MYOTOMAL MUSCLE FUNCTION AT DIFFERENT LOCATIONS IN THE BODY OF A SWIMMING FISH
MYOTOMAL MUSCLE FUNCTION AT DIFFERENT LOCATIONS IN THE BODY OF A SWIMMING FISH
复制标题
游动鱼体内不同位置的肌节肌肉功能
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
C. I. Smith
中科院分区：
文献类型：
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作者：
J. Altringham;C. S. Wardle;C. I. Smith
我们描述了对分离的活肌纤维进行的实验，这些实验模拟了它们在游泳的绿虾（Pollachius virens）中的体内活动。从距前尖 0.35、0.5 和 0.65 体长 (BL) 的点分离出的浅表快肌纤维具有不同的收缩特性。从头侧肌节到尾侧肌节，抽搐收缩时间增加，功率输出（通过工作循环技术测量）减少。头端纤维的功率与周期频率曲线相对于尾端纤维的频率移动到更高的频率。在鱼中，肌肉激活的尾部行波和鱼弯曲之间的相位差表明身体肌肉功能的变化。体外实验表明，体内头侧肌节的浅表快纤维在产生最大功率输出的条件下工作。尾部肌刀在体内被拉长时是活跃的，并且在进入正发电阶段之前最初在使其刚度最大化的条件下运行。描述了通过浅层、快速、侧向肌肉在尾叶片处产生推力。头部产生的动力通过位于尾部的僵硬肌肉传递到尾部。发电和硬化之间的过渡区沿尾部移动，除了最尾部的肌节之外，所有肌节都会在尾部搏动的某个阶段产生动力。当尾叶穿过泳道时，吻部功率输出、尾部力、弯矩和尾叶处的力在尾拍周期中基本相同的时刻都达到最大。
We describe experiments on isolated, live muscle fibres which simulate their in vivo activity in a swimming saithe (Pollachius virens). Superficial fast muscle fibres isolated from points 0.35, 0.5 and 0.65 body lengths (BL) from the anterior tip had different contractile properties. Twitch contraction time increased from rostral to caudal myotomes and power output (measured by the work loop technique) decreased. Power versus cycle frequency curves of rostral fibres were shifted to higher frequencies relative to those of caudal fibres. In the fish, phase differences between caudally travelling waves of muscle activation and fish bending suggest a change in muscle function along the body. In vitro experiments indicate that in vivo superficial fast fibres of rostral myotomes are operating under conditions that yield maximum power output. Caudal myotomes are active as they are lengthened in vivo and initially operate under conditions which maximise their stiffness, before entering a positive power-generating phase. A description is presented for the generation of thrust at the tail blade by the superficial, fast, lateral muscle. Power generated rostrally is transmitted to the tail by stiffened muscle placed more caudally. A transition zone between power generation and stiffening travels caudally, and all but the most caudal myotomes generate power at some phase of the tailbeat. Rostral power output, caudal force, bending moment and force at the tail blade are all maximal at essentially the same moment in the tailbeat cycle, as the tail blade crosses the swimming track.
DOI：
10.1152/ajpcell.1991.260.2.c289
发表时间：
1991
期刊：
The American journal of physiology
影响因子：
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作者：
Rome,LC;Sosnicki,AA
通讯作者：
Sosnicki,AA