背景與目的：下背痛對現代人而言是十分常見的病症，而物理治療師時常藉由評估患者站立時的姿勢，來決定教導病人執行如腹肌肌力訓練或膕旁肌和下背肌群的伸展運動。由於有關上述運動迄今仍缺乏足夠的實證來證實腰椎姿勢與相關肌肉之肌力或長度間的相關性，故本研究希望能藉由分析腹肌肌力、膕旁肌長度、腰椎前彎活動度與骨盆傾斜和腰椎前凸在放鬆站姿下彼此之間的相關性，希望能夠藉由實驗來找出支持的證據。方法，本研究收集了9男9女一共18位20至35歲的健康受試者，分別執行腹肌肌力、膕旁肌長度、腰椎前彎活動度、骨盆前傾和腰椎前凸程度的測試，再使用Pearson相關係數統計法來檢驗各變數間的相關性。結果：腹肌肌力與骨盆前傾和腰椎前凸間有中度正相關性存在（相關係數分別為0.51和0.51, P<0.05）；膕旁肌長度與骨盆前傾和腰椎前凸之間均沒有相關性（相關係數分別為-0.23和-0.05, P>0.05）；腰椎前彎活動度與骨盆前傾間沒有相關性（相關係數為0.15, P>0.05），腰椎前彎活動度與腰椎前凸間則有中度相關性（相關係數為0.40, P<0.05）。討論：本研究發現腹肌肌力較大者，其腰椎前凸程度或骨盆前傾角度也較大。但膕旁肌長度與骨盆前傾和腰椎前凸之間與腰椎前彎活動度與骨盆前傾間並無相關性。腰椎前彎活動度與腰椎前凸間有中度的正相關性存在。姿勢是由諸多因子共同作用造成的結果，例如骨骼構造、體重與體型、性別與年齡、以及社會文化上的取向等均會對姿勢產生影響。未來研究應招募更多受試者及下背痛患者，以針對各種影響因素做更多探討，才能釐清其中的關係。

Background and Purposes: Low back pain is one of the most prevalent problems in modern living. Physical therapists often teach their patients abdominal muscle strengthening exercises and hamstring and low back stretching exercises as means of altering standing posture although little substantial evidence exists to support such treatment. The purpose of this study was to determine if abdominal muscle strength (ABDS), hamstrings length (HAML), and lumbar spine mobility (LMOB) had any relationship to the degrees of pelvic tilt (PTLT) and lumbar spine lordosis (LRDS) during relaxed standing. Method: Eighteen healthy subjects (9 females and 9 males) ranging in ages from 20 to 35 years were recruited on a volunteer basis for this study. Measurements of the ABDS, HAML, LMOB, PTLT, and LRDS were performed. The relationships between each pair of the measurement variables were determined using the Pearson product-moment correlation coefficients. Results: The results revealed a moderate positive correlation between ABDS and PTLT (r=0.51, p<0.05), between ABDS and LRDS (r=0.51, p<0.05), and between LMOB and LRDS (r=0.40, p<0.05) No correlation was found either between HAML and PTLT (r=-0.23, p>0.05) or between LMOB and PTLT (r=0.15, p>0.05). No relationship was found between HAML and LRDS (r=-0.05, p>0.05). Conclusions: The extents of pelvic anterior tilt and lumbar lordosis are moderately correlated with the abdominal muscle strength. The hamstring length had no influence on the extents of pelvic anterior tilt and lumbar lordosis. The lumbar spine mobility has no correlation with pelvic anterior tilt, but moderately related to the extent of lumbar lordosis although the relationship between them may be also attributed to the influence from other factors.