Related Experiment Videos
H reflex and F wave latencies to soleus normal values and side-to-side differences
J A Strakowski1, D D Redd, E W Johnson
1Grant-Riverside Methodist Hospitals, The Ohio State University, Columbus, USA.
American Journal of Physical Medicine & Rehabilitation
|June 26, 2001
Summary
F wave latencies in the soleus muscle show predictive value similar to H reflexes for evaluating S1 radiculopathy. This finding aids electromyographers in differentiating these nerve conduction study signals.
Area of Science:
- Neurology
- Neurophysiology
Background:
- Electromyography requires distinguishing H reflexes and F waves for soleus muscle analysis in S1 radiculopathy.
- H reflexes are valuable for S1 radiculopathy assessment, while F wave utility is debated.
Purpose of the Study:
- To investigate the relationship between tibial H reflex and F wave latencies.
- To assess the clinical predictive value of F wave latencies compared to H reflexes.
Main Methods:
- Recorded H reflex and F wave latencies from the soleus muscle in 40 healthy subjects.
- Stimulation was increased to supramaximal levels after H wave recording.
- Calculated predicted H wave latency using standard formulas.
Main Results:
- Average F wave latency was 1.76 ms longer than the ipsilateral H reflex latency.
- Mean side-to-side difference for F waves was 0.56 ms, and for H reflexes was 0.36 ms.
Conclusions:
- Average F wave latencies demonstrate predictive value comparable to H reflexes in a clinical setting.
- Findings support the use of F waves in evaluating S1 radiculopathy.