title: Endurance time, muscular activity and the hand/arm tremor for different exertion forces of holding.
abstract: This study aimed to examine the effects of exertion force on endurance time, muscular activity and hand/arm tremor during holding. Fifteen healthy young males were recruited as participants. The independent variable was exertion force (20%, 40%, 60% and 80% maximum holding capacity). The dependent variables were endurance time, muscular activity and hand/arm tremor. The results showed that endurance time decreased with exertion force while muscular activity and hand/arm tremor increased with exertion force. Hand/arm tremor increased with holding time. Endurance time of 40%, 60% and 80% maximum holding capacity was approximately 22.7%, 12.0% and 5.6% of that of 20% maximum holding capacity, respectively. The rms (root mean square) acceleration of hand/arm tremor of the final phase of holding was 2.27-, 1.33-, 1.20- and 1.73-fold of that of the initial phase of holding for 20%, 40%, 60% and 80% maximum holding capacity, respectively.
authors.affiliation: a Southern Taiwan University of Science and Technology , Taiwan.
authors.forename: Tzu-Hsien
authors.initials: TH
authors.lastname: Lee
mesh_terms: D001132:Arm / Q000502:physiology*; D006225:Hand / Q000502:physiology*; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology; D009140:Musculoskeletal Diseases / Q000503:physiopathology; D009784:Occupational Diseases / Q000503:physiopathology; D016272:Occupational Health; D010807:Physical Endurance / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D013997:Time Factors; D014202:Tremor / Q000503:physiopathology*; D055815:Young Adult
keywords: capability; musculoskeletal injury; steadiness; vibration