The functional significance of changes in the H-reflex
response to functional ambulation in humans has not been demonstrated [43,103-105].
Douglas Watt of McGill University, H-Reflex
found that reflex activation of the calf muscles (spinal cord excitability) decreased by about 35% in weightlessness, which could result in exercise in space being less effective, posing a problem that will need to be studied further for future long-duration missions.
Latency of the soleus H-reflex
was normal, and reciprocal suppression by dorsal flexion of the foot remained.
is used to study the effects of vibration on MN pool excitability (5-7).
It is well documented that any changes in H-reflex
amplitude, latency and recovery time reflect the changes in spinal motor neuron excitability [8,11,12].
Sensory Motor Action Potential, F-wave, H-reflex
2010) also show significant increase in peak torque but not H-reflex
and suggest the changes might be related to myosin light chain phosphorylation as the possible mechanism that facilitates the increase in force production.
EMG may detect myopathic and neuropathic changes including a delay in the H-reflex
with the affected leg in a flexed, adducted, and internally rotated (FAIR) position as compared with the same H-reflex
in the normal anatomic position.
Effects of therapeutic passive exercise of hip and knee joints on the soleus H-reflex
Action potentials in alpha motor neurons activate the muscle and excitation of the muscle can be detected in the form of an H-reflex
wave on the EMG tracing.
Effects of changes in hip joint angle on H-reflex
excitability in humans.
was first described by Paul Hoffmann in 1910, (10) and has been used extensively as a technique for studying sensorimotor integration and spinal cord adaptations accompanying acquisition and maintenance of motor skills.