title: Selective effects of arm proximal and distal muscles fatigue on force coordination in manipulation tasks.
abstract: Effects of muscle fatigue on force coordination and task performance of various manipulation tasks are explored. Grip force (GF; normal force component acting at the digits-object contact area) and load force (LF; tangential component that lifts and holds objects) were recorded prior to and after fatiguing the distal (DAM; i.e., GF producing) and proximal arm muscles (PAM; LF producing). Results reveal a deterioration of GF scaling (i.e., averaged GF-LF ratio), GF-LF coupling (their correlation), and task performance (ability to exert a prescribed LF pattern) associated with DAM, but not PAM fatigue. Deteriorated force coordination clearly increases the likelihood of dropping an object; however, the observed selective effects of DAM and PAM fatigue represent a novel finding deserving of further research.
authors.affiliation: a Department of Kinesiology and Applied Physiology , University of Delaware , Newark.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Emge
authors.forename: Mehmet
authors.initials: M
authors.lastname: Uygur
authors.forename: Mandic
authors.initials: M
authors.lastname: Radivoj
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Kaminski
authors.forename: Todd
authors.initials: T
authors.lastname: Royer
authors.forename: Slobodan
authors.initials: S
authors.lastname: Jaric
mesh_terms: D000328:Adult; D001132:Arm / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D055815:Young Adult
keywords: grip; hand; load; performance