Monteiro A A, Kopp S
Department of Clinical Oral Physiology, School of Dentistry, Karolinska Institutet, Huddinge, Sweden.
Acta Odontol Scand. 1989 Oct;47(5):329-36. doi: 10.3109/00016358909007720.
The reproducibility of estimations of the masseter intramuscular blood flow (IMBF) was assessed bilaterally within and between clinical sessions. The 133Xe clearance in nine normal individuals was measured before, during, immediately after, and after endurance of isometric contraction at an attempted level of 50% of maximum voluntary clenching contraction. An overall low reproducibility of the estimations was found. This result was probably caused by uncertainties about the exact site of intramuscular 133Xe deposition, errors in assessment of the plots of clearance, and variabilities in the relative contraction levels sustained and, especially, in the overall muscle effort. In agreement with previous reports concerning other skeletal muscles, the 133Xe clearance method provided inconsistent estimates of absolute values of IMBF also in this clinical setting. Although there was a high intra-individual variation in the relative level of isometric contraction sustained, the endurance test induced distinct changes in IMBF, among which the estimate of post-endurance hyperemia was the most consistent for each individual. Therefore, measurements of 133Xe clearance seem to be useful to detect intra-individual changes in masseter IMBF resulting from isometric work.
在临床疗程内和疗程间，对双侧咬肌肌内血流（IMBF）估计值的可重复性进行了评估。在9名正常个体中，于最大自主紧咬收缩的50%的尝试水平进行等长收缩之前、期间、之后即刻以及耐力收缩之后，测量了133Xe清除率。发现估计值的总体可重复性较低。该结果可能是由于肌内133Xe沉积的确切部位存在不确定性、清除率曲线评估中的误差，以及持续的相对收缩水平尤其是总体肌肉用力的变异性所致。与先前关于其他骨骼肌的报告一致，在这种临床环境中，133Xe清除率方法对IMBF绝对值的估计也不一致。尽管在持续的等长收缩相对水平上存在较高的个体内差异，但耐力测试引起了IMBF的明显变化，其中耐力收缩后充血的估计值对每个个体而言最为一致。因此，133Xe清除率测量似乎有助于检测等长运动引起的咬肌IMBF的个体内变化。
