Temperature effects on vibrotactile sensitivity threshold measurements: implications for carpal tunnel screening...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Human Physiology

Background:

• Vibrotactile sensitivity is a key indicator for assessing peripheral nerve function.
• Carpal tunnel syndrome (CTS) screening often relies on sensory tests, but environmental factors can influence results.
• Understanding the impact of physiological variables like skin temperature is essential for accurate diagnostic testing.

Purpose of the Study:

• To investigate the relationship between fingertip skin temperature and vibrotactile sensitivity thresholds.
• To determine the implications of temperature-dependent sensitivity changes on carpal tunnel syndrome screening.
• To establish optimal temperature guidelines for reliable vibrotactile measurements.

Main Methods:

• Twenty subjects (11 male, 9 female) participated in the study.
• Fingertip vibrotactile thresholds were measured using the method of limits across four frequencies (31.5, 125, 250, 500 Hz).
• Measurements were conducted across six distinct skin temperature ranges, from 17°C to 35°C.

Main Results:

• Vibrotactile sensitivity thresholds increased as fingertip skin temperature decreased.
• This temperature effect was frequency-dependent, with higher frequencies showing greater sensitivity to temperature changes.
• Significant temperature effects on sensitivity were observed at temperatures below 29°C.

Conclusions:

• Decreased fingertip skin temperature elevates vibrotactile thresholds, potentially leading to false positives in carpal tunnel syndrome screening.
• Accurate neuropathy screening requires monitoring and maintaining fingertip skin temperature, ideally above 29°C.
• Recording skin temperature prior to vibrotactile measurements is recommended to mitigate misclassification errors.