caa a22 4500 477104487 CHVBK 20180405111550.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF02110752 doi (NATIONALLICENCE)springer-10.1007/BF02110752 The effect of head position on scapular orientation and muscle activity during shoulder elevation [Elektronische Daten] [Paula Ludewig, Thomas Cook] The purposes of this study were to compare the effects of flexed head positions on scapular orientation and muscle activity during humeral elevation, and to determine any association of kinematic and electromyographic (EMG) responses. Twenty-five subjects, 19-37 years old and without any recent history of shoulder or neck symptoms, were evaluated. Three-dimensional scapular coordinate data and surface EMG signals from the trapezius (upper and lower), levator scapulae, and serratus anterior were collected at static positions (0°, 90°, and 140°) of humeral elevation in the scapular plane and head positions (0°, 25°, and 50°) of sagittal plane flexion. Scapular upward rotation and tipping were significantly decreased in flexed head positions. The effect of head position on scapular tipping increased as humeral elevation increased. Mean EMG activity of the levator scapula, upper trapezius, and serratus anterior was unchanged across head positions. The lower trapezius demonstrated small but statistically significant increases in mean activity at the 0° and 140° arm positions when the head was flexed to 50°. Significant correlations were found between some EMG and kinematic responses in flexed head positions, however, no consistent patterns were apparent across muscles or positions. Plenum Publishing Corporation, 1996 head position nationallicence shoulder joint nationallicence scapula nationallicence electromyography nationallicence Ludewig Paula Physical Therapy Graduate Program, The University of Iowa, 2600 Steindler Building, 52242, Iowa City, Iowa aut Cook Thomas Department of Preventive Medicine and Physical Therapy Graduate Program, The University of Iowa, Iowa City, Iowa aut Journal of Occupational Rehabilitation Kluwer Academic Publishers-Plenum Publishers 6/3(1996-09-01), 147-158 1053-0487 6:3<147 1996 6 10926 https://doi.org/10.1007/BF02110752 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02110752 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ludewig Paula Physical Therapy Graduate Program, The University of Iowa, 2600 Steindler Building, 52242, Iowa City, Iowa aut NATIONALLICENCE 700 1- Cook Thomas Department of Preventive Medicine and Physical Therapy Graduate Program, The University of Iowa, Iowa City, Iowa aut NATIONALLICENCE 773 0- Journal of Occupational Rehabilitation Kluwer Academic Publishers-Plenum Publishers 6/3(1996-09-01), 147-158 1053-0487 6:3<147 1996 6 10926 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer