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• W1999846570 abstract "Forward progression of the body during walking involves both displacement of the legs in a frontal plane and rotation of the trunk about a longitudinal axis. PURPOSE: To determine the range of motion and the relative timing of displacement in transverse planes for the shoulders, lumbar spine, and pelvis during treadmill walking at three constant velocities. METHODS: Three healthy young women (24.7 ± 1.5 yrs, 1.61 ± 0.04 m, 47.3 ± 5.5 kg) with no history of neurological or musculoskeletal disorders participated in the study. The participants were asked to walk on a treadmill (L7, LANDICE, USA) at three constant velocities (A = 0.9 m/s, B = 1.2 m/s, C = 1.5 m/s). All participants performed 2-minute walk at each velocity with a 1-minute rest in between trials. All trials were captured by an eight-camera motion capture system (MAC3D, Motion Analysis Corporation, USA), operated at 200 Hz. Ten reflective markers were placed on the bony landmarks of the shoulder, lumbar spine, and pelvis. RESULTS: Stride length increased significantly (A = 1.17 ± 0.03 m; B = 1.30 ± 0.07 m; C = 1.45 ± 0.11 m, p<0.05) with walking velocity. At initial contact of the right foot, the right side of the pelvis rotated forward to facilitate the placement of the foot. The angular displacement of the pelvis increased significantly with walking speed (A = 12.1 ± 3.6 deg; B = 15.6 ± 2.4 deg; C = 19.8 ± 4.0 deg, p<0.05), and the timing of the peak forward rotation occurred earlier relative to foot contact as speed increased. The shoulder displacement was 180° out of phase with that of the pelvis. Shoulder displacement, however, did not change significantly with walking speed (A = 10.5 ± 2.6 deg; B = 7.7 ± 1.6 deg; C = 10.1 ± 2.7 deg). Similarly, the angular displacement of the lumbar spine did not change significantly with walking speed (A = 8.5 ± 2.1 deg, B = 7.3 ± 2.1 deg, C = 9.2 ± 3.0 deg), and the intermediate position (0 deg) occurred when both the pelvis and shoulder were at maximum angles. CONCLUSION: The results indicate that only the rotation of the pelvis and not that of the shoulders or lumbar spine changed across walking speed." @default.
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• W1999846570 date "2009-05-01" @default.
• W1999846570 modified "2023-09-23" @default.
• W1999846570 title "Axial Rotation Of Lumbar Spine During Treadmill Walking At Three Constant Velocities" @default.
• W1999846570 doi "https://doi.org/10.1249/01.mss.0000356107.04296.68" @default.
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