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在骨骼肌非单调变化曲线的单调增与单调减变化的转折点处分段，分别建立灰模型。残差检验表明该模型的精度优于全数据序列建立的灰模型，并得出结论：单调变化曲线的灰模型能很好地反映骨骼肌收缩曲线上升期和缓慢下降期的发展变化过程，序列的分段、联合是提高非单调变化曲线的灰模型精度的一种有效方法。
In the non-monotonically changing curve of skeletal monotonous increase and monotonically decreasing turning point at the segment, respectively, to establish gray model. Residuals test showed that the accuracy of the model was better than that of the whole data model. The conclusion was drawn that the gray model of the monotone curve could well reflect the process of the development and decline of the skeletal muscle contraction curve and the slow decline phase. Is an effective way to improve the accuracy of the gray model of non-monotonous curves.