title: Increasing trunk flexion transforms human leg function into that of birds despite different leg morphology.
abstract: Pronograde trunk orientation in small birds causes prominent intra-limb asymmetries in the leg function. As yet, it is not clear whether these asymmetries induced by the trunk reflect general constraints on the leg function regardless of the specific leg architecture or size of the species. To address this, we instructed 12 human volunteers to walk at a self-selected velocity with four postures: regular erect, or with 30 deg, 50 deg and maximal trunk flexion. In addition, we simulated the axial leg force (along the line connecting hip and centre of pressure) using two simple models: spring and damper in series, and parallel spring and damper. As trunk flexion increases, lower limb joints become more flexed during stance. Similar to birds, the associated posterior shift of the hip relative to the centre of mass leads to a shorter leg at toe-off than at touchdown, and to a flatter angle of attack and a steeper leg angle at toe-off. Furthermore, walking with maximal trunk flexion induces right-skewed vertical and horizontal ground reaction force profiles comparable to those in birds. Interestingly, the spring and damper in series model provides a superior prediction of the axial leg force across trunk-flexed gaits compared with the parallel spring and damper model; in regular erect gait, the damper does not substantially improve the reproduction of the human axial leg force. In conclusion, mimicking the pronograde locomotion of birds by bending the trunk forward in humans causes a leg function similar to that of birds despite the different morphology of the segmented legs.
authors.affiliation: Department of Motion Science, Institute of Sport Sciences, Friedrich Schiller University Jena, Seidelstraße 20, Jena 07740, Germany soran.aminiaghdam@uni-jena.de.
authors.forename: Soran
authors.identifier: http://orcid.org/0000-0001-9310-6768
authors.initials: S
authors.lastname: Aminiaghdam
authors.affiliation: Department of Motion Science, Institute of Sport Sciences, Friedrich Schiller University Jena, Seidelstraße 20, Jena 07740, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Rode
authors.affiliation: Department of Motion Science, Institute of Sport Sciences, Friedrich Schiller University Jena, Seidelstraße 20, Jena 07740, Germany.
authors.forename: Roy
authors.initials: R
authors.lastname: Müller
authors.affiliation: Department of Motion Science, Institute of Sport Sciences, Friedrich Schiller University Jena, Seidelstraße 20, Jena 07740, Germany.
authors.forename: Reinhard
authors.initials: R
authors.lastname: Blickhan
mesh_terms: D000328:Adult; D000818:Animals; D001696:Biomechanical Phenomena; D001717:Birds / Q000033:anatomy & histology / Q000502:physiology; D004576:Electromyography; D005260:Female; D005684:Gait; D006801:Humans; D007596:Joints / Q000033:anatomy & histology / Q000502:physiology; D007866:Leg / Q000033:anatomy & histology / Q000502:physiology*; D035002:Lower Extremity / Q000033:anatomy & histology / Q000502:physiology; D008297:Male; D008954:Models, Biological; D011187:Posture; D016059:Range of Motion, Articular; D016138:Walking; D055815:Young Adult
keywords: Able-bodied walking; Asymmetry; Leg model; Posture; Trunk orientation