Lumbar lordosis and pelvic inclination of asymptomatic adults

  • Youdas J
  • Garrett T
  • Harmsen S
 et al. 
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Background and Purpose. We examined the association between pelvic inclination and lumbar lordosis during relaxed standing and eight variables thought to contribute to lordosis. Subjects. Ninety subjects (45 Inen, 45 women) without back pain or a history of surgery were examined. The mean age was 54.8 years (SD=8.5) for male subjects and 58.9 years (SD=8.8) for female subjects. Methods. Multiple linear regression modeling was used to assess the association of pelvic inclination and size of lumbar lordosis in a standing position with age, gender, body mass index, physical activity level, back and onejoint hip flexor muscle length, and performance and length of abdominal muscles. Results. Abdominal muscle performance was associated with angle of pelvic inclination for women (@=.23), but not for men. Standing lumbar lordosis was associated with abdominal muscle length in women (f?=.40), but it was multivariately associated with length of abdominal and one-joint hip flexor muscles and physical activity level in men (@=.38). No correlation was found between angle of pelvic inclination and depth of lumbar lordosis in a standing position. Conclusion and Discussion. Neither univariate nor multivariate regres-sion ~rlodels account for variability in the angle of pelvic inclination or size of lumbar lordosis in adults during upright stance; no correlation was found in standing between these two variables. The use of abdominal muscle strengthening exercises or stretching exercises of the back and one-joint hip flexor muscles to correct faulty standing posture should be questioned. [Youdas JW, Garrett TR, Harmsen S, et al. Lumbar lordosis and pelvic inclination of asymptomatic adults. n assumption often made by physical thera-pists and others is that the size of the lumbar lordotic curve and the degree of pelvic incli-nation in a standing position are associated with the muscle lengths of the sagittal-plane pelvic rotators and the performance (strength) of the abdom-inal muscles.' Such assumed relationships are based o n the anat'omy of the muscles and their potential actions on the pelvis. The abdominal muscles tilt the pelvis p~steriorly,~,+hereas the lumbar erector spinae mus-cles tilt it anteriorly.' When a person tilts the pelvis posteriorly in a standing position, lumbar lordosis decrease^.^ The lengths of the lumbar erector spinae

Author-supplied keywords

  • Kinesiology/biomechanics
  • Muscle length
  • Muscle performance
  • Muscles
  • Trunk mobility

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  • James CareyUniversity of Minnesota - Twin Cities

  • J. W. Youdas

  • T. R. Garrett

  • S. Harmsen

  • V. J. Suman

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