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Large Index-fingertip Forces Are Produced by Subject-independent Patterns of Muscle Excitation by Francisco J Valero-Cuevas; Felix E Zajac; Charles G Burgar is a Medicine article available to read on EtoBox.

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Are fingertip forces produced by subject-independent patterns of muscle excitation? If so, understanding the mechanical basis underlying these muscle coordination strategies would greatly assist surgeons in evaluating options for restoring grasping. With the finger in neutral ad-abduction and flexed 45°at the MCP and PIP, and 10°at DIP joints, eight subjects attempted to produce maximal voluntary forces in four orthogonal directions perpendicular to the distal phalanx (palmar, dorsal, lateral and medial) and in one direction collinear with it (distal). Forces were directed within 4.7$2.2°(mean$S.D.) of target and their magnitudes clustered into three distinct levels ( p(0.05; post hoc pairwise RMANOVA). Palmar (27.9$4.1 N), distal (24.3$8.3 N) and medial (22.9$7.8 N) forces were highest, lateral (14.7$4.8 N) was intermediate, and dorsal (7.5$1.5 N) was lowest. Normalized fine-wire EMGs from all seven muscles revealed distinct muscle excitation groups for palmar, dorsal and distal forces ( p(0.05; post hoc pairwise RMANOVA). Palmar force used flexors, extensors and dorsal interosseous; dorsal force used all muscles; distal force used all muscles except for extensors; medial and late

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Author

Francisco J Valero-Cuevas; Felix E Zajac; Charles G Burgar

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0021-9290)

Published

1998

Language

EN

Field

Medicine (Health Sciences)