Recent works have shown bioelectrical impedance spectroscopy (BIS) may assess tissue quality. The purpose of this project was to examine associations between ultrasound echo intensity (EI) of quadriceps muscles (vastus lateralis [VL], vastus medialis [VM], vastus intermedius [VI], rectus femoris [RF]) and BIS parameters (R0, R1, C, α, fp), and if the associations are specific to individual muscles or associated with a representation of the entire quadriceps. Twenty-two participants (age: 22 ± 4 years; BMI: 25.47 ± 3.26 kg/m²) participated in all study activities. Participants had transverse ultrasound scans of each individual quadriceps muscle taken at 25, 50, and 75 % of the muscle length to generate an average EI for the VL, VM, VI, and RF, which were further averaged to generate an EI for the entire quadriceps. For BIS, participants were seated with electrodes placed on the thigh to measure the segmental quadriceps. The Cole-impedance model parameters that best fit the BIS data for each participant was used for all analyses. Pearson's correlation coefficient (r) were calculated to determine associations between muscles’ EI and BIS parameters. The results suggest averaged EI of individual VL, VM, VI, RF muscles and the average EI of the segmental quadriceps were significantly related to the R0, C, α metrics of the Cole-impedance model representing quadriceps segmental tissues. This supports that segmental BIS may be an appropriate technique for rapid evaluation of segmental muscle quality.

最近的研究表明生物电阻抗光谱（BIS）可以评估组织质量。该项目的目的是检查股四头肌（股外侧肌 [VL]、股内侧肌 [VM]、股中间肌 [VI]、股直肌 [RF]）的超声回波强度 (EI) 与 BIS 参数 (R0 、 R1,  C , α, fp )，以及关联是否特定于单个肌肉或与整个股四头肌的表示相关。22 名参与者（年龄：22 ± 4 岁；BMI：25.47 ± 3.26 kg/m ² ）参加了所有研究活动。参与者对每块股四头肌在肌肉长度的 25%、50% 和 75% 处进行横向超声扫描，生成 VL、VM、VI 和 RF 的平均 EI，进一步平均以生成整个股四头肌的 EI股四头肌。对于 BIS，参与者坐着并将电极放置在大腿上以测量节段性股四头肌。所有分析均使用最适合每个参与者的 BIS 数据的科尔阻抗模型参数。计算Pearson 相关系数 ( r ) 以确定肌肉 EI 和 BIS 参数之间的关联。结果表明，单个 VL、VM、VI、RF 肌肉的平均 EI 和股四头肌节段的平均 EI 与代表股四头肌节段组织的 Cole 阻抗模型的R0、C、α指标显着相关。这支持节段 BIS 可能是快速评估节段肌肉质量的合适技术。