Faculty of Physical Therapy .
Physiother Theory Pract. 2014 Apr;30(3):218-22. doi: 10.3109/09593985.2013.845806. Epub 2013 Oct 22.
To quantify the force of elastic tubes at different elongation patterns used in exercises.
A tensile test of elastic tubes which had seven levels of resistance identified by colors was performed. All samples (n = 105; 15 samples for each color) were 7 cm of length and had two interfaces for fixation. The samples were tested in a tensile testing hydraulic machine, under elongation control, up to 200% of the original length (21 cm). The force values corresponding to an increase of 50%, 100%, 150% and 200% of the samples initial length were recorded.
A strong linear association between force and elongation for all colors was found. There were different forces for each elongation investigated for the same tube and between different tubes in almost all percentage of elongation investigated, except for the red and green tubes (all elongations), and for the blue and black tubes at 50% elongation.
Mechanical tests revealed different elastic forces for different levels of elongation of each tube. The replication of the results in clinical situations is recommended, so the elastic resistance in clinical routine could be evaluated with more propriety.
量化在运动中使用的不同拉伸模式下弹性管的力。
对七种颜色标识的阻力弹性管进行拉伸试验。所有样品（n=105；每种颜色 15 个样品）长度为 7cm，具有两个用于固定的接口。样品在拉伸测试液压机中以伸长率控制的方式进行测试，直到原始长度的 200%（21cm）。记录与样品初始长度增加 50%、100%、150%和 200%相对应的力值。
发现所有颜色的力与伸长率之间存在很强的线性关系。对于同一根管，在几乎所有研究的伸长率百分比下，以及对于不同的管，在研究的所有伸长率百分比下，都存在不同的力，除了红色和绿色管（所有伸长率），以及蓝色和黑色管在 50%伸长率时。
力学测试显示出每个管的不同伸长率水平下的不同弹性力。建议在临床情况下复制这些结果，以便更恰当地评估临床常规中的弹性阻力。
