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首页> 外文期刊>Journal of Neuroscience Methods >Cutaneous responsiveness of rat single motor units activated by natural stimulation.
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Cutaneous responsiveness of rat single motor units activated by natural stimulation.

机译：自然刺激激活大鼠单个运动单位的皮肤反应性。

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Recordings of withdrawal reflexes have been used extensively to study sensory-motor integration and processing of nociceptive information in the spinal cord. We describe here a new technique for the manufacture of improved EMG electrodes that permit the characterisation of the physiological properties of single motor units as well as the easy location of the muscles studied. Individual motor units from three rat hind-limb muscles: peroneus longus, tibialis cranialis and extensor digitorum longus, were activated by thermal and mechanical stimulation applied to their cutaneous receptive fields, which were located mainly on the 4th and 5th toes. Thresholds for thermal and mechanical (Von Frey hairs) stimulation were similar in the three muscles studied, with a value of 44 +/- 1 degrees C and 100 mN (median), respectively. However, when a mechanical pincher with a stimulus area of 14 mm2 was used, the values seen were similar for peroneus longus and tibialis cranialis (342 +/- 23 and 330 +/- 71 mN, respectively, mean +/- S.E.M.) but lower for extensor digitorum longus (220 +/- 37 mN, mean +/- S.E.M.). The firing rate of the single motor units was similar for all types of stimulation at threshold intensity, and showed a linear relationship with stimulus intensity, except for units of the tibialis cranialis, which showed a greater degree of adaptation.
机译：撤退反射的记录已被广泛用于研究感觉运动整合和脊髓中伤害感受信息的处理。我们在这里描述了一种用于制造改进的EMG电极的新技术，该技术可以表征单个运动单元的生理特性以及所研究肌肉的轻松位置。来自三个大鼠后肢肌肉的腓肠肌，胫骨胫骨和趾长伸肌的单个运动单位通过对其皮肤感受野施加的热和机械刺激而被激活，它们主要位于第4和第5趾。在所研究的三块肌肉中，热刺激和机械刺激（冯·弗雷毛发）的阈值相似，分别为44 +/- 1摄氏度和100 mN（中值）。但是，当使用刺激面积为14 mm2的机械钳时，所见的腓骨长骨和胫骨胫骨的值相似（分别为342 +/- 23和330 +/- 71 mN，均值+/- SEM），但是指趾长伸肌较低（220 +/- 37 mN，平均值+/- SEM）。对于所有类型的刺激，在阈值强度下，单个运动单位的发动率相似，并且与胫骨胫骨的单位相比，与刺激强度呈线性关系，胫骨的单位适应性更高。

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