Contraction Times of Twitches Evoked by H-Reflexes

Authors

  • Fritz Buchthal,

    1. Institute of Neurophysiology, University of Copenhagen, Denmark
    Search for more papers by this author
  • Henning Schmalbruch

    1. Institute of Neurophysiology, University of Copenhagen, Denmark
    Search for more papers by this author
    • 1

      Working under a fellowship from the Rask-Ørsted Foundation, Copenhagen and the Ernst Poensgen-Stiftung, Düsseldorf, on leave from the Institute of Biophysics and Electronmicroscopy, University of Düsseldorf.


Abstract

Isometric twitches of the same amplitude were initiated in the human soleus muscle by near threshold H-reflexes and by stimuli to the efferent nerve (M-responses) or to the end-plate zone. The time to peak-force was longer in reflex than in directly activated twitches: The range was 84 to 130 msec and 52 to 100 msec, respectively (36–37°C).

Ancillary