EFFECTS OF STATIC AND RHYTHMIC TWITCH CONTRACTIONS ON THE DISCHARGE OF GROUP-III AND GROUP-IV MUSCLE AFFERENTS
EFFECTS OF STATIC AND RHYTHMIC TWITCH CONTRACTIONS ON THE DISCHARGE OF GROUP-III AND GROUP-IV MUSCLE AFFERENTS
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DOI：
10.1093/cvr/18.11.663
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发表时间：
1984-01-01
影响因子：
10.8
通讯作者：
MITCHELL, JH
中科院分区：
文献类型：
--
作者：
KAUFMAN, MP;WALDROP, TG;MITCHELL, JH
尽管麻醉猫后肢肌肉的静态和节律性抽搐收缩都能反射性地引起升压反应，但前者引起的动脉压增加明显大于后者。单组III和IV肌肉传入的冲动活动，其激活反射性地增加动脉压，记录，而小腿三头肌的麻醉猫静态和有节奏的抽搐收缩。第三组传入神经（n = 17）释放更多的冲动，在响应静态收缩比响应节律性收缩。第四组传入神经（n = 18）发射了大约相同数量的冲动，以响应2种类型的收缩。许多第三组，但只有少数的第四组传入显示放电特性，暗示这些传入的mechanoreceptors。第三组传入神经的放电可能是静态和节律性收缩引起的反射性升压反应幅度差异的原因。
Although both static and rhythmic twitch contractions of the hindlimb muscles of anesthetized cats were shown to reflexly evoke pressor responses, the increase in arterial pressure evoked by the former type of contraction was shown to be substantially larger than that evoked by the latter. The impulse activity of single group III and IV muscle afferents, whose activation reflexly increases arterial pressure, was recorded while the triceps surae muscles of anesthetized cats were statically and rhythmically twitch-contracted. Group III afferents (n = 17) discharged significantly more impulses in response to static contraction than in response to rhythmic contraction. Group IV afferents (n = 18) fired approximately the same number of impulses in response to the 2 types of contraction. Many of the group III but only a few of the group IV afferents displayed discharge properties suggestive that these afferents were mechanoreceptors. The discharge of group III afferents are likely to be responsible for the difference in the magnitudes of the reflex pressor responses evoked by static and rhythmic contraction.