Neck inspiratory muscle activation patterns during well-controlled condition
Neck inspiratory muscle activation patterns during well-controlled condition
复制标题
良好控制条件下的颈部吸气肌激活模式
DOI：
10.1007/s00421-017-3699-5
复制
发表时间：
2017
影响因子：
3
通讯作者：
Yasuhide Yoshitake.
中科院分区：
文献类型：
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作者：
ohei Washino;Hiroaki Kanehisa;Yasuhide Yoshitake.
目的令人惊讶的是，颈部吸气肌的激活特征作为关键吸气机械参数的函数尚未在良好控制的条件下通过实验证明。本研究旨在阐明颈部吸气肌肉的肌肉激活模式，严格控制流速和肺volume.MethodsThirteen健康受试者匹配他们的吸气流速在大约20-100%的峰值流速（PFR）稳定尽可能在吸气。在对应于肺容量增加10%用力肺活量（FVC）的持续时间内，每增加%PFR，以及对应于流速增加20%PFR的点上，每增加5% FVC，计算胸锁乳突肌（SCM）和斜角肌的表面肌电图（EMG）振幅，以确定%PFR-EMG和%FVC-EMG关系，结果回归分析显示，随着%PFR的增加，颈部吸气肌肌电图呈指数增加，而反映肺复张开始的相关变量随着%FVC的增加而增加。在%FVC-EMG关系中，线性回归分析显示，在所有%PFR和正截距在80%PFR.ConclusionsThe主要的新发现是，颈部吸气肌活动增加流量以及肺容量。在较高的%PFR下，%FVC-EMG关系的正截距表明，即使当肺容量水平较低时，颈部吸气肌也总是被激活，这意味着SCM不一定是先前观察中所描述的“辅助”肌。
PurposeSurprisingly, the activation characteristics of the neck inspiratory muscles as a function of key inspiratory mechanical parameters have yet to be demonstrated experimentally under well-controlled conditions. This study aimed to elucidate the muscle activation patterns of the neck inspiratory muscles by strictly controlling flow rate and lung volume.MethodsThirteen healthy subjects matched their inspiratory flow rate at approximately 20–100% of peak flow rate (PFR) as steady as possible during inspiration. Amplitude of surface electromyogram (EMG) of the sternocleidomastoid (SCM) and scalene were calculated for every increase in %PFR over a duration corresponding to an increase in lung volume by 10% of forced vital capacity (FVC), as well as for every 5% increment of FVC over a point corresponding to an increase in flow rate by 20%PFR to determine the %PFR–EMG and %FVC–EMG relations, respectively.ResultsRegression analyses showed that EMGs of the neck inspiratory muscles exponentially increased with increase in %PFR and their associated variables which reflect recruitment onset when increasing flow rate increased with increasing %FVC. In %FVC–EMG relation, a linear regression analysis showed positive slope at all %PFR and positivey-intercept at 80% PFR.ConclusionsThe main new finding is that the neck inspiratory muscle activities increase with flow rate as well as lung volume. The positivey-intercept of the %FVC–EMG relation at higher %PFR indicates that the neck inspiratory muscles are always activated even when lung volume level is low, implying that SCM is not necessarily an “accessory” muscle as described in previous observations.