title: Speed influences on the scaling behavior of gait cycle fluctuations during treadmill running.
abstract: The current study examined the temporal structure of gait cycle fluctuations in running. Participants ran at 80%, 90%, 100%, 110% and 120% of preferred running speed for 8min trials. Kinematic and kinetic gait cycle variables were generated from ground reaction force data. Mean, SD and CV of the kinematic and kinetic variables changed linearly with speed, whereas U-shaped functions were found for the scaling exponent alpha in 5 of the 8 variables investigated. Our findings reveal that long range correlations are present in both kinetic and kinematic variables of the gait cycle. The dependent structure of the stride interval is reduced at preferred running speed and this is hypothesized to be related to the enhanced stability and flexibility of this gait speed.
authors.affiliation: Department of Integrative Physiology, The University of Colorado, Carlson 202G, Boulder, CO 80309, United States. kimberlee.jordan@colorado.edu
authors.forename: Kimberlee
authors.initials: K
authors.lastname: Jordan
authors.forename: John H
authors.initials: JH
authors.lastname: Challis
authors.forename: Karl M
authors.initials: KM
authors.lastname: Newell
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D001827:Body Height; D001835:Body Weight; D005080:Exercise Test; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans; D012420:Running / Q000502:physiology*