Analysis of the lumbar and pelvic rhythm during trunk flexion-extension in two load lifting conditions simulated in healthy policemen.
DOI:
https://doi.org/10.11606/issn.2317-0190.v11i3a102492Keywords:
Biomechanics, Kinematics, Spine, Electromyography, Lumbosacral RegionAbstract
The purpose of this study was to correlate muscle activity with lumbar-pelvic rhythm kinematics during trunk flexion and extension under two different conditions, straight and flexed knees (squat). Subjects and methods: Thirty six young male policemen from Mounted Police Regiment from São Paulo were recruited, but only nineteen volunteers (22.9 ± 2.3 years old) with no back pain history and no vertebral deformities were selected for this study. Three-dimensional movement analysis was performed with retro-reflective markers at L1, L3, S1 spinous processes, anterior-superior iliac spine, great throcanter, knee lateral fulcrus and lateral malleolus bilaterally, while dynamic surface electromyography recording was done in the lumbar extensors, hamstrings, and recto abdominal and recto femoris. Results: During movement with straight knees, the activity of lumbar extensors were synchronized with the hamstrings and alternated with the rectos abdominal muscles. The abdominal muscles contraction for 15 subjects took place at the end of trunk flexion, whereas for the other four there was no activity recorded. The lumbar extensors activities were decreasing before the full flexion. Squatting reveals a substitution of the double bump activation pattern of the lumbar extensors by a continuous activation profile. Discussion: Inter-individuals and intra individual variations were observed and could to influence the examinations. Our results reflect the differences in lumbar-pelvic rhythm and muscular activation pattern between the two different conditions evaluated in all muscles studied. Conclusion: The lumbar-pelvic rhythm occurred in the two movements evaluated with an important participation of the hamstrings and paraspinal muscles.
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