Evaluation of Relationship between Extensor Digitorum Communis Hoffmann-reflex Latency and Upper Limb Length and Age

Area of Science:

• Neurophysiology
• Clinical Electrophysiology
• Biometrics

Background:

• The extensor digitorum communis (EDC) Hoffmann-reflex (H-reflex) is a key electrophysiological measure.
• Understanding normal H-reflex latency values is crucial for diagnosing neurological conditions.
• Factors influencing H-reflex latency, such as limb length and age, require elucidation.

Purpose of the Study:

• To investigate the relationship between normal extensor digitorum communis (EDC) Hoffmann-reflex (H-reflex) latency and upper limb length.
• To determine the correlation between EDC H-reflex latency, age, and sex in healthy individuals.
• To establish regression equations for predicting normal EDC H-reflex latency.

Main Methods:

• A cross-sectional study involving 120 upper limbs from 76 healthy volunteers.
• Standard electrodiagnostic techniques were employed to measure the onset latency of the EDC H-reflex.
• Data analysis included correlation and regression to assess relationships between latency, limb length, age, and sex.

Main Results:

• The mean EDC H-reflex latency was 15.89 ± 1.41 ms.
• A significant positive correlation was observed between EDC H-reflex latency and both upper limb length (r=0.749) and arm length (r=0.758).
• Age and sex showed no statistically significant correlation with EDC H-reflex latency.

Conclusions:

• Upper limb length and arm length demonstrate good predictive value for estimating normal EDC H-reflex latency.
• These findings provide valuable reference data for clinical electrodiagnostic assessments.
• The study highlights the importance of anthropometric measurements in interpreting H-reflex latency.