TY - JOUR T1 - A radiographic investigation of cervical spine kinematics when reading a tablet in a reclined trunk position. AU - Douglas,Ethan C, AU - Gallagher,Kaitlin M, Y1 - 2018/03/20/ PY - 2017/08/22/received PY - 2018/02/13/revised PY - 2018/02/20/accepted PY - 2018/6/6/entrez PY - 2018/6/6/pubmed PY - 2018/10/31/medline KW - Biomechanics KW - Mobile computing KW - Neck KW - Sitting KW - Tablet SP - 104 EP - 109 JF - Applied ergonomics JO - Appl Ergon VL - 70 N2 - The purpose of this study was to use radiographic measurements to compare cervical spine kinematics in various tablet computer reading postures. Radiographs were taken of twenty-two participants reading a tablet computer in five different postures. The lower cervical spine was more flexed in the semi-reclined (-8.2 ± 3.8°) and the reclined (-14.9 ± 4.0°) tablet positions compared to an upright (-4.43 ± 4.8°) tablet posture. Of the tablet reading positions, the reclined position had the lowest gravitational moment arm (5.2 ± 2.3 cm) and a skull angle closest to neutral (-9.4 ± 11.4°), while exhibiting the largest extension in the C1-C2 joint (34.4 ± 9.1°). Altering trunk position when reading a tablet could reduce the load required to support the head, but could put the head in a more forward head posture, stretch the cervical extensor muscles, and potentially result in pain. SN - 1872-9126 UR - https://www.unboundmedicine.com/medline/citation/29866298/A_radiographic_investigation_of_cervical_spine_kinematics_when_reading_a_tablet_in_a_reclined_trunk_position_ DB - PRIME DP - Unbound Medicine ER -