Recovery and perturbation of paw-shake responses in spinal cats.
Recovery and perturbation of paw-shake responses in spinal cats.
复制标题
脊椎猫的爪子震动反应的恢复和扰动。
DOI：
10.1152/jn.1984.51.4.680
复制
发表时间：
1984
影响因子：
2.5
通讯作者：
Smith,JL
中科院分区：
文献类型：
--
作者：
Sabin,C;Smith,JL
在9只猫的后爪周围缠绕遮蔽胶带，在2或12周龄或作为年轻的成年人（10-12月）在T12水平脊髓引起的爪振动反应（PSR）。在脊髓横断后6个月内记录踝伸肌（LG和SOL）和踝屈肌（TA）的肌电反应。LG的活性用于确定循环特性。在不同年龄的猫脊髓的周期特征没有差异。平均PSR由11个周期组成，周期时间为85 ms，与正常成年猫的PSR相似（16）。在TA和LG肌肉的活动交替发生在伸肌周期的52%的屈肌爆发的发病。爆发持续时间平均为39和57毫秒的LG和TA肌肉，分别。相对正常的PSR诱发脊髓切断术后48小时内的成年猫;差异是，反应引起的频率较低，更少，稍长的周期时间比正常。脊髓横断后2周内，PSR参数恢复正常值。在脊髓猫中，SOL在PSR期间是活跃的，显示出与LG共同活动的强直性低水平活动或离散爆发。在正常成年猫中，慢伸肌（SOL）通常是不活跃的（16）。在脊髓型猫中，SOL的参与可能取决于肌肉单位从缓慢收缩到快速收缩的转换（8，13），或者取决于下行束对慢运动单位的抑制（11）。这两种机制进行了讨论。（250字处删节）
Paw-shake responses (PSRs) were evoked by wrapping masking tape around the hind-paw in nine cats spinalized at the T12 level either at 2 or 12 wk of age or as young adults (10-12 mo). Electromyographic responses of ankle extensors (LG and SOL) and one ankle flexor (TA) were recorded through the 6th mo after cord transection. Activity of the LG was used to determine the cycle characteristics. Cycle characteristics did not differ among cats spinalized at different ages. The average PSR, consisting of 11 cycles with a cycle time of 85 ms, was similar to the PSR of normal adult cats (16). Activity in the TA and LG muscles alternated with the onset of the flexor burst occurring at 52% of the extensor cycle. Burst durations averaged 39 and 57 ms for LG and TA muscles, respectively. Relatively normal PSRs were evoked within 48 h following cordotomy of the young-adult cats; differences being that the responses were elicited less frequently with fewer and slightly longer cycle times than normal. Within 2 wk following cord transection, PSR parameters returned to normal values. In the spinal cats, the SOL was active during PSR, showing either tonic low-level activity or discrete bursts that were coactive with the LG. In normal adult cats, the slow extensor (SOL) is usually inactive (16). In spinal cats, participation of the SOL may depend on a conversion of muscle units from slow to fast contracting (8, 13) or on the absence of inhibition of slow motor units from descending tracts (11). Both mechanisms are discussed.(ABSTRACT TRUNCATED AT 250 WORDS)