The frequency content of common synaptic inputs to motoneurones studied during voluntary isometric contraction in man.
The frequency content of common synaptic inputs to motoneurones studied during voluntary isometric contraction in man.
复制标题
研究人类自愿等长收缩过程中运动神经元常见突触输入的频率内容。
DOI：
--
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
J. Stephens
中科院分区：
文献类型：
--
作者：
S. Farmer;F. Bremner;D. Halliday;J. Rosenberg;J. Stephens
1.在人的手内在肌上记录了成对的单个运动单位的放电，当运动单位对的两个成员都位于第一背侧骨间肌（1DI：1DI记录）或一个运动单位位于1DI而另一个位于第二背侧骨间肌（1DI：2DI记录）时，获得单个运动单位的放电。运动单位锋电位序列对在时域中互相关，并将结果与对相同锋电位序列数据进行的相干性分析的结果进行比较。交叉强度函数中存在中心峰，表明存在对运动神经元对的共同突触输入。这些数据的相干性分析表明，1 - 12和16 - 32 Hz频率范围内的运动单位放电之间存在显著关联。2.对从单个运动单位对记录的连续非重叠数据段的分析表明，在整个长记录期间，1 - 12和16 - 32 Hz频带中的中心交叉强度峰和相干性是一致的特征。在这些连续记录中，中心交叉强度峰的大小和16 - 32 Hz频带中相干性的最大值随段而变化。对运动单位对的整个群体的分析证实了峰值相干性的幅度与中心交叉强度峰值的大小之间的正相关关系。3.发现从1DI内记录的成对个体运动单元的放电率的自愿正弦共调制产生与共同调制的频率对应的显著的相干值。然而，未发现放电率共调制影响中心交叉强度峰的大小或频带16 - 32 Hz中相干性的最大值。4.从健康受试者的1DI和肱二头肌内记录成对的单个运动单位。比较两块肌肉检测到的中心交叉强度峰和相干峰的数量和大小。与肱二头肌记录相比，发现1DI记录的中心交叉强度峰的发生率和大小以及16 - 32 Hz相干峰的发生率和幅度均更大。5.单个运动单位的录音，从内在的手肌肉的患者严重外周传入神经阻滞。这些记录的时域和频域分析显示，交叉强度峰和相干频带与健康受试者中观察到的相似。（400字处截断摘要）
1. The discharges of pairs of individual motor units were recorded from intrinsic hand muscles in man. Single motor unit recordings were obtained either when both members of the motor unit pair were within first dorsal interosseous muscle (1DI:1DI recordings) or where one motor unit was within 1DI and the other in second dorsal interosseous muscle (1DI:2DI recordings). The pairs of motor unit spike trains were cross‐correlated in the time domain and the results compared to those of coherence analysis performed on the same spike train data. Central peaks were present in the cross‐intensity functions, indicating the presence of common synaptic input to the motoneurone pair. Coherence analysis of these data indicated significant association between motor unit firing in the frequency ranges 1‐12 and 16‐32 Hz. 2. Analysis of sequential non‐overlapping segments of data recorded from individual motor unit pairs, demonstrated that both the central cross‐intensity peak and coherence in the frequency bands 1‐12 and 16‐32 Hz were consistent features throughout a long recording. In these sequential recordings, the size of the central cross‐intensity peak and the maximal value of coherence in the frequency band 16‐32 Hz covaried from segment to segment. Analysis of the entire population of motor unit pairs confirmed a positive relationship between the magnitude of peak coherence and the size of the central cross‐intensity peak. 3. Voluntary sinusoidal co‐modulation of the firing rates of pairs of individual motor units recorded from within 1DI was found to produce significant values of coherence corresponding to the frequency of the common modulation. However, firing rate co‐modulation was not found to affect either the size of the central cross‐intensity peak or the maximum value of coherence in the frequency band 16‐32 Hz. 4. Pairs of single motor units were recorded from within 1DI and biceps brachii muscles of healthy subjects. The number and size of the central cross‐intensity peaks and coherence peaks detected were compared for the two muscles. The incidence and size of central cross‐intensity peaks and the incidence and magnitude of 16‐32 Hz coherence peaks were both found to be greater for 1DI recordings when compared to biceps brachii recordings. 5. Single motor unit recordings were made from the intrinsic hand muscles of a patient with severe peripheral deafferentation. Time‐ and frequency‐domain analysis of these recordings revealed cross‐intensity peaks and frequency bands of coherence similar to those seen in healthy subjects.(ABSTRACT TRUNCATED AT 400 WORDS)
影响因子：
2.5
作者：
FETZ, EE;CHENEY, PD
通讯作者：
CHENEY, PD