H-reflex

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).

Additional recommended knowledge

Daily Visual Balance Check

Guide to balance cleaning: 8 simple steps

Essential Laboratory Skills Guide

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]

See also

• Motor reflex
• Tendon reflex
• Achilles reflex
• Pupillary reflex
• Tonic vibration reflex

References

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