Behm D G, St-Pierre D M, Perez D
School of Physical and Occupational Therapy, McGill University, Montreal, Quebec, Canada.
J Appl Physiol (1985). 1996 Nov;81(5):2267-73. doi: 10.1152/jappl.1996.81.5.2267.
The validity, reliability, and protocol for the interpolated twitch technique (ITT) were investigated with isometric plantar flexor and leg extension contractions. Estimates of muscle inactivation were attempted by comparing a variety of superimposed with potentiated evoked torques with submaximal and maximal voluntary contraction (MVC) torques or forces. The use of nerve and surface stimulation to elicit ITT was reliable, except for problems in maintaining maximal stimulation with nerve stimulation at 20 degrees plantar flexion and during leg extension. The interpolated twitch ratio-force relationship was best described by a shallow hyperbolic curve resulting in insignificant MVC prediction errors with second-order polynomials (1.1-6.9%). The prediction error under 40% MVC was approximately double that over 60% MVC, contributing to poor estimations of MVC in non-weight-bearing postimmobilized ankle fracture patients. There was no significant difference in the ITT sensitivity when twitches, doublets, or quintuplets were used. The ITT was valid and reliable when high-intensity contractions were analyzed with a second-order polynomial.
采用等长跖屈和腿部伸展收缩对插值抽搐技术（ITT）的有效性、可靠性和方案进行了研究。通过比较多种叠加的与增强的诱发扭矩与次最大和最大自主收缩（MVC）扭矩或力量，尝试对肌肉失活进行估计。除了在跖屈20度和腿部伸展时用神经刺激维持最大刺激存在问题外，使用神经和表面刺激引发ITT是可靠的。插值抽搐比率-力量关系最好用一条浅双曲线来描述，二阶多项式导致的MVC预测误差不显著（1.1 - 6.9%）。低于40%MVC时的预测误差约为高于60%MVC时的两倍，这导致非负重固定后踝关节骨折患者的MVC估计不佳。使用单抽搐、双脉冲或五脉冲时，ITT敏感性无显著差异。当用二阶多项式分析高强度收缩时，ITT是有效且可靠的。
