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Memory for fingertip forces: passive hand muscle vibration interferes with predictive grip force scaling
Dennis A Nowak1, Karin Rosenkranz, Joachim Hermsdörfer
1Sobell Department of Motor Neuroscience and Movements Disorders, Institute of Neurology, University College London, UK. Dr.Dennis.Nowak@gmx.de
Experimental Brain Research
|January 15, 2004
Summary
Passive muscle vibration disrupts the brain's ability to predict grip force for lifting tasks. This suggests vibration interferes with motor memory, impacting how we prepare for future movements.
Area of Science:
- Neuroscience
- Motor Control
- Human Movement Science
Background:
- Repetitive lifting tasks show grip force is influenced by preceding lift properties.
- This grip force scaling effect occurs regardless of whether the subsequent lift uses the same or opposite hand.
Purpose of the Study:
- To investigate the effect of passive muscle vibration on predictive grip force scaling.
- To determine if vibration interferes with the memory processes underlying grip force adaptation.
Main Methods:
- Subjects performed repetitive object lifting trials.
- Passive vibration was applied to hand muscles (first interosseus, adductor pollicis) during a rest period between trials.
- Grip force parameters (peak force, rate of force increase) were measured.
Main Results:
- Muscle vibration significantly increased grip force and its rate of increase in subsequent lifts compared to pre-vibration lifts.
- This disruption occurred for lifts made with both the dominant and non-dominant hands.
- Grip force scaling accuracy was restored within three lifts post-vibration.
- A control group with rest but no vibration showed no significant change in grip force scaling.
Conclusions:
- Passive muscle vibration impairs predictive grip force scaling.
- The findings support the role of memory processes in grip force adaptation.
- These memory processes appear to be non-specific to the exact motor action or object properties.