Wilfrid Laurier University, Kinesiology & Physical Education, Waterloo, Canada.
Int J Sports Med. 2010 May;31(5):359-63. doi: 10.1055/s-0030-1247595. Epub 2010 Feb 10.
The purpose of this study was to examine perceived exertion responses during concentric and eccentric elbow flexor contractions between young adult men and women. Thirty healthy young adults participated in two experimental sessions. During the first session, subjects performed five concentric isokinetic maximal voluntary contractions (MVC) of elbow flexion, followed by nine, randomly-ordered sub-maximal contractions (10-90% MVC). The same procedures were repeated during the second session, with the exception that eccentric contractions were performed. Subjects rated their perceived exertion following the sub-maximal contractions with the Borg category-ratio scale. Perceived exertion was significantly (p<0.05) less than equivalent values on the CR-10 scale at intensities greater than, and equal to, 30% MVC. A three-factor interaction between 30-40% MVC indicated that perceived exertion increased more during the eccentric, than concentric, contractions in women, while the opposite pattern was evident for the men. There were no significant contraction mode or gender differences. Power function modeling revealed that perceived exertion increased in a negatively accelerating manner, except for the men performing eccentric exercise. Perceived exertion increases in a similar non-linear manner between men and women during concentric contractions, while men exhibited a statistically linear pattern during eccentric contractions.
本研究旨在比较年轻男性和女性在进行向心和离心肘屈肌收缩时的主观用力感知反应。30 名健康的年轻人参与了两个实验环节。在第一个环节中，受测者进行了五次最大等速向心肘屈肌收缩，随后进行了九次随机顺序的亚最大收缩（10-90% MVC）。第二个环节重复了同样的程序，只是进行了离心收缩。受测者在亚最大收缩后使用 Borg 比例等级量表对其主观用力感知进行了评估。在强度大于等于 30% MVC 的情况下，主观用力感知明显（p<0.05）低于 CR-10 量表的等效值。在 30-40% MVC 之间存在三因素交互作用，表明女性在离心收缩时的主观用力感知增加多于向心收缩，而男性则相反。收缩方式和性别之间没有显著差异。幂函数建模表明，除了男性进行离心运动外，主观用力感知以负加速的方式增加。在向心收缩期间，男性和女性的主观用力感知以相似的非线性方式增加，而男性在离心收缩期间表现出统计学上的线性模式。
