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Quantification of the relationship between dynamic grip strength and forearm rotation: a preliminary study
P LaStayo1, L Chidgey, G Miller
1Department of Physical Therapy, University of Florida, Gainesville 32610, USA.
Annals of Plastic Surgery
|August 1, 1995
Summary
Dynamic grip strength testing reveals fatigue decreases grip strength over time. Grip strength also declines at supination angles beyond 70 degrees, unlike static measurements.
Area of Science:
- Biomechanics
- Human Movement Science
- Kinesiology
Background:
- Clinical grip strength (GS) measurement is typically static.
- Functional activities often involve dynamic wrist-forearm motion during gripping.
- Existing research lacks understanding of dynamic GS during forearm rotation.
Purpose of the Study:
- To investigate dynamic forearm rotation with isometric grip strength in real-time.
- To analyze the effects of fatigue and forearm rotation on grip strength.
- To compare dynamic GS measurements with existing static GS literature.
Main Methods:
- Thirty wrists from 15 healthy subjects were assessed.
- A tilt sensor attached to a strain gauge dynamometer was utilized.
- Subjects performed randomized maximal grip trials during 10-second forearm rotations.
Main Results:
- A significant decrease in grip strength was observed due to fatigue over time.
- Grip strength decreased significantly at supination angles greater than 70 degrees.
- No significant decrease in grip strength was found at pronation or supination angles below 70 degrees.
Conclusions:
- Dynamic grip strength testing reveals fatigue-induced strength loss.
- Supination beyond 70 degrees significantly reduces grip strength.
- Dynamic and static grip strength measurements may differ concerning forearm rotation.