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H-reflex and F-wave potentials in leg and arm muscles
A Jusić1, R Baraba, A Bogunović
1Department of Neurology, University of Zagreb, Croatia.
Electromyography and Clinical Neurophysiology
|December 1, 1995
Summary
This study analyzed H-reflex and F-wave potentials in healthy volunteers, finding their presence varies significantly by muscle group. Tonic muscles, like thigh and finger flexors, showed higher H-reflex and F-wave frequencies, suggesting a link to muscle function and possibly evolutionary traits.
Area of Science:
- Neurophysiology
- Motor Control
- Human Physiology
Background:
- Secondary muscle potentials, including H-reflex and F-wave, provide insights into motor neuron excitability and muscle function.
- Previous research has indicated variability in the occurrence of these potentials across different muscle groups.
Purpose of the Study:
- To systematically analyze the distribution and incidence of H-reflex and F-wave potentials in a wide range of healthy human muscles.
- To investigate potential correlations between the presence of these potentials and the functional role (tonic vs. phasic) of the muscles.
Main Methods:
- Multicentric study involving systematic electrophysiological examinations of H-reflex and F-wave potentials.
- Analysis was conducted on 9 muscles in the legs and 9 in the lower arms and hands of healthy volunteers.
- 'F-frequency' was used to evaluate F-wave occurrence and distribution patterns.
Main Results:
- H-reflex potentials were consistently found in thigh muscles (e.g., vastus medialis 100%) and posterior lower leg muscles (e.g., soleus 93%), but absent in anterior tibial and extensor digitorum brevis muscles.
- Similar distribution patterns were observed in arm and hand muscles, with flexor muscles showing higher incidence than extensors.
- F-wave frequency mirrored H-reflex distribution, being lower in extensors and higher in flexors and thigh muscles. Individual variability in H-reflex/F-wave presence was noted.
Conclusions:
- The incidence of H-reflex and F-wave potentials is muscle-specific, with tonic muscles (e.g., postural, grip) exhibiting higher frequencies.
- This distribution may reflect phylogenetic remnants and differential development in motor control, particularly in less differentiated muscle groups.
- Further research is warranted to explore potential differences in motor unit structure and motoneuron properties between H-reflex and F-wave positive muscles.