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Comparison Thigh Skeletal Muscles between Snowboarding Halfpipe Athletes and Healthy Volunteers Using Quantitative Multi-Parameter Magnetic Resonance Imaging at Rest

2018; Lippincott Williams & Wilkins; Volume: 131; Issue: 9 Linguagem: Inglês

10.4103/0366-6999.230740

2542-5641

He Sun, Mengtao Xu, Xiaoqi Wang, Meng-Hu Wang, Wang Bao-heng, Fengzhe Wang, Shinong Pan,

Sports Performance and Training

Magnetic resonance (MR) imaging provides a unique, noninvasive diagnostic platform to quantify the physiological and biochemical variables of skeletal muscle at rest. This study was to investigate the difference in thigh skeletal muscles between snowboarding halfpipe athletes and healthy volunteers via multiparametric MR imaging.A comparative study was conducted between 12 healthy volunteers and 14 snowboarding halfpipe athletes. MR scanning targeted the left leg at the level of the proximal thigh on a 3.0T MR system. The measured parameters compared between the two groups included T1, T2, T2* relaxation times, fat fraction (FF), and cross-sectional area (CSA) of the quadriceps femoris and the hamstring muscles. Statistical analysis was carried out using independent sample t-test. Interrater reliability was also assessed with intraclass correlation coefficients (ICCs).It was statistically equivalent between two groups in age, body mass index, thigh circumference, calf circumference, systolic blood pressure, and resting heart rate (all P > 0.05). However, the T1 and T2 values of the hamstring muscles in the athlete group were found to be significantly shorter than those in control group (T1: 1063.3 ± 24.1 ms vs. 1112.0 ± 38.2 ms in biceps femoris, 1050.4 ± 31.2 ms vs. 1095.0 ± 39.5 ms in semitendinosus, 1053.1 ± 31.7 ms vs. 1118.4 ± 40.0 ms in semimembranosus, respectively; T2: 33.4 ± 0.7 ms vs. 36.1 ± 1.9 ms in biceps femoris, 34.6 ± 2.0 ms vs. 37.0 ± 1.9 ms in semitendinosus, 36.9 ± 1.5 ms vs. 38.9 ± 2.4 ms in semimembranosus, respectively; all P < 0.05) although T2* relaxation time was detected with no significant difference. The FF of the hamstring muscles was obviously less than the control group (5.5 ± 1.9% vs. 10.7 ± 4.7%, P < 0.001). In addition, the quadriceps' CSA in the athlete group was substantially larger than the control group (8039.0 ± 1072.3 vs. 6258.2 ± 852.0 mm2, P < 0.001). Interrater reliability was excellent (ICC: 0.758-0.994).Multiple MR imaging parameters indicated significant differences between snowboarding halfpipe athletes and healthy volunteers in the thigh skeletal muscles.利用定量多参数磁共振成像对比静息状态下单板滑雪运动员与健康志愿者大腿骨骼肌的差异摘要背景：磁共振成像提供一个唯一无创的诊断平台来量化骨骼肌在静息状态时的生理和生化改变。本研究旨在通过多参数磁共振成像研究单板滑雪运动员与健康志愿者之间大腿骨骼肌的差异。 方法：12名健康志愿者和14名单板滑雪运动员进行比较研究。扫描在3.0T磁共振系统，定位为左大腿近端水平。比较两组股四头肌和腘绳肌的T1，T2，T2 *弛豫时间和脂肪分数及肌肉横截面积等定量参数。利用独立样本t检验进行统计分析。评判间信度用组内相关系数进行评估。 结果：两组在年龄、身体质量指数、大腿围、小腿围，收缩压和静息心率中无统计学差异。然而，在运动员组中，发现腘绳肌的T1和T2值显著短于志愿者组（T1值: 股二头肌为1063.3±24.1 ms vs. 1112.0±38.2 ms, 半腱肌为1050.4±31.2 ms vs.1095.0±39.5 ms, 半膜肌为1053.1±31.7 ms vs. 1118.4±40.0 ms；T2值: 股二头肌为33.4±0.7 ms vs. 36.1±1.9 ms,半腱肌为34.6±2.0 ms vs. 37.0±1.9 ms，半膜肌为36.9±1.5 ms vs. 38.9±2.4 ms；所有P <0.05）。T2*值并没有统计学差异在所有肌肉中。腘绳肌的脂肪分数显著少于对照组（5.5±1.9% vs. 10.7±4.7%, P < 0.001）。此外，运动员组股四头肌的横截面积显著大于志愿者组（8039.0±1072.3 mm2 vs. 6258.2±852.0 mm2, P < 0.001）。评判间信度的可靠性非常好（组内相关系数为0.758-0.994）。 结论：磁共振多参数在单板滑雪运动员与健康志愿者大腿骨骼肌之间存在显著差异。.