TODENTJ-25-03-2019_TODENTJ-10-474 1553506643 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 08 31 2016 10 1 Hideyuki Nukaga Tomotaka Takeda Kazunori Nakajima Keishiro Narimatsu Takamitsu Ozawa Keiichi Ishigami Kazuo Funato Teeth clenching has been shown to improve remote muscle activity (by augmentation of the Hoffmann reflex), and joint fixation (by decreased reciprocal inhibition) in the entire body. Clenching could help maintain balance, improve systemic function, and enhance safety. Teeth clenching from a sports dentistry viewpoint was thought to be important and challenging. Therefore, it is quite important to investigate mastication muscles’ activity and function during sports events for clarifying a physiological role of the mastication muscle itself and involvement of mastication muscle function in whole body movement. Running is a basic motion of a lot of sports; however, a mastication muscles activity during this motion was not clarified. Throwing and jumping operation were in a same situation. The purpose of this study was to investigate the presence or absence of masseter muscle activity during track and field events. In total, 28 track and field athletes took part in the study. The Multichannel Telemetry system was used to monitor muscle activity, and the electromyograms obtained were synchronized with digital video imaging. The masseter muscle activity threshold was set 15% of maximum voluntary clenching. As results, with few exceptions, masseter muscle activity were observed during all analyzed phases of the 5 activities, and that phases in which most participants showed masseter muscle activity were characterized by initial acceleration, such as in the short sprint, from the commencement of throwing to release in both the javelin throw and shot put, and at the take-off and landing phases in both jumps. 08 31 2016 474 485 TODENTJ-10-474 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2015-6-9 2016-6-3 2016-06-29 2016-08-31 https://creativecommons.org/licenses/by/4.0/legalcode 10.2174/1874210601610010474 1553506643 https://opendentistryjournal.com/VOLUME/10/PAGE/474/ https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-474/TODENTJ-10-474.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-474/TODENTJ-10-474.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-474/TODENTJ-10-474.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-474/TODENTJ-10-474.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-474/TODENTJ-10-474.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-474/TODENTJ-10-474.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-474/TODENTJ-10-474.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-474/TODENTJ-10-474.xml Kure Kyosai Hospital Ohkawa S. 46 34 1997 Ohkawa S. 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