Dynamic and static sensitivities of muscle spindle primary endings in aged rats to ramp stretch

被引：73

作者：

Miwa, T ^{[1
]}

Miwa, Y ^{[1
]}

Kanda, K ^{[1
]}

机构：

[1] TOKYO METROPOLITAN INST GERONTOL,DEPT CENT NERVOUS SYST,ITABASHI KU,TOKYO 173,JAPAN

来源：

NEUROSCIENCE LETTERS | 1995年 / 201卷 / 02期

关键词：

muscle spindle; afferent discharge; ramp stretch; aging; rat;

D O I：

10.1016/0304-3940(95)12165-X

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

Responses of the presumed primary sensory endings of de-efferented muscle spindles to a ramp stretch were investigated in the medial gastrocnemius muscle of male Fischer 344 rats of two age groups (i.e. 10-14 and 28-30 months) anesthetized with urethane and chloralose. The static sensitivity was similar for both middle-aged and aged rats, although the discharge frequency was lower for aged rats when compared at the same muscle length. The value of the dynamic index was significantly lower in aged rats than in middle-aged rats, suggesting a decrease in the dynamic sensitivity of muscle spindle primary endings in aged rats.

引用

页码：179 / 182

页数：4

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