Interlimb postural coordination in the standing cat
Interlimb postural coordination in the standing cat
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DOI：
10.1113/jphysiol.2006.104893
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发表时间：
2006-05-15
影响因子：
5.5
通讯作者：
Beloozerova, Irina N.
中科院分区：
文献类型：
--
作者：
Deliagina, Tatiana G.;Sirota, Mikhail G.;Beloozerova, Irina N.
站立四足动物背侧朝上的身体姿势是通过四个肢体的协调活动来维持的。我们研究了猫站在额状面周期性倾斜的平台上的这种协调性。通过悬挂不同的身体部位，我们卸载了一根、两根或三根肢体。记录所选伸肌的活动和四肢下的接触力。当所有四个肢体都在平台上时，在同侧向下倾斜期间，前肢和后肢的伸肌同时增加其活动。由于两个前肢位于平台上，这种肌肉模式在前肢和悬挂的后肢中持续存在。当两个后肢放在平台上时，肌肉模式仅在后肢中持续存在，而在悬挂的前肢中则不然。这些结果表明，两个腰带之间的协调主要基于前肢对后肢的影响。然而，这些影响并不一定决定后肢倾斜的反应。前躯和后躯的反相倾斜证明了这一点。在这些条件下，前肢和后肢的伸肌出现解耦并反相调节，表明前肢和后肢对姿势的独立控制。仅一侧肢体支撑肩部或髋部带，在该带的两侧肢体中观察到具有正常相位的肌肉模式。这一发现表明，单个肢体的反射机制仅产生部分姿势矫正；另一部分是在交叉影响的基础上产生的。
The dorsal-side-up body posture in standing quadrupeds is maintained by coordinated activity of four limbs. We studied this coordination in the cat standing on the platform periodically tilted in the frontal plane. By suspending different body parts, we unloaded one, two, or three limbs. The activity of selected extensor muscles and the contact forces under the limbs were recorded. With all four limbs on the platform, extensors of the fore- and hindlimbs increased their activity in parallel during ipsilateral downward tilt. With two forelimbs on the platform, this muscular pattern persisted in the forelimbs and in the suspended hindlimbs. With two hindlimbs on the platform, the muscular pattern persisted only in the hindlimbs, but not in the suspended forelimbs. These results suggest that coordination between the two girdles is based primarily on the influences of the forelimbs upon the hindlimbs. However, these influences do not necessarily determine the responses to tilt in the hindlimbs. This was demonstrated by antiphase tilting of the fore- and hindquarters. Under these conditions, the extensors of the fore- and hindlimbs appeared uncoupled and modulated in antiphase, suggesting an independent control of posture in the fore- and hindquarters. With only one limb supporting the shoulder or hip girdle, a muscular pattern with normal phasing was observed in both limbs of that girdle. This finding suggests that reflex mechanisms of an individual limb generate only a part of postural corrections; another part is produced on the basis of crossed influences.