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The thumb during the crimp grip.

F Quaine¹, L Vigouroux, F Paclet

¹Université Joseph Fourier, Isere, Grenoble, France. franck.quaine@gipsa-lab.grenoble-inp.fr

International Journal of Sports Medicine

|November 19, 2010

Summary

Rock climbers use their thumb on the index fingernail to increase grip force. This study found thumb addition reorganizes finger force sharing, enhancing overall resultant force on holds without increasing injury risk for other fingers.

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Area of Science:

Biomechanics
Human Physiology
Sports Science

Background:

Rock climbing involves high forces exerted by fingers on varied holds.
The thumb can be positioned on the index fingernail to act as an additional force actuator.
Understanding thumb's role in finger force exertion is crucial for climbing performance and injury prevention.

Purpose of the Study:

To analyze how finger forces are modified by the thumb's supplementary action during climbing grip.
To investigate the impact of thumb-assisted grip on resultant force and finger force sharing.
To assess potential changes in pathology risks for fingers when the thumb is actively engaged.

Main Methods:

Experimental analysis of finger forces during simulated rock climbing grips.
Measurement of resultant forces exerted on holds with and without thumb assistance.
Evaluation of finger force distribution and potential risk factors for injury.

Main Results:

The addition of the thumb significantly increases the total resultant force exerted on the climbing hold.
Finger force sharing is substantially reorganized when the thumb provides supplementary force.
Pathology risks for the middle, ring, and little fingers were not found to be modified by thumb engagement.

Conclusions:

The central nervous system actively organizes the coordinated action of all five fingers, including the thumb, during complex grips.
Thumb assistance enhances overall grip force without compromising the safety of other digits.
Findings support theories of 'virtual fingers' and the 'neutral line of the hand' in motor control.