title: Investigating the effects of movement speed on the lumbopelvic coordination during trunk flexion.
abstract: Movement speed during trunk flexion has long been reported to affect task performance and biomechanical responses. The current study investigated how movement speed changed lumbopelvic coordination, especially lumbopelvic continuous relative phase and phase variability during trunk flexion. Eighteen subjects executed a paced trunk flexion routine over time periods of 3, 7, 11 and 15seconds. The results demonstrated that compared with the 3-s condition, lumbopelvic continuous relative phase was 98.8% greater in the 15-s condition, indicating a more anti-phase coordination pattern. This pattern is suggested to mitigate the increased spinal loading associated with the longer duration of muscle exertion. Additionally, phase variability was 18.8% greater in the 15-s trials than the 3-s trials, such an unstable coordination pattern is likely caused by the more active neuromuscular control. Findings of this study provide important information about the effects of movement speed on lumbopelvic coordination during trunk flexion.
authors.affiliation: Department of Biological and Agricultural Engineering, University of California, Davis, Davis, CA 95616, USA. Electronic address: jiezhou@ucdavis.edu.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Department of Industrial and Management Systems Engineering, West Virginia University, Morgantown, WV 26506, USA. Electronic address: xiaopeng.ning@mail.wvu.edu.
authors.forename: Xiaopeng
authors.initials: X
authors.lastname: Ning
authors.affiliation: Department of Biological and Agricultural Engineering, University of California, Davis, Davis, CA 95616, USA. Electronic address: fathallah@ucdavis.edu.
authors.forename: Fadi
authors.initials: F
authors.lastname: Fathallah
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena / Q000502:physiology*; D006801:Humans; D008161:Lumbosacral Region / Q000294:innervation / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology; D010388:Pelvis / Q000294:innervation / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology; D016059:Range of Motion, Articular / Q000502:physiology; D060726:Torso / Q000294:innervation / Q000502:physiology*; D055815:Young Adult
keywords: Lumbopelvic coordination; Movement speed; Neuromuscular control; Spinal loading; Trunk flexion