Segmental nerve conduction velocity in vibration-exposed shipyard workers.

Area of Science:

• Occupational health
• Neurophysiology
• Biomedical engineering

Background:

• Industrial use of vibratory tools can lead to peripheral nerve damage.
• Assessing nerve conduction velocity (NCV) is crucial for diagnosing and understanding nerve injuries.
• Segmental NCV measurements offer a more detailed assessment than standard wrist-digit tests.

Purpose of the Study:

• To measure segmental sensory nerve conduction velocity (SNCV) in vibration-exposed shipyard workers.
• To determine if SNCV is selectively slowed in the fingers.
• To evaluate the feasibility of adapting laboratory NCV methods for field use.

Main Methods:

• Segmental SNCV was measured from wrist to hand and digits in shipyard workers using vibratory tools.
• Stimulation at the wrist with distal recording electrodes adjusted to individual anatomy.
• Three segments were analyzed: wrist-palm, palm-proximal digit, and digital segments.

Main Results:

• SNCV was slower in wrist-palm and digital segments compared to palm-proximal digit segments for both median and ulnar nerves.
• In dominant-hand median nerves of exposed workers, wrist-palm SNCV was 41.4 m/s and digital SNCV was 42.1 m/s.
• Skin temperature significantly affected SNCV, with varying impacts across different nerve segments.

Conclusions:

• Reduced digital SNCV may result from occupational exposure to industrial vibration.
• Each sensory nerve segment exhibits distinct velocity characteristics and temperature associations.
• Differences in median and ulnar nerve segments have implications for standard wrist-digit velocity assessments.