Does the repeated bout effect of eccentric contraction also protect nerve function?

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K19485
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 59020:Sports sciences-related
• Research Institution: Teikyo Heisei University
• Principal Investigator: UEDA Hisashi 帝京平成大学, 健康医療スポーツ学部, 講師 (10791775)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 神経損傷 / 運動神経伝導速度 / 感覚神経伝導速度

Outline of Final Research Achievements

The purpose of this study was to investigate the contralateral (CL-RBE) and ipsilateral (IL-RBE) repeated bout effects in motor and sensory nerve conduction velocity (SCV) for flexor pollicis brevis muscle after eccentric contractions (ECCs). A total of 32 young healthy men were recruited for this study. The subjects performed the two bouts of ECCs. At first bout, ECCs of 1st session (ECCs-1st: n = 32), all subjects were randomly selected ECCs hand or non-exercise hand (either dominant or non-dominant hand). At second bout, three groups (2W- interval: n = 11, 4W-interval: n = 10, 8W-interval: n = 11) performed ECCs on the IL-RBE and CL-RBE respectively 2, 4, or 8 weeks after ECCs-1st. The present study showed that ECCs of the FPBM cause a significant delay in SCV. However, the repeated bout effects on nerve conduction velocity were not significantly different in all interval condition groups.

Free Research Field

スポーツ科学関連

Academic Significance and Societal Importance of the Research Achievements

本研究では、繰り返し効果および対側繰り返し効果について、神経科学的な観点（神経伝導速度）でメカニズムを解明するという点において独自性を有している。また、短母指屈筋は、神経伝導速度の測定が容易な正中神経に支配されているため、伸張性収縮が支配神経に与える影響を検討するのに最適なモデルである。伸張性収縮に伴う筋および神経損傷は、スポーツ現場で頻繁に観察される遅発性筋痛や肉離れ損傷の現象との関連性が指摘されているため、伸張性収縮が筋および神経に与える影響を理解することは、伸張性収縮を取り入れた運動療法の新規プログラム開拓に寄与できると考える。