title: The effects of elbow joint angle changes on elbow flexor and extensor muscle strength and activation.
abstract: [Purpose] This research investigated the relationship between elbow joint angle and elbow flexor and extensor strength and activation, taking into consideration the length-tension tension curve of the muscle. [Subjects] There were 30 research subjects in total, 15 male and 15 female college students from Busan S University who had no functional disabilities that might affect measurement of muscle strength and muscle activation, and none had they experienced any damage in their upper extremities or hands. [Methods] The elbow joint angles were positioned at angles of 56°, 70° and 84°, and then muscle strength and activation were compared. Repeated measures ANOVA was used for statistical analysis, and the paired t-test was used to identify the difference between each angle. We used the SPSS for windows (ver. 21.0) statistical software and a significance level of α=0.05. [Results] The results showed that muscle strength and activation of the biceps was highest when the joint was placed at 56°. On the other hand, for the triceps, the result was highest when the joint angle was placed at 84°. [Conclusion] The tests confirmed that muscle strength and activation were highest at the joint angle at which the muscle was stretched to 20% more than the resting position in concentric contraction.
authors.affiliation: Division of Physical Education, College of Medical and Life Science, Silla University, Republic of Korea.
authors.forename: Jeongok
authors.initials: J
authors.lastname: Yang
authors.affiliation: Division of Physical Education, College of Medical and Life Science, Silla University, Republic of Korea.
authors.forename: Joongsook
authors.initials: J
authors.lastname: Lee
authors.affiliation: Division of Physical Education, College of Medical and Life Science, Silla University, Republic of Korea.
authors.forename: Bomjin
authors.initials: B
authors.lastname: Lee
authors.affiliation: Department of Physical Therapy, College of Medical and Life Science, Silla University, Republic of Korea.
authors.forename: Seounghoon
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Physical Therapy, College of Medical and Life Science, Silla University, Republic of Korea.
authors.forename: Dongho
authors.initials: D
authors.lastname: Shin
authors.affiliation: Department of Physical Therapy, College of Medical and Life Science, Silla University, Republic of Korea.
authors.forename: Younghyun
authors.initials: Y
authors.lastname: Lee
authors.affiliation: Department of Physical Therapy, College of Medical and Life Science, Silla University, Republic of Korea.
authors.forename: Jaeseok
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Physical Therapy, College of Medical and Life Science, Silla University, Republic of Korea.
authors.forename: Dongwook
authors.initials: D
authors.lastname: Han
authors.affiliation: Department of Social Welfare, College of Humanities and Social Sciences, Silla University, Republic of Korea.
authors.forename: Sunkoung
authors.initials: S
authors.lastname: Choi
keywords: Joint angle; Muscle activation; Muscle strength