Chronological changes in neuromuscular cooperativeness before and after muscle fatigue loading using the silent period of the quadriceps and hamstrings in young female athletes

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  • Ito-Oonishi Sakiko
    Department of Physical Therapy, School of Health Sciences, Tokyo University of Technology: 5-23-22 Nishikamata, Ota-ku, Tokyo 144-8535, Japan Faculty of Sport and Health Science, University of Tsukuba, Japan
  • Takemura Masahiro
    Faculty of Sport and Health Science, University of Tsukuba, Japan
  • Kanamori Akihiro
    Faculty of Sport and Health Science, University of Tsukuba, Japan
  • Kusumoto Yasuaki
    Department of Physical Therapy, Fukushima Medical University School of Health Sciences, Japan
  • Miyakawa Shumpei
    Faculty of Sport and Health Science, University of Tsukuba, Japan

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<p> [Purpose] Understanding the neuromuscular cooperativeness functions when an athlete is fatigued is essential in preventing sports injuries and examining post-injury return standards. This study aimed to investigate the kinds of changes in neuromuscular cooperativeness before and after fatigue loading. [Participants and Methods] Fifteen female university athletes were examined for chronological changes in neuromuscular cooperativeness. Muscle fatigue loading was performed using BIODEX (180°/s) during knee flexion and extension exercises on one side. Surface electromyography of the rectus femoris and biceps femoris was performed on both sides before and immediately, 5 min, 10 min, and 15 min after loading. The switching silent period and pre-motor time were calculated from the electromyographic waveforms to indicate neuromuscular cooperativeness. [Results] The switching silent periods in the loading side immediately and 5 min after loading were significantly prolonged compared with that before loading. [Conclusion] Muscle fatigue loading instantaneously prolonged the switching silent period and decreased the neuromuscular cooperativeness. Furthermore, recovery generally occurred within 10 minutes after loading.</p>

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