Majkowski G R, Jovag B W, Taylor B T, Taylor M S, Allison S C, Stetts D M, Clayton R L
United States Army-Baylor Graduate Program in Physical Therapy, San Antonio, Texas.
Spine (Phila Pa 1976). 1998 Oct 1;23(19):2104-9. doi: 10.1097/00007632-199810010-00013.
A repeated measures multivariate design to assess the effect of back belts on isometric lifting force and lumbar paraspinal muscle fatigue.
To determine the efficacy of lumbar back belts in minimizing a loss in isometric force production and fatigue of lumbar paraspinal muscles.
Increased prevalence of back belts in industry and lack of scientific evidence supporting them suggested additional research was needed. There has been no conclusive research to substantiate manufacturer claims that use of belts reduces fatigue of lumbar paraspinals.
Twenty-four subjects, 13 men and 11 women, were tested twice: once with and once without a belt. All subjects performed a dynamic lifting task at a rate of 10 lifts per minute for 20 minutes. Surface electromyograms from the lumbar paraspinals and isometric force measurements were recorded during a static maximal isometric lift at 0, 10, and 20 minutes. Load during the dynamic task was determined as 20% of initial maximum isometric force. Electromyographic data were used to detect changes in median power spectral frequencies. Muscular fatigue was indicated by a reduction in median power spectral frequency values or a decrease in isometric force-generating capacity.
Multivariate and univariate analyses suggest that there is no effect on lumbar paraspinal muscle fatigue or isometric lifting force production as a result of back belt use.
These findings do not support the use of back belts for the purpose of minimizing either lumbar paraspinal muscle fatigue or a loss in isometric lifting force production.
采用重复测量多变量设计，以评估背带对等长提升力和腰椎旁肌肉疲劳的影响。
确定腰背部护带在最小化等长力量产生损失和腰椎旁肌肉疲劳方面的功效。
工业中背带的使用日益普遍，但缺乏支持它们的科学证据，这表明需要进行更多研究。尚无确凿研究证实制造商关于使用背带可减轻腰椎旁肌肉疲劳的说法。
24名受试者，13名男性和11名女性，接受了两次测试：一次佩戴背带，一次不佩戴。所有受试者以每分钟10次的速度进行动态提升任务，持续20分钟。在0、10和20分钟时进行静态最大等长提升时，记录腰椎旁肌肉的表面肌电图和等长力量测量值。动态任务期间的负荷确定为初始最大等长力量的20%。肌电图数据用于检测中位功率谱频率的变化。肌肉疲劳通过中位功率谱频率值的降低或等长力量产生能力的下降来表示。
多变量和单变量分析表明，使用背带对腰椎旁肌肉疲劳或等长提升力产生没有影响。
这些发现不支持使用背带以最小化腰椎旁肌肉疲劳或等长提升力产生损失的目的。
