title: Analysis of trunk muscle activity in the side medicine-ball throw.
abstract: The purpose of this study was to compare the electromyogram (EMG) activity of the trunk musculature for long throwers and short throwers during the side medicine-ball throw. The study consisted of 2 sessions. Thirty athletes performed the side medicine-ball throw (S-MBT) in the first session. The top 5 subjects (long throwers) and the worst 5 subjects (short throwers) in the performance of the S-MBT proceeded to the second session. These subjects performed the fast side medicine-ball throw (FS-MBT) and the isometric maximal trunk rotation torque (IMTRT) test after applying surface electrodes bilaterally to the following muscles: pectoralis major, rectus abdominis, external oblique, and latissimus dorsi. The value of IMTRT in the left turn in long throwers was significantly greater (p < 0.05) than that recorded for short throwers, whereas no difference was observed in the right turn. The velocities of the medicine ball using 2-kg, 4-kg, and 6-kg medicine balls were significantly different (p < 0.01-0.001) between long throwers and short throwers The examination of EMG activity in each muscle group for long throwers and short throwers revealed that the major difference between the 2 groups is EMG activity of the left external oblique. These results suggest that the EMG activity of the external oblique on either side is an important factor for FS-MBT.
authors.affiliation: Department of Sports Sciences, Japan Institute of Sports Sciences, Tokyo, Japan. Ikeda, ikeda.yusuke.trsc@gmail.com
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Ikeda
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Miyatsuji
authors.forename: Koichi
authors.initials: K
authors.lastname: Kawabata
authors.forename: Takafumi
authors.initials: T
authors.lastname: Fuchimoto
authors.forename: Akira
authors.initials: A
authors.lastname: Ito
mesh_terms: D000704:Analysis of Variance; D001484:Baseball / Q000502:physiology; D004576:Electromyography; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D013909:Thorax / Q000502:physiology*; D019415:Torque; D055815:Young Adult