Control of segment length or force in isolated papillary muscle: an adaptive approach.
Control of segment length or force in isolated papillary muscle: an adaptive approach.
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控制孤立乳头肌的节段长度或力：一种适应性方法。
DOI：
10.1152/ajpheart.1989.256.6.h1726
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Berman,MR
中科院分区：
文献类型：
--
作者：
Peterson,JN;Hunter,WC;Berman,MR
离体心肌的力学研究是复杂的，由于在切除和安装过程中对肌肉末端造成的损伤。肌肉的健康中心部分和弱化末端部分之间的不均匀性使得难以解释仅控制总肌肉长度的研究。中心段长度的测量和控制显然是期望的，但充满了技术困难。我们提出了一种新的自适应控制方法的应用，最大限度地减少了目前的控制技术遇到的困难。这种方法允许控制节段长度或力，利用了收缩的重复性和周期性。这里，在一次抽搐期间测量的节段长度或力信号与期望响应的偏差用于修改肌肉长度命令信号以用于下一次抽搐。该过程持续进行连续的抽动，直到节段长度或力在期望的限制内。自适应方法允许更大的稳定性和免疫力的噪声比经典的反馈策略。
Mechanical studies of isolated cardiac muscle are complicated as a result of damage inflicted on the ends of the muscle during excision and mounting procedures. Inhomogeneities between the healthy central and weakened end portions of the muscle make it difficult to interpret studies where only total muscle length is controlled. Measurement and control of central segment length is clearly desirable but fraught with technical difficulties. We present a novel application of adaptive control methods that minimizes the difficulties encountered with current control techniques. This method, which allows control of either segment length or force, takes advantage of the repetitive, periodic nature of contractions. Here deviations of measured segment length or force signals from a desired response during one twitch are used to modify the muscle length command signal for use on the next twitch. This process continues for successive twitches until either segment length or force is within desired limits. The adaptive method allows greater stability and immunity to noise than classical feedback strategies.