H-reflex

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

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.

History

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

External links

MeSH H-Reflex

References

↑ Hoffmann P. Beitrag zur Kenntnis der menschlichen Reflexe mit besonderer Berucksichtigung der elektrischen Erscheinungen. Arch Anat Physiol. 1910;1:223–246.

de:H-Reflex

v • d • e Nervous system physiology: neurophysiology - reflex
Cranial nerve	midbrain: Pupillary light reflex - Accommodation reflex pons/medulla: Jaw jerk reflex - Corneal reflex - Caloric reflex test/Vestibulo-ocular reflex - Gag reflex
Tendon reflexes	upper limb: Biceps reflex - Brachioradialis reflex - Extensor digitorum reflex - Triceps reflex lower limb: Patellar reflex - Ankle jerk reflex - Plantar reflex
Primitive reflexes	Galant - Grasp - Moro - Rooting - Stepping - Sucking - Tonic neck
Other	Baroreflex - Acoustic reflex - H-reflex - Oculocardiac reflex - Stretch reflex - Startle reaction - Optokinetic - Withdrawal reflex - Crossed extensor reflex