
pmid: 17166666
In previous studies, blindfolded, healthy subjects exhibited an after-effect of leaning while standing on a horizontal surface after a period of standing on an inclined surface. We investigated whether this kinesthetic after-effect would transfer from one task to another by asking blindfolded subjects to stand on a horizontal surface after stepping-in-place on an incline. Results showed that all subjects demonstrated a forward trunk leaning after-effect lasting from half a minute to over 6 min after stepping on a 10 degrees -toes-up incline for 2.5 min. For 5/7 subjects, the amplitude of the leaning after-effect was very similar following stepping or standing on the inclined surface. The similarity of the post-incline lean between the standing and stepping conditions suggests a common underlying mechanism for the after-effect following standing and walking on a gradient and suggests that prolonged maintenance of a constant ankle or leg posture is not a prerequisite condition for the after-effect. The transfer of a postural effect built-up during a locomotor task to a postural after-effect during a standing task is consistent with a central adaptive mechanism that adjusts the surface-referenced set point for whole body postural orientation for both gait and posture.
Adult, Male, Posture, Walking, Middle Aged, Proprioception, Adaptation, Physiological, Illusions, Orientation, Humans, Female, Joints, Muscle, Skeletal, Gait, Kinesthesis, Postural Balance, Locomotion
Adult, Male, Posture, Walking, Middle Aged, Proprioception, Adaptation, Physiological, Illusions, Orientation, Humans, Female, Joints, Muscle, Skeletal, Gait, Kinesthesis, Postural Balance, Locomotion
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