Contributions and co-ordination of individual fingers in multiple finger prehension

Article Abstract:

An examination of the mechanics of external finger grip forces while lifting with a precision grip using multiple fingers revealed that fluctuation of object weight or surface friction causes a change in grip force magnitude. The change in the finger force was largest for the index finger, followed in descending order by the middle, ring and little fingers. Higher surface friction correlated with lower grip pressure, suggesting that some finger stress can be relieved through the use of non-slippery surfaces.

Health aspects, Grip strength, Handles

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A single metric for quantifying biomechanical stress in repetitive motions and exertions

Article Abstract:

The effects of repetitive motion and force were quantified and modeled to investigate how biochemical measurements of posture, force and repetition can be combined into a metric corresponding to subjective discomfort. Seven subjects were used to conduct the full factorial experiment involving a repetitive wrist flexion from a neutral posture to a given angle against a controlled force. The model created was found to be useful for measurement of biochemical stress.

Stress (Physiology), Motion

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External finger forces in submaximal five-finger static pinch prehension

Article Abstract:

A study to determine the contribution of individual fingers to total submaximal pinch prehension was conducted. Thin pressure sensors connected to a microcomputer were used to measure each finger. Results indicated that the index and middle fingers exerted the greatest force. Individual force contributions, however, were not constant as the load increased. Index finger force actually decreased with an increase in weight.

Joints, Physiological aspects, Hand, Range of motion

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