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Digit cooling influences grasp efficiency during manipulative tasks.

D A Nowak1, J Hermsdörfer

  • 1Abteilung für Neurologie und Klinische Neurophysiologie, Städtisches Krankenhaus Bogenhausen, Akademisches Lehrkrankenhaus der Technischen Universität, Englschalkingerstrasse 77, 81925 Munich, Germany. dr.dennis.nowak@gmx.de

European Journal of Applied Physiology
|April 1, 2003
PubMed
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Cold-induced finger numbness impairs grip force scaling, leading to less economical force application during object manipulation. Reduced sensory feedback from cooled digits affects grip force adjustment.

Area of Science:

  • Neuroscience
  • Human Motor Control
  • Sensory Physiology

Background:

  • Tactile sensibility in grasping digits is crucial for grip force regulation.
  • Cold exposure commonly causes finger numbness and reduced sensation.

Purpose of the Study:

  • To investigate the effect of digit cooling on grip force scaling during dynamic object manipulation.
  • To determine if reduced tactile feedback impacts grip force adjustment in response to changing loads.

Main Methods:

  • Participants performed vertical arm movements while grasping an instrumented object.
  • Grip and load forces were measured before and after digit cooling.
  • Analysis focused on grip force adjustments relative to load force fluctuations.

Related Experiment Videos

Main Results:

  • Digit cooling did not affect the predictive temporal adjustment of grip force to movement-induced load changes.
  • Subjects applied significantly higher grip forces after digit cooling.
  • The ratio of grip to load force increased by 10-70% at movement turning points.

Conclusions:

  • Reduced sensory feedback from cooled digits impairs economical scaling of grip force.
  • Cutaneous afferent input is less critical for predictive grip force timing but essential for adaptive force level adjustment.
  • Findings highlight the role of sensory feedback in optimizing grip force during dynamic tasks.