Coordination of leg swing, thorax rotations, and pelvis rotations during gait: The organisation of total body angular momentum

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    In walking faster than 3 km/h, transverse pelvic rotation lengthens the step ("pelvic step"). It is often assumed that the thorax then starts to counter rotate to limit total body angular momentum around the vertical. But the relative timing of pelvis and thorax rotation during gait is insufficiently understood. The present study aimed at analysing how transverse pelvis and thorax rotations relate to the movements of the upper leg, and how these patterns contribute to total body angular momentum. Nine healthy male volunteers walked on a treadmill at nine different velocities, ranging from 2.0 km/h to 5.2 km/h. Full body kinematics were recorded. Femur-pelvis, pelvis-thorax, and femur-thorax relative phase were calculated, as well as transverse plane angular momentum of all body segments. The shift in pelvis-thorax coordination from in-phase to out of phase with increasing velocity was found to depend on the pelvis beginning to move in-phase with the femur, while the thorax continued to counter rotate with respect to the femur. Moreover, pelvic and thoracic contributions to total body angular momentum were low (less than 10%), while contributions of the legs and arms were much larger (approximately 90%), suggesting that pelvis-thorax coordination is relatively unimportant to the organisation of total body angular momentum. Taken together, these results may imply that our understanding of the pelvic step need to be changed. Moreover, the alterations in pelvis-thorax relative phase that were reported for different locomotor pathologies may depend on different mechanisms. © 2007 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)455-462
    JournalGait and Posture
    Volume27
    Issue number3
    DOIs
    Publication statusPublished - 2008

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    Pelvis
    Gait
    Leg
    Thorax
    Femur
    Biomechanical Phenomena
    Walking
    Healthy Volunteers
    Arm
    Pathology

    Cite this

    @article{53738185b65e4017a2ce8b384d220967,
    title = "Coordination of leg swing, thorax rotations, and pelvis rotations during gait: The organisation of total body angular momentum",
    abstract = "In walking faster than 3 km/h, transverse pelvic rotation lengthens the step ({"}pelvic step{"}). It is often assumed that the thorax then starts to counter rotate to limit total body angular momentum around the vertical. But the relative timing of pelvis and thorax rotation during gait is insufficiently understood. The present study aimed at analysing how transverse pelvis and thorax rotations relate to the movements of the upper leg, and how these patterns contribute to total body angular momentum. Nine healthy male volunteers walked on a treadmill at nine different velocities, ranging from 2.0 km/h to 5.2 km/h. Full body kinematics were recorded. Femur-pelvis, pelvis-thorax, and femur-thorax relative phase were calculated, as well as transverse plane angular momentum of all body segments. The shift in pelvis-thorax coordination from in-phase to out of phase with increasing velocity was found to depend on the pelvis beginning to move in-phase with the femur, while the thorax continued to counter rotate with respect to the femur. Moreover, pelvic and thoracic contributions to total body angular momentum were low (less than 10{\%}), while contributions of the legs and arms were much larger (approximately 90{\%}), suggesting that pelvis-thorax coordination is relatively unimportant to the organisation of total body angular momentum. Taken together, these results may imply that our understanding of the pelvic step need to be changed. Moreover, the alterations in pelvis-thorax relative phase that were reported for different locomotor pathologies may depend on different mechanisms. {\circledC} 2007 Elsevier B.V. All rights reserved.",
    author = "S.M. Bruijn and O.G. Meijer and {van Dieen}, J.H. and I. Kingma and C.J.C. Lamoth",
    year = "2008",
    doi = "10.1016/j.gaitpost.2007.05.017",
    language = "English",
    volume = "27",
    pages = "455--462",
    journal = "Gait and Posture",
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    Coordination of leg swing, thorax rotations, and pelvis rotations during gait: The organisation of total body angular momentum. / Bruijn, S.M.; Meijer, O.G.; van Dieen, J.H.; Kingma, I.; Lamoth, C.J.C.

    In: Gait and Posture, Vol. 27, No. 3, 2008, p. 455-462.

    Research output: Contribution to JournalArticleAcademicpeer-review

    TY - JOUR

    T1 - Coordination of leg swing, thorax rotations, and pelvis rotations during gait: The organisation of total body angular momentum

    AU - Bruijn, S.M.

    AU - Meijer, O.G.

    AU - van Dieen, J.H.

    AU - Kingma, I.

    AU - Lamoth, C.J.C.

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    N2 - In walking faster than 3 km/h, transverse pelvic rotation lengthens the step ("pelvic step"). It is often assumed that the thorax then starts to counter rotate to limit total body angular momentum around the vertical. But the relative timing of pelvis and thorax rotation during gait is insufficiently understood. The present study aimed at analysing how transverse pelvis and thorax rotations relate to the movements of the upper leg, and how these patterns contribute to total body angular momentum. Nine healthy male volunteers walked on a treadmill at nine different velocities, ranging from 2.0 km/h to 5.2 km/h. Full body kinematics were recorded. Femur-pelvis, pelvis-thorax, and femur-thorax relative phase were calculated, as well as transverse plane angular momentum of all body segments. The shift in pelvis-thorax coordination from in-phase to out of phase with increasing velocity was found to depend on the pelvis beginning to move in-phase with the femur, while the thorax continued to counter rotate with respect to the femur. Moreover, pelvic and thoracic contributions to total body angular momentum were low (less than 10%), while contributions of the legs and arms were much larger (approximately 90%), suggesting that pelvis-thorax coordination is relatively unimportant to the organisation of total body angular momentum. Taken together, these results may imply that our understanding of the pelvic step need to be changed. Moreover, the alterations in pelvis-thorax relative phase that were reported for different locomotor pathologies may depend on different mechanisms. © 2007 Elsevier B.V. All rights reserved.

    AB - In walking faster than 3 km/h, transverse pelvic rotation lengthens the step ("pelvic step"). It is often assumed that the thorax then starts to counter rotate to limit total body angular momentum around the vertical. But the relative timing of pelvis and thorax rotation during gait is insufficiently understood. The present study aimed at analysing how transverse pelvis and thorax rotations relate to the movements of the upper leg, and how these patterns contribute to total body angular momentum. Nine healthy male volunteers walked on a treadmill at nine different velocities, ranging from 2.0 km/h to 5.2 km/h. Full body kinematics were recorded. Femur-pelvis, pelvis-thorax, and femur-thorax relative phase were calculated, as well as transverse plane angular momentum of all body segments. The shift in pelvis-thorax coordination from in-phase to out of phase with increasing velocity was found to depend on the pelvis beginning to move in-phase with the femur, while the thorax continued to counter rotate with respect to the femur. Moreover, pelvic and thoracic contributions to total body angular momentum were low (less than 10%), while contributions of the legs and arms were much larger (approximately 90%), suggesting that pelvis-thorax coordination is relatively unimportant to the organisation of total body angular momentum. Taken together, these results may imply that our understanding of the pelvic step need to be changed. Moreover, the alterations in pelvis-thorax relative phase that were reported for different locomotor pathologies may depend on different mechanisms. © 2007 Elsevier B.V. All rights reserved.

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