Phonation-related rate coding and recruitment in the genioglossus muscle.
Phonation-related rate coding and recruitment in the genioglossus muscle.
复制标题
颏舌肌中发声相关的速率编码和募集。
DOI：
10.1007/s00221-015-4284-y
复制
发表时间：
2015
影响因子：
2
通讯作者：
Bailey,EF
中科院分区：
文献类型：
--
作者：
Shumway,KR;Porfirio,DJ;Bailey,EF
在具有相似肌纤维类型组成且参与熟练运动的两块肌肉中评估运动单位募集：舌肌、颏舌肌（GG）和手部肌肉，第一背侧骨间肌（FDI）。我们的主要目标是确定在随意运动的框架内，舌头的肌肉力量是否像肢体一样受到调节，即通过速率编码和募集过程。在元音产生过程中，在斜坡力（FDI）和舌头（GG）的背景下，特别是在响度斜坡增加的背景下，评估每个受试者的两块肌肉的募集情况，并随后相对于最大值进行表达。该研究的主要发现是，招募和速率编码的一般规则对于 GG 和 FDI 都适用，其次，尽管在相当的兵力范围（最大的 2-40%）内执行任务，但 GG 的平均射击率、招募时射击率和峰值射击率均显着高于 FDI（P<0.001）。在发声的情况下在舌头中观察到的较高发射率可能是该肌肉作为（主要）运动者和静水支撑元件的双重作用的函数。
Motor unit recruitment was assessed in two muscles with similar muscle fiber-type compositions and that participate in skilled movements: the tongue muscle, genioglossus (GG), and the hand muscle, first dorsal interosseous (FDI). Our primary objectives were to determine in the framework of a voluntary movement whether muscle force is regulated in tongue as it is in limb, i.e., via processes of rate coding and recruitment. Recruitment in the two muscles was assessed within each subject in the context of ramp force (FDI) and in the tongue (GG) during vowel production and specifically, in the context of ramp increases in loudness, and subsequently expressed relative to the maximal. The principle findings of the study are that the general rules of recruitment and rate coding hold true for both GG and FDI, and second, that average firing rates, firing rates at recruitment and peak firing rates in GG are significantly higher than for FDI (P< 0.001) despite tasks performed across comparable force ranges (~2–40 % of max). The higher firing rates observed in the tongue within the context of phonation may be a function of that muscle’s dual role as (prime) mover and hydrostatic support element.