Pelvic and femoral contributions to bilateral hip flexion by subjects suspended from a bar

Dewberry, Michael J.; Bohannon, Richard W.; Tiberio, David; Murray, Richard W; Zannotti, Chad M.

doi:10.1016/s0268-0033(03)00096-2

Cited by 34 publications

(36 citation statements)

References 13 publications

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“…The pelvis is considered the base of the spine and its anteroposterior orientation affects the spinal sagittal curvatures (Levine and Whittle, 1996). Increased hamstring tension influences pelvic posture (Congdon et al, 2005; Dewberry et al, 2003) and spinal curvatures (López-Miñarro and Alacid, 2010). Alterations in sagittal spinal curvatures increase intervertebral stress (Beach et al, 2005) as well as thoracic and lumbar intradiscal pressure (Nachemson, 1976; Polga et al, 2004; Sato et al, 1999; Wilke et al, 1999), predisposing the subjects to spinal disorders (McGill, 2002).…”

Section: Introductionmentioning

confidence: 99%

Influence of Hamstring Muscles Extensibility on Spinal Curvatures and Pelvic Tilt in Highly Trained Cyclists

Muyor

Alacid

López-Miñarro

2011

Journal of Human Kinetics

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The purpose of this study was to determine the influence of hamstring muscles extensibility in standing, maximal trunk flexion with knees extended and on the bicycle in lower handlebar-hands position of highly trained cyclists. Ninety-six cyclists were recruited for the study (mean ± SD, age: 30.36 ± 5.98 years). Sagittal spinal curvatures and pelvic tilt were measured in the standing position, maximal trunk flexion with knees extended (sit-and-reach test) and while sitting on a bicycle in lower handlebar-hand position using a Spinal Mouse system. Hamstring muscles extensibility was determined in both legs by passive straight leg raise test (PSLR). The sample was divided into three groups according to PSLR angle: (1) reduced extensibility (PSLR < 80º; n = 30), (2) moderate hamstring extensibility group (PSLR = 80º – 90º; n = 35), and (3) high hamstring extensibility (PSLR = > 90º; n = 31). ANOVA analysis showed significant differences among groups for thoracic (p < 0.001) and pelvic tilt (p < 0.001) angles in the sit-and-reach test. No differences were found between groups for standing and on the bicycle position. Post hoc analysis showed significant differences in all pairwise comparisons for thoracic angle (p < 0.01) and pelvic angle (p < 0.001) in the sit-and-reach test. No differences were found in lumbar angle in any posture. In conclusion, the hamstring muscles extensibility influence the thoracic and pelvic postures when maximal trunk flexion with knees extended is performed, but not when cyclists are seated on their bicycles

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Section: Introductionmentioning

confidence: 99%

Influence of Hamstring Muscles Extensibility on Spinal Curvatures and Pelvic Tilt in Highly Trained Cyclists

Muyor

Alacid

López-Miñarro

2011

Journal of Human Kinetics

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“…In the posterior compartment changes in knee angle can have a profound effect on the hamstring length and/or tension and thereby influence the position of the pelvis. Dewberry et al [7] illustrated this point when they controlled hamstring length and knee position as independent variables while they examined the pelvifemoral ratio. Both hamstring length and knee position (flexed vs. extended) variables had significant effects on the pelvic contribution to hip flexion.…”

Section: Introductionmentioning

confidence: 99%

“…Further, the stresses and strains in the complex ligamentous system that connects the pelvis to the spine are also directly influenced by the degree of rotation of the pelvis in the sagittal plane. The degree of rotation of the pelvis, in turn, is governed somewhat by the 'pelvifemoral rhythm' [7,16] which describes the normal interactive motions of the pelvis and the femur. Since several of the muscles of the anterior and posterior compartments of the thigh span both the knee and hip joints, the knee joint flexion angle and muscle activations may affect this pelvifemoral rhythm.…”

Section: Introductionmentioning

confidence: 99%

Influence of knee angle and individual flexibility on the flexion–relaxation response of the low back musculature

Shin

Shu

et al. 2004

Journal of Electromyography and Kinesiology

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“…This then affects the range of motion of the lumbar and pelvis [3, 36]. Anterior pelvic tilt increases the hip extension tightness, but this lengthening of the muscles causes tension in the muscle [3, 36–38]. This tension increases the passive tensile loading on surrounding viscoelastic tissues, and prolonged tension can increase the risk of pain or discomfort [3, 4, 36].…”

Section: Discussionmentioning

confidence: 99%

Comparing the effects of different dynamic sitting strategies in wheelchair seating on lumbar-pelvic angle

Peng

Tseng

et al. 2016

BMC Musculoskelet Disord

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BackgroundProlonged static sitting in a wheelchair is associated with an increased risk of lower back pain. The wheelchair seating system is a key factor of this risk because it affects spinal loading in the sitting position. In this study, 7 dynamic sitting strategies (DSSs) are examined: lumbar prominent dynamic sitting (LPDS), back reclined dynamic sitting (BRDS), femur upward dynamic sitting (FUDS), lumbar prominent with back reclined dynamic sitting (LBDS), lumbar prominent with femur upward dynamic sitting (LFDS), back reclined with femur upward dynamic sitting (BFDS), and lumbar prominent with back reclined with femur upward dynamic sitting (LBFDS). The objective of this study was to analyze the biomechanical effects of these sitting strategies on lumbar-pelvic angles.MethodsTwenty able-bodied participants were recruited for the study. All participants performed LPDS, BRDS, FUDS, LBDS, LFDS, BFDS, and LBFDS in a random order. All lumbar-pelvic angle parameters, including the static lumbar angle, static pelvic angle, lumbar range of motion, and pelvic range of motion were measured and compared.ResultsResults show that LBDS and LBFDS enabled the most beneficial lumbar movements, although the difference between the 2 strategies was nonsignificant. BRDS and BFDS enabled the most beneficial pelvic movements, although the difference between the 2 strategies was nonsignificant. Among all the upright DSSs, LPDS and LFDS enabled the most beneficial lumbar and pelvic movements, although no significant difference was observed between these 2 strategies.ConclusionsWe identified the effects and differences among 7 DSSs on lumbar-pelvic angles. Wheelchair users can choose the most suitable DSS that meets their needs. These findings may serve as a reference for practicing physicians or wheelchair users to choose an appropriate dynamic wheelchair seating system.Trial registration ISRCTN12389808, 18th November 2016, retrospectively registered.

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Pelvic and femoral contributions to bilateral hip flexion by subjects suspended from a bar

Cited by 34 publications

References 13 publications

Influence of Hamstring Muscles Extensibility on Spinal Curvatures and Pelvic Tilt in Highly Trained Cyclists

Influence of Hamstring Muscles Extensibility on Spinal Curvatures and Pelvic Tilt in Highly Trained Cyclists

Influence of knee angle and individual flexibility on the flexion–relaxation response of the low back musculature

Comparing the effects of different dynamic sitting strategies in wheelchair seating on lumbar-pelvic angle

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