Ciriello V M, Snook S H
Liberty Mutual Research Center for Safety and Health, Hopkinton, Massachusetts, USA.
Spine (Phila Pa 1976). 1995 Jun 1;20(11):1271-8; discussion 1278. doi: 10.1097/00007632-199506000-00013.
An experiment was conducted to investigate the effect of wearing a weight lifting belt on the endurance and fatigue characteristics of the extensor muscles of the spine.
To evaluate the effectiveness of back belts in preserving the endurance characteristics of the spinal musculature.
Previous studies have investigated the use of back belts in increasing intra-abdominal pressure and thus increasing the stabilization of the spine. Other studies have looked at the association of low back disability and wearing back belts. No study has examined the relationship between wearing back belts and measures of spinal muscle fatigue and endurance.
Thirteen male industrial workers performed a lifting and lowering task from the floor to a 76.2 cm height at 4.3 min-1 2 days a week for 4 weeks. The load was psychophysically determined and averaged 28.1 kg for a total of 28.9 metric tons moved in 4 hours. Subjects lifted for 1, 2, 3, and 4 hours, respectively, for the first 4 days of the experiment. These were considered training days. During the last 4 days, subjects lifted for 4 hours per day; 2 days with a back belt, and 2 days without a back belt. Maximum isokinetic endurance of the extensors was measured for 50 repetitions (5 sets of 10 repetitions) at the end of 4 hours of lifting. Median frequencies of the electromyographic signal from six locations over the back extensors were measured for 30 seconds at 80% of maximum isometric voluntary contraction after 4 hours of lifting.
There were no significant differences in maximum isokinetic endurance, or in the slope of median frequency, between lifting with a back belt and lifting without a back belt. Similarly, a modified Borg scale and a postexperiment survey question were unable to distinguish between wearing a back belt and not wearing a back belt.
There were no significant differences in maximum isokinetic endurance and electromyographic spectral parameters of the back extensor muscles as a result of wearing a back belt during heavy lifting and lowering tasks.
进行了一项实验，以研究佩戴举重腰带对脊柱伸肌耐力和疲劳特性的影响。
评估背部护带在保持脊柱肌肉组织耐力特性方面的有效性。
先前的研究调查了背部护带在增加腹内压从而增强脊柱稳定性方面的应用。其他研究则关注了下背部功能障碍与佩戴背部护带之间的关联。尚无研究探讨佩戴背部护带与脊柱肌肉疲劳和耐力指标之间的关系。
13名男性产业工人每周进行2天、为期4周的从地面举升至76.2厘米高度并放下的任务，速度为每分钟4.3次。负荷通过心理物理学方法确定，平均为28.1千克，4小时内总共搬运28.9公吨。在实验的前4天，受试者分别举升1、2、3和4小时。这些被视为训练日。在最后4天，受试者每天举升4小时；2天佩戴背部护带，2天不佩戴背部护带。在举升4小时结束时，测量伸肌的最大等速耐力，进行50次重复（5组，每组10次）。在举升4小时后，以最大等长随意收缩的80%进行30秒测量，记录背部伸肌六个位置肌电信号的中位频率。
佩戴背部护带举升和不佩戴背部护带举升在最大等速耐力或中位频率斜率方面没有显著差异。同样，改良的博格量表和实验后调查问题也无法区分佩戴背部护带和不佩戴背部护带的情况。
在繁重的举升和放下任务中，佩戴背部护带对背部伸肌的最大等速耐力和肌电图频谱参数没有显著差异。
