INTRAMUSCULAR FLUID PRESSURE DURING ISOMETRIC CONTRACTION OF HUMAN SKELETAL-MUSCLE
INTRAMUSCULAR FLUID PRESSURE DURING ISOMETRIC CONTRACTION OF HUMAN SKELETAL-MUSCLE
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DOI：
10.1152/jappl.1984.56.2.287
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发表时间：
1984-01-01
影响因子：
3.3
通讯作者：
HERMANSEN, L
中科院分区：
文献类型：
--
作者：
SEJERSTED, OM;HARGENS, AR;HERMANSEN, L
在7名健康男性志愿者的股内侧肌中记录肌内液体压力。通过具有极低体积位移特性的导管尖端传感器和连接到狭缝导管的2个体外传感器同时测量肌肉中3个不同部位的压力。所有3个记录系统给出了定性相似的结果，前提是导管的内径超过0.53 mm，并且允许测量持续时间短至1 s的压力。吸液芯导管的反应比狭缝导管慢。在任何位置，肌内液体压力线性增加力最大随意收缩（MVC）。这些曲线的斜率变化很大，主要是因为压力也是距离筋膜的线性函数。记录的最高压力为570托。在延长的次最大收缩，肌内液体压力振荡独立的收缩力。压力-力关系和压力-深度关系两者的线性与基于拉普拉斯定律的简单模型相容，因为在该肌肉中肌肉纤维在收缩期间是弯曲的。据推测，血流首先在压力最高的肌肉深处受损，并且通常在与细长肌肉相比具有大曲率的短隆起肌肉中的应力或张力较低。
Intramuscular fluid pressures were recorded in the vastus medialis of 7 healthy male volunteers. Pressures were measured simultaneously at 3 different sites in the muscle by a catheter-tip transducer with extremely low volume-displacement characteristics, and by 2 extracorporeal transducers connected to slit catheters. All 3 recording systems gave qualitatively similar results, provided the catheters had inner diameters exceeding 0.53 mm and allowed measurement of pressures lasting as short as 1 s. Wick catheters yielded slower responses than slit catheters. At any position, intramuscular fluid pressure increased linearly with force up to maximal voluntary contraction (MVC). Slopes of these curves varied greatly, mainly because the pressure was also a linear function of the distance from the fascia. The highest recorded pressure was 570 Torr. At prolonged submaximal contractions, intramuscular fluid pressure oscillated independent of contraction force. The linearity of both the pressure-force relationship and the pressure-depth relationship is compatible with a simple model based on the law of Laplace, because the muscle fibers are curved during contraction in this muscle. It is hypothesized that blood flow is first compromised deep in the muscle where pressure is highest, and in general, at lower stress or tension in short bulging muscles with great curvature of the fibers compared with long slender ones.