Neurophysiology

, Volume 26, Issue 2, pp 65–71 | Cite as

Hysteresis aftereffects in human single-joint voluntary movements

  • A. N. Tal'nov
  • A. I. Kostyukov
Article
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Abstract

The single-joint voluntary plantar flexion in the ankle joint of humans was tested with an external load perturbation consisting of two opposite sinus half-waves. Pronounced manifestations of hysteresis were found in the dependence of the joint angle on the external load torque. In particular, the hysteresis displayed itself as an increase in joint stiffness following changes in the direction of movement. It led to the ambiguity of the equilibrium values of the joint angle. With goal-directed voluntary single-joint flexion and extension movements under isotonic conditions due to the corresponding changes in activation of flexor muscles only (without the activation of extensors), the hysteresis manifested itself as the uncertainty of the joint-angle dependence on the efferent activity coming to flexors during movement phases with varying prehistory. The importance of sensory information for the mechanism compensating hysteresis effects was demonstrated. The possible ways of regulation of efferent activity of the motoneuronal pools generating central motor commands in the presence of hysteresis of muscle contraction are discussed.

Keywords

External Load Joint Angle Motor Command Plantar Flexion Joint Stiffness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • A. N. Tal'nov
    • 1
  • A. I. Kostyukov
    • 1
  1. 1.Bogomolets Institute of PhysiologyNational Academy of Sciences of UkraineKievUkraine

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