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Related Experiment Video

Updated: Sep 11, 2025

Screening of Axonal Degeneration in Carpal Tunnel Syndrome Using Ultrasonography and Nerve Conduction Studies

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Method for Assessing Numbness and Discomfort in Cyclists' Hands.

Flavia Marrone¹, Nicole Sanna¹, Giacomo Zanoni¹

¹Department of Mechanical Engineering, Politecnico di Milano, 20156 Milano, Italy.

Sensors (Basel, Switzerland)

|August 14, 2025

Summary

Cyclists experience hand numbness from road vibrations. A new lab method effectively measures this using vibrotactile perception threshold (VPT) and discomfort scores, differentiating handlebar designs.

Keywords:

cycling cyclist palsy discomfort hand-transmitted vibration (HTV)handlebar numbness temporary threshold shift (TTS)vibrotactile perception threshold (VPT)

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Last Updated: Sep 11, 2025

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Design, Fabrication, and Administration of the Hand Active Sensation Test HASTe

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Area of Science:

Biomechanics
Human Factors Engineering
Sports Science

Background:

Road irregularities transmit vibrations to cyclists' hands, causing discomfort and numbness.
Assessing these effects objectively is crucial for improving cyclist comfort and safety.

Purpose of the Study:

To develop and validate a laboratory method for assessing vibration-induced hand numbness and discomfort in cyclists.
To evaluate the sensitivity of the vibrotactile perception threshold (VPT) and subjective discomfort scores.

Main Methods:

A laboratory setup simulating road-bike interaction using a smart trainer and vibrating platform.
Measurement of vibrotactile perception threshold (VPT) in fingers and subjective discomfort via questionnaire.
Testing with ten male volunteers across two handlebar designs during one-hour cycling sessions.

Main Results:

The proposed method successfully identified vibration-induced perception shifts and differences between fingers.
VPT measurements proved sensitive to vibration exposure and handlebar design variations.
Discomfort scores exhibited significant inter-subject variability, highlighting the need for combined objective and subjective measures.

Conclusions:

The developed laboratory method is effective for assessing hand numbness and discomfort in cyclists.
Combining objective VPT measurements with subjective discomfort ratings provides a comprehensive evaluation.
This approach can aid in the design of handlebars that minimize vibration transmission and enhance rider comfort.