Objectives: This study examines if modelling the cephalocaudal regions into four separate regions reveals different kinematic patterns of spinal motion in relation to hip motion when lifting an object (a 5 kg dumbbell) from the ground to an upright position. Methods: Thirty-two male participants (mean age=28.2 ± 4.2 years; weight=74.4 ± 11 kg; height=1.70 ± 0.04 meters) agreed to participate in this study. The cephalocaudal region of the spine was divided into four distinct regions of the spine (Head-Cervical, Thoracic, Upper-Lumbar and Lower-Lumbar) to obtain their range of motions and velocities against the hip region during a sagittal object-lifting task. A six tri-axial accelerometer sensors system was placed on six different points: the forehead; the spinous process of Thoracic-1; spinous process of Thoracic 3; spinous process of Thoracic-12; Sacral 1; and the middle aspect of the thigh. Results: There were significant differences in the range of motions between each of the five anatomical regions (p<0.001) during an object-lifting task. Additionally, there were significant differences with regard to positive and negative velocity between upper lumbar vs hip or upper lumbar vs lower lumbar or thoracic vs hip or head-cervical vs hip or head-cervical vs upper lumbar or head-cervical vs hip or lower lumbar vs hip. The hip region produced the most kinematic motion and velocity followed by the Lower-Lumbar and Upper-Lumbar during the functional lifting task. There were significant correlations found between Head-Cervical and lower-lumbar, head-cervical and hip, Thoracic and upper-lumbar, thoracic and hip, upper-lumbar and lower-lumbar, and lower-lumbar and hip during both range of motion and velocity analysis. Conclusion: The results of this study demonstrate differences in the contribution of five anatomical regions during a functional lifting task. Hip and lower-lumbar and upper-lumbar made up the most significant proportion of total kinematic motions and velocity during the functional lifting task.
Raee Saeed Alqhtani*