Comparing H-reflexes in Different Leg Muscles
Author Information
Author(s): Alrowayeh Hesham N, Sabbahi Mohamed A, Etnyre Bruce
Primary Institution: Kuwait University, Faculty of Allied Health Sciences, Physical Therapy Department
Hypothesis
The study aims to compare H-reflex recordings between the soleus, medial gastrocnemius, and lateral gastrocnemius muscles during varied body postures and ankle positions.
Conclusion
The study found that the H-reflex amplitudes and ratios varied significantly with body posture and ankle position, indicating different muscle activation patterns.
Supporting Evidence
- The H-reflex amplitudes were significantly lower during standing compared to lying.
- H-reflex amplitudes were greater during standing with the ankle in plantarflexion compared to neutral.
- H-reflex amplitudes were less with the ankle in dorsiflexion compared to neutral during lying and standing.
- The study provides a reference standard for comparison to patients with L5 and/or S1 nerve root impingements.
Takeaway
This study looked at how different leg muscles react when you change your position or move your foot, helping doctors understand muscle function better.
Methodology
H-reflexes were recorded from ten participants during prone lying and standing with the ankle in neutral, maximum dorsiflexion, and maximum plantarflexion positions using three-way ANOVAs for statistical comparisons.
Potential Biases
Potential cross talk in EMG recordings, although minimized by electrode placement.
Limitations
The study had a small sample size of 10 participants and did not monitor tibialis anterior muscle activity.
Participant Demographics
Ten healthy males, mean age 32.3 years.
Statistical Information
P-Value
p = .006, .009, .029 for standing vs. lying; p = .0005 for dorsiflexion vs. neutral.
Statistical Significance
p ≤ .05
Digital Object Identifier (DOI)
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