کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4065499 1266254 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of lumbar extensor fatigue on paraspinal muscle reflexes
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی ارتوپدی، پزشکی ورزشی و توانبخشی
پیش نمایش صفحه اول مقاله
Effect of lumbar extensor fatigue on paraspinal muscle reflexes
چکیده انگلیسی

Low back disorders are a frequent medical problem. Altered neuromuscular control of the spine has been associated with low back pain, and may contribute to its occurrence. The purpose of this study was to investigate the effect of lumbar extensor fatigue on reflex delay and amplitude in the paraspinal muscles. Ten healthy males (20–22 years of age) were subjected to an anteriorly-directed perturbation applied at the inferior margin of the scapulae while standing quietly before and after a lumbar extensor fatiguing protocol. The fatiguing protocol consisted of multiple sets of back extensions and intermittent isometric maximum voluntary contraction on a Roman chair for 14 min until 60% of unfatigued lumbar extensor MVC was reached. Reflexes were recorded from the paraspinal muscles at the level of L4. Results indicated the mean reflex delay was 60 ± 18 ms and was not affected by fatigue (p = 0.278). Reflex amplitude increased 36 ± 32% with fatigue (p = 0.017). The increase in reflex amplitude may reflect an attempt to compensate for losses in muscle force capacity with fatigue in order to maintain sufficient spinal stability. However, additional studies are necessary to investigate the mechanisms of this fatigue-related change in paraspinal reflex.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electromyography and Kinesiology - Volume 16, Issue 6, December 2006, Pages 637–641
نویسندگان
, , , ,