Get access

Soleus H-reflex operant conditioning changes the H-reflex recruitment curve

Authors

  • Aiko K. Thompson PhD,

    Corresponding author
    1. Wadsworth Center, Division of Translational Medicine, Laboratory of Neural Injury and Repair, New York State Department of Health, Albany, New York, USA
    2. Department of Biomedical Sciences, State University of New York, Albany, New York, USA
    3. Department of Neurology, Columbia University College of Physicians and Surgeons, New York, New York, USA
    • Helen Hayes Hospital, New York State Department of Health, West Haverstraw, New York, USA
    Search for more papers by this author
  • Xiang Yang Chen PhD,

    1. Wadsworth Center, Division of Translational Medicine, Laboratory of Neural Injury and Repair, New York State Department of Health, Albany, New York, USA
    2. Department of Biomedical Sciences, State University of New York, Albany, New York, USA
    Search for more papers by this author
  • Jonathan R. Wolpaw MD

    1. Helen Hayes Hospital, New York State Department of Health, West Haverstraw, New York, USA
    2. Wadsworth Center, Division of Translational Medicine, Laboratory of Neural Injury and Repair, New York State Department of Health, Albany, New York, USA
    3. Department of Biomedical Sciences, State University of New York, Albany, New York, USA
    4. Department of Neurology, Columbia University College of Physicians and Surgeons, New York, New York, USA
    Search for more papers by this author

Correspondence to: A. K. Thompson; e-mail: thompsona@helenhayeshosp.org

Abstract

Introduction: Operant conditioning can gradually change the human soleus H-reflex. The protocol conditions the reflex near M-wave threshold. In this study we examine its impact on the reflexes at other stimulus strengths. Methods: H-reflex recruitment curves were obtained before and after a 24-session exposure to an up-conditioning (HRup) or a down-conditioning (HRdown) protocol and were compared. Results: In both HRup and HRdown subjects, conditioning affected the entire H-reflex recruitment curve. In 5 of 6 HRup and 3 of 6 HRdown subjects, conditioning elevated (HRup) or depressed (HRdown), respectively, the entire curve. In the other HRup subject or the other 3 HRdown subjects, the curve was shifted to the left or to the right, respectively. Conclusions: H-reflex conditioning does not simply change the H-reflex to a stimulus of particular strength; it also changes the H-reflexes to stimuli of different strengths. Thus, it is likely to affect many actions in which this pathway participates. Muscle Nerve 47: [?show $1534v]–[?show $1535v], 2013

Get access to the full text of this article

Ancillary