Lambertz Daniel, Paiva Maria G, Marinho Sonia M O C, Aragão Raquel Silva, Barros Karla M F T, Manhães-de-Castro Raul, Khider Nassim, Canon Francis
Departamento de Nutrição, Universidade Federal de Pernambuco, Av Prof Moraes Rêgo, 1235, Cidade Universitária, 50670-901 Recife, PE, Brazil.
J Biomech. 2008 Nov 14;41(15):3270-3. doi: 10.1016/j.jbiomech.2008.08.022. Epub 2008 Oct 10.
The use of biomechanical methods to quantify functional/physiological parameters in malnourished humans can provide new insights into the understanding of effects of malnutrition on human muscles. Therefore, a transportable ankle ergometer device was developed, which allows the quantification of mechanical properties of the human plantarflexor muscles in field experiments. More precisely, the ergometer quantifies isometric force in static conditions and musculotendinous stiffness in dynamic conditions. This latter parameter is obtained by the quick-release technique. The aim of the study was first to conduct a reproducibility study on musculotendinous stiffness. Seven healthy subjects were tested three times in alternate days. The results showed the well-known linear relationship between musculotendinous stiffness and torque, where the slope was used as a stiffness index (SI(MT)). Individual regression line comparison indicated that SI(MT) values were not significantly different between the three repeated measurements (P>0.05). Mean coefficient of variation was 4.5+/-1.0%. The individual SI(MT) data were within the range of those reported in the literature. The reproducibility study showed that the quantification of musculotendinous stiffness by means of the quick-release technique is a reliable method, using a transportable ankle ergometer device.
运用生物力学方法来量化营养不良人群的功能/生理参数，能够为理解营养不良对人体肌肉的影响提供新的见解。因此，研发了一种便携式踝关节测力计装置，它能够在现场实验中对人体跖屈肌的力学特性进行量化。更确切地说，该测力计可在静态条件下量化等长力，并在动态条件下量化肌肉肌腱僵硬度。后一个参数是通过快速释放技术获得的。本研究的目的首先是对肌肉肌腱僵硬度进行重复性研究。七名健康受试者每隔一天接受三次测试。结果显示了肌肉肌腱僵硬度与扭矩之间众所周知的线性关系，其中斜率被用作僵硬度指数（SI(MT)）。个体回归线比较表明，三次重复测量之间的SI(MT)值没有显著差异（P>0.05）。平均变异系数为4.5±1.0%。个体SI(MT)数据在文献报道的范围内。重复性研究表明，使用便携式踝关节测力计装置，通过快速释放技术量化肌肉肌腱僵硬度是一种可靠的方法。
