Neuromuscular disorders associated with static lumbar flexion: a feline model.
Solomonow-M; Zhou-BH; Baratta-RV; Zhu-M; Lu-Y
J Electromyogr Kinesiol 2002 Apr; 12(2):81-90
Static flexion of the lumbar spine with constant load applied to the viscoelastic structures for 20 minutes and for 50 minutes resulted in development of spasms and inhibition in the multifidus muscles (e.g., deep erector spinae) and in creep of the supraspinous ligament in the feline model. The development of spasms and inhibition was not dependent on load magnitude. It is suggested that occupational and sports activities which require prolonged static lumbar flexion within the physiological range can cause a "sprain"-like injury to the ligaments, which in turn reflexively induce spasms and inhibition in some erector spinae muscles. Such disorder may take a long time to recover, in the order of days to weeks, depending on the level of creep developed in the tissues.
Muscles; Muscular-disorders; In-vivo-study; Animal-studies; Animals; Laboratory-animals; Spinal-cord; Tension; Back-injuries; Spasms; Musculoskeletal-system; Musculoskeletal-system-disorders
Bioengineering Laboratory, Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans, Louisiana 70112, USA
Disease and Injury: Low Back Disorders
Journal of Electromyography and Kinesiology
Louisiana State University, Health Sciences Center, New Orleans, Louisiana