Leg stiffness increases with speed to modulate gait frequency and propulsion energy.

[1]  J. F. Yang,et al.  Surface EMG profiles during different walking cadences in humans. , 1985, Electroencephalography and clinical neurophysiology.

[2]  R. Blickhan The spring-mass model for running and hopping. , 1989, Journal of biomechanics.

[3]  R. B. Davis,et al.  Gait characterization via dynamic joint stiffness , 1996 .

[4]  C. T. Farley,et al.  Leg stiffness and stride frequency in human running. , 1996, Journal of biomechanics.

[5]  Herman van der Kooij,et al.  A multisensory integration model of human stance control , 1999, Biological Cybernetics.

[6]  K. Holt,et al.  The dynamics of gait in children with spastic hemiplegic cerebral palsy: Theoretical and clinical implications , 2000 .

[7]  P O Riley,et al.  Effect of age on lower extremity joint moment contributions to gait speed. , 2001, Gait & posture.

[8]  J. Donelan,et al.  Mechanical work for step-to-step transitions is a major determinant of the metabolic cost of human walking. , 2002, The Journal of experimental biology.

[9]  Rodger Kram,et al.  Simultaneous positive and negative external mechanical work in human walking. , 2002, Journal of biomechanics.

[10]  R. Peterka Sensorimotor integration in human postural control. , 2002, Journal of neurophysiology.

[11]  F. Horak,et al.  Postural feedback responses scale with biomechanical constraints in human standing , 2004, Experimental Brain Research.

[12]  Masayoshi Kubo,et al.  Increased musculoskeletal stiffness during load carriage at increasing walking speeds maintains constant vertical excursion of the body center of mass. , 2003, Journal of biomechanics.

[13]  A. Kuo An optimal state estimation model of sensory integration in human postural balance , 2005, Journal of neural engineering.

[14]  R. Blickhan,et al.  Spring-mass running: simple approximate solution and application to gait stability. , 2005, Journal of theoretical biology.

[15]  S. Collins,et al.  The advantages of a rolling foot in human walking , 2006, Journal of Experimental Biology.

[16]  Reinhard Blickhan,et al.  Compliant leg behaviour explains basic dynamics of walking and running , 2006, Proceedings of the Royal Society B: Biological Sciences.

[17]  S. Nadeau,et al.  Effects of cadence on energy generation and absorption at lower extremity joints during gait. , 2008, Clinical biomechanics.

[18]  Daniel P. Ferris,et al.  Walking with increased ankle pushoff decreases hip muscle moments. , 2008, Journal of biomechanics.

[19]  May Q. Liu,et al.  Muscle contributions to support and progression over a range of walking speeds. , 2008, Journal of biomechanics.

[20]  Torrence D. J. Welch,et al.  A feedback model reproduces muscle activity during human postural responses to support-surface translations. , 2008, Journal of neurophysiology.

[21]  Richard R Neptune,et al.  The effect of walking speed on muscle function and mechanical energetics. , 2008, Gait & posture.

[22]  J. Higginson,et al.  Dynamic knee joint stiffness in subjects with a progressive increase in severity of knee osteoarthritis. , 2009, Clinical biomechanics.

[23]  D. Thelen,et al.  A simple mass-spring model with roller feet can induce the ground reactions observed in human walking. , 2009, Journal of biomechanical engineering.

[24]  Sukyung Park,et al.  Postural feedback scaling deficits in Parkinson's disease. , 2009, Journal of neurophysiology.

[25]  Erik B Simonsen,et al.  Redistribution of joint moments during walking in patients with drop-foot. , 2010, Clinical biomechanics.

[26]  J. Higginson,et al.  Knee osteoarthritis affects the distribution of joint moments during gait. , 2011, The Knee.

[27]  Sukyung Park,et al.  A gravitational impulse model predicts collision impulse and mechanical work during a step-to-step transition. , 2011, Journal of biomechanics.