Nachemson A, Schultz A, Andersson G
Scand J Rehabil Med Suppl. 1983;9:139-49.
Intradiscal pressures, intra-gastric pressures and myoelectric trunk muscle activities were measured in four volunteers wearing five different orthoses of three principle types, and performing six tasks. A biomechanical model was used to estimate the load on the spine in the different tasks so as to compare those tasks reliably when done with and without the orthoses. The results indicate that wearing a brace can significantly unload the trunk in some situations, but has no effect in others. Lumbar spine compression was reduced by about one-third in the task involving trunk flexion. The disc pressure values with an orthosis were lower in about two-thirds of the exercises and higher in the remaining one-third. The back muscle activity was in some experiments reduced by one-third by the use of the brace, in others it increased by the same amount. None of the orthoses raised the intra-gastric pressure significantly. No one orthosis was found to be clearly superior in mechanical effectiveness in the tasks studied.
对四名志愿者进行了测量，他们佩戴三种主要类型的五种不同矫形器，并执行六项任务，测量了椎间盘压力、胃内压力和躯干肌肌电活动。使用生物力学模型估计不同任务中脊柱上的负荷，以便在佩戴和不佩戴矫形器的情况下可靠地比较这些任务。结果表明，在某些情况下佩戴支具可显著减轻躯干负荷，但在其他情况下则无效果。在涉及躯干屈曲的任务中，腰椎压缩减少了约三分之一。在约三分之二的运动中，佩戴矫形器时的椎间盘压力值较低，在其余三分之一的运动中则较高。在一些实验中，使用支具可使背部肌肉活动减少三分之一，在另一些实验中则增加相同的量。没有一种矫形器能显著提高胃内压力。在所研究的任务中，没有发现一种矫形器在机械有效性方面明显优于其他矫形器。
