On this Page: 1  The significance of Mercury Retrograde. 2  Indicators in the charts of people especially sensitive to the Mercury Retrograde cycle. 3  How this Mercury Retrograde cycle affects each sign of the zodiac.
The H-reflex (or Hoffmann's 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).fter about 5 days in zero gravity, for instance in orbit around Earth, the h-reflex diminishes significantly. It is generally assumed that this is due to a marked reduction in the excitability of the spinal cord in zero gravity.
The H-reflex on stimulation of the tibial nerve in the popliteal fossa is routinely used in the diagnosis of first sacral (S1) nerve-root radiculopathy.The H-reflex latency, however, is considered to lack sensitivity since a small change from the focal root pathology can be diluted in a relatively long reflex latency.n 1918, Hoffmann originally described the H-reflex occurring in calf muscles of humans on stimulation of the tibial nerve in the popliteal fossa. Hugon described a standardised technique for soleus H-reflex testing (Hugon, 1973).