title: Nonlinear metrics assessing motor variability in a standardized pipetting task: Between- and within-subject variance components.
abstract: The aim of this study was to estimate the between days test-retest reliability of nonlinear metrics used to quantify motor variability in a repetitive pipetting task. On three separate days, 14 healthy subjects performed pipetting as a general model of repetitive tasks. The task consisted of transferring liquid 20 times with a cycle time of 2.8s from a pickup tube to eight target tubes placed on a table in front of the subjects. The motion of hand, arm and the pipette tip was tracked in 3D and the shoulder elevation and elbow flexion angle were obtained. Motor variability was assessed using nonlinear metrics based on information theory and recurrence quantification analysis. Between- and within- (between-days) subject variance components were computed using a one-way random effect model, and intra-class correlation coefficients (ICC) were calculated from the variance components as standardized measures of reliability. Most of the metrics displayed a considerable between-days variance component and therefore the ICC showed a slight to moderate reliability. The reported data on between- and within-subject variability can be used to design future studies using nonlinear motor variability metrics on kinematics data.
authors: Laboratory for Ergonomics and Work-Related Disorders, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7, D-3, 9220 Aalborg East, Denmark. Electronic address: afsamani@hst.aau.dk.
authors: Afshin
authors: A
authors: Samani
authors: Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, University of Gävle, SE-801 76 Gävle, Sweden.
authors: Divya
authors: D
authors: Srinivasan
authors: Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, University of Gävle, SE-801 76 Gävle, Sweden.
authors: Svend Erik
authors: SE
authors: Mathiassen
authors: Laboratory for Ergonomics and Work-Related Disorders, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7, D-3, 9220 Aalborg East, Denmark.
authors: Pascal
authors: P
authors: Madeleine
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena / Q000502:physiology; D005260:Female; D006225:Hand / Q000502:physiology*; D006801:Humans; D018482:Muscle, Skeletal / Q000502:physiology*; D017711:Nonlinear Dynamics; D016059:Range of Motion, Articular / Q000502:physiology; D015203:Reproducibility of Results; D012782:Shoulder / Q000502:physiology; D014937:Work / Q000502:physiology*; D055815:Young Adult
keywords: Entropy; Kinematics; Nonlinear dynamics; Recurrence quantification analysis; Structure of motor variability; Test–retest reliability