. Muscle strength is an important tool for the assessment of muscle function and strongly influenced by body size.Therefore, utilization of strength body-size-independent measurements for muscle strength test is important in comparing the strength measured in large populations. Mechanical low back pain (LBP) is the commonest musculoskeletal disorders in clinical practice and is associated with gluteus maximus (GM) weakness and hamstring tightness. Objective. This study aimed to determine the correlation between hamstring length and GM strength with and without normalization in mechanical LBP patients. Methods. Seventy-three patients diagnosed with mechanical LBP participated in this study. First, GM strength was measured isometrically as a force (kg) and then converted to torque (Nm). GM strength was normalized for body weight (BW) and height (H) using the following formula: % (body weight {u00D7} h) = torque (N {u00D7} m) {u00D7}100 / body weight (N) {u00D7} h (m), then the hamstring length was measured using the active knee extension (AKE) test. Results.The study population consisted of 38 females and 35 males with mean age, body mass (BM), and H values of 31.42±6.78 years, 75.63±12.77 kg/m2, and 170.43±9.24 cm, respectively.The Spearman product-moment correlation between hamstring length and GM strength revealed that there was a positive strong correlation (p<0.05) between hamstring length and GM strength with and without normalization