Douris Peter C, White Benjamin P, Cullen Robert R, Keltz William E, Meli John, Mondiello Dan M, Wenger David
Department of Physical Therapy, New York Institute of Technology, Old Westbury, NY 11568, USA.
J Strength Cond Res. 2006 Aug;20(3):699-703. doi: 10.1519/17204.1.
The purpose of this investigation was to establish a relationship between the number of repetitions an individual can complete at a predetermined load and their percentage of type II muscle fibers in their quadriceps. Subjects included 22 untrained women between the ages of 18 and 35. Day 1 consisted of noninvasive anthropologic testing, 1 repetition maximum (1RM) testing, and recording repetition performance at 70% 1RM. Day 2 consisted of isokinetic dynamometry to determine muscle fiber composition. Results were obtained and analyzed using the Pearson product correlation coefficient (r). The results demonstrated a fair-to-moderate relationship (Pearson r = -0.48, p = 0.02) that individuals with greater percentages of type II muscle fibers performed fewer repetitions at 70% 1RM. The results of this study demonstrate that muscle fiber type composition is an important variable to consider when designing training or rehabilitation programs.
本研究的目的是确定个体在预定负荷下能够完成的重复次数与其股四头肌中II型肌纤维百分比之间的关系。受试者包括22名年龄在18至35岁之间的未经训练的女性。第1天包括无创人体测量测试、1次重复最大值（1RM）测试以及记录70% 1RM时的重复表现。第2天包括等速测力法以确定肌肉纤维组成。使用皮尔逊积矩相关系数（r）获得并分析结果。结果显示出中等程度的关系（皮尔逊r = -0.48，p = 0.02），即II型肌纤维百分比更高的个体在70% 1RM时完成的重复次数更少。本研究结果表明，在设计训练或康复计划时，肌肉纤维类型组成是一个需要考虑的重要变量。
