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The H-reflex is a reflectory reaction of muscles after electrical stimulation of sensory fibers (Ia afferents stemming from muscle spindles) in their innervating nerves (for example, those located behind the knee).

H-reflex is analogous to the mechanically induced spinal stretch reflex (for example, knee jerk reflex) because both cases muscle-spindle innervating fibers are activated.

H-reflex is used to assess fitness of astronauts. H-reflex was the first medical experiment completed on the International Space Station.


It was first described by Paul Hoffmann (hence the name) in 1910. [1]

See also


  1. ^ Hoffmann P. Beitrag zur Kenntnis der menschlichen Reflexe mit besonderer Berucksichtigung der elektrischen Erscheinungen. Arch Anat Physiol. 1910;1:223–246.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "H-reflex". A list of authors is available in Wikipedia.
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