Single joint perturbation during gait: neuronal control of movement trajectory

The aim of this study was to investigate the effect of single joint displacement on the pattern of leg muscle electromyographic (EMG) activity during locomotion. For the first time, unilateral rotational hip or knee joint displacements were applied by a driven orthotic device at three phases of swing during locomotion on a treadmill. The response pattern of bilateral leg muscle activation with respect to the timing and selection of muscles was almost identical for displacements of upper (hip joint) or lower (knee joint) leg. The leg muscle EMG responses were much stronger when the displacement was directed against the physiological movement trajectory, compared with when the displacement was reinforcing, especially during mid swing. It is suggested that these response patterns are designed to restore physiological movement trajectory rather than to correct a single joint position. Displacements released at initial or terminal swing, assisting or resisting the physiological movement trajectory, were followed by similar and rather unspecific response patterns. This was interpreted as being directed to stabilise body equilibrium.

[1]  Jaynie F. Yang,et al.  Interlimb co‐ordination in human infant stepping , 2001, The Journal of physiology.

[2]  V. Dietz,et al.  Compensatory movements following gait perturbations: changes in cinematic and muscular activation patterns. , 1986, International journal of sports medicine.

[3]  N. Petersen,et al.  Flexor reflex afferents reset the step cycle during fictive locomotion in the cat , 1998, Experimental Brain Research.

[4]  V. Dietz.  Do human bipeds use quadrupedal coordination? , 2002, Trends in Neurosciences.

[5]  V. Dietz,et al.  Interlimb coordination of leg-muscle activation during perturbation of stance in humans. , 1989, Journal of neurophysiology.

[6]  D J Kriellaars,et al.  Mechanical entrainment of fictive locomotion in the decerebrate cat. , 1994, Journal of neurophysiology.

[7]  G. M. Ghori,et al.  Pattern of reflex responses in lower limb muscles to a resistance in walking man , 2006, European Journal of Applied Physiology and Occupational Physiology.

[8]  J. Quintern,et al.  Obstruction of the swing phase during gait: phase-dependent bilateral leg muscle coordination , 1986, Brain Research.

[9]  J Quintern,et al.  Stumbling reactions in man: significance of proprioceptive and pre‐programmed mechanisms. , 1987, The Journal of physiology.

[10]  J. F. Yang,et al.  Transient disturbances to one limb produce coordinated, bilateral responses during infant stepping. , 1998, Journal of neurophysiology.

[11]  V. Dietz,et al.  Stumbling reactions in man: release of a ballistic movement pattern , 1986, Brain Research.

[12]  V. Dietz,et al.  Treadmill training of paraplegic patients using a robotic orthosis. , 2000, Journal of rehabilitation research and development.

[13]  V. Dietz.  Human neuronal control of automatic functional movements: interaction between central programs and afferent input. , 1992, Physiological reviews.

[14]  S. Grillner,et al.  Peripheral control of the cat's step cycle. II. Entrainment of the central pattern generators for locomotion by sinusoidal hip movements during "fictive locomotion.". , 1983, Acta physiologica Scandinavica.

[15]  W. Zijlstra,et al.  Adaptational and learning processes during human split-belt locomotion: interaction between central mechanisms and afferent input , 2004, Experimental Brain Research.

[16]  K. Pearson,et al.  Corrective responses to loss of ground support during walking. II. Comparison of intact and chronic spinal cats. , 1994, Journal of neurophysiology.

[17]  J. F. Yang,et al.  The initiation of the swing phase in human infant stepping: importance of hip position and leg loading , 2000, The Journal of physiology.

[18]  K. Pearson,et al.  Contribution of hind limb flexor muscle afferents to the timing of phase transitions in the cat step cycle. , 1996, Journal of neurophysiology.

[19]  T. Sinkjaer,et al.  Soleus stretch reflex modulation during gait in humans. , 1996, Journal of neurophysiology.

[20]  Keir G. Pearson,et al.  Early corrective reactions of the leg to perturbations at the torso during walking in humans , 2000, Experimental Brain Research.

[21]  S. Rossignol,et al.  On the initiation of the swing phase of locomotion in chronic spinal cats , 1978, Brain Research.

[22]  M. Gorassini,et al.  Corrective responses to loss of ground support during walking. I. Intact cats. , 1994, Journal of neurophysiology.