Influences of h and medium latency reflex responses of the soleus muscle while receiving with malleolus vibration during upright standing

Masahiro Sakita, Shinichiro Murakami, Takafumi Saito, Shuzo Kumagai

    Research output: Contribution to journalArticlepeer-review

    Abstract

    [Purpose] This study investigated whether afferent signals from ankle articular receptors affect the reflexive activity of the soleus muscle of participants while standing upright. [Methods] The subjects, 14 male healthy adults, stood in an upright position on an electric tilting table. Vibrations (about 90 Hz) were applied to the medial and lateral malleolus of the pivot leg (left leg of all subjects), and for the control condition the vibrators were turned off. The maximum M, H and medium latency reflex amplitudes and latencies were extracted from collected M, H and medium latency reflex (MLR) waves under both conditions. The mean amplitudes and latencies of maximum H and MLR were normalized using each subject's maximum M and height, respectively. [Results] The amplitudes and latencies of maximum H and MLR significantly decreased and were delayed under the malleolus vibration condition compared to the control condition. [Conclusion] We conclude that disynaptic inhibition of group I and II afferent fibers from the ankle joint provoke a decrease in the excitation of the α motoneurons of the soleus. It seems that a supraspinal center hardly regulates the excitability of the α motoneurons of the soleus or group II interneurons when the subject can predict how to maintain standing stability.

    Original languageEnglish
    Pages (from-to)1041-1045
    Number of pages5
    JournalJournal of Physical Therapy Science
    Volume24
    Issue number10
    DOIs
    Publication statusPublished - 2012

    All Science Journal Classification (ASJC) codes

    • Physical Therapy, Sports Therapy and Rehabilitation

    Fingerprint Dive into the research topics of 'Influences of h and medium latency reflex responses of the soleus muscle while receiving with malleolus vibration during upright standing'. Together they form a unique fingerprint.

    Cite this