title: The effects of co-ordinating postures with shoulder and elbow flexion angles on maximum grip strength and upper-limb muscle activity in standing and sitting postures.
abstract: Eighteen co-ordination postures with shoulder flexion angles (0°, 45° and 90°) and elbow flexion angles (0°, 45° and 90°) in standing and sitting positions were evaluated to identify the effects of co-ordination postures on maximum grip strength and muscle activities of the upper limb in this study. Thirty-nine subjects were recruited and their maximum grip strengths were measured. According to the analysis of grip strength, grip strength was shown to be stronger in a standing posture (297.4 N) than in a sitting posture (274.6 N). In addition, grip strength (293.8 N) at 90° shoulder flexion angle was significantly higher than that at 0° and 45° shoulder angles. There was no statistically significant difference in grip strength from the effects of elbow angles in this study. The results of muscle activities for all muscle groups showed a similar trend with the results of grip strength associated with shoulder angles.
authors.affiliation: Department of Industrial Engineering, Sungkyunkwan University, Suwon, Korea. ykong@skku.edu.
authors.forename: Yong-Ku
authors.initials: YK
authors.lastname: Kong
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D004550:Elbow / Q000502:physiology; D004576:Electromyography; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D011187:Posture / Q000502:physiology; D016059:Range of Motion, Articular; D012782:Shoulder / Q000502:physiology; D034941:Upper Extremity / Q000502:physiology*