Athletes involved in contact sports are habitually exposed to skeletal-muscle damage in their training and performance environments. This often leads to exercise-induced muscle damage (EIMD) resulting from repeated eccentric and/or high-intensity exercise and to impact-induced muscle damage (IIMD) resulting from collisions with opponents and the playing surface. While EIMD has been an area of extensive investigation, IIMD has received comparatively little research, with the magnitude and time frame of alterations following IIMD not presently well understood. It is currently thought that EIMD results from an overload of mechanical stress that causes ultrastructural damage to the cellular membrane constituents. Damage leads to compromised ability to produce force, which manifests immediately and persists for up to 14 d following exercise exposure. IIMD has been implicated in attenuated neuromuscular performance and recovery and in inflammatory processes, although the underlying course over time remains unclear. Exposure to EIMD leads to an adaptation to subsequent exposures, a phenomenon known as the repeated-bout effect. An analogous adaptation has been suggested to occur following IIMD; however, to date, this contention remains equivocal. While a considerable body of research has explored the efficacy of recovery strategies following EIMD, strategies promoting recovery from IIMD are limited to investigations using animal contusion models. Strategies such as cryotherapy and antioxidant supplementation that focus on attenuating the secondary inflammatory response may provide additional benefit in IIMD and are explored herein. Further research is required to first establish a model of generating IIMD and then explore broader areas around IIMD in athletic populations.

译文

:从事接触式运动的运动员在其训练和表演环境中习惯性地受到骨骼肌损伤的影响。这经常导致由于反复的离心运动和/或高强度运动而引起的运动引起的肌肉损伤(EIMD),以及由于与对手和比赛场地的碰撞而引起的冲击引起的肌肉损伤(IIMD)。尽管EIMD已成为广泛研究的领域,但IIMD的研究相对较少,IIMD发生变化的程度和时间框架目前尚不为人所知。目前认为,EIMD是由机械应力的超载引起的,该机械应力对细胞膜成分造成超微结构损伤。伤害会导致产生力量的能力受损,这种能力会立即显现出来,并在运动暴露后持续长达14天。尽管尚不清楚随着时间的推移,IIMD与神经肌肉功能减退和恢复以及炎症过程有关。暴露于EIMD会导致适应随后的暴露,这种现象称为重复回合效应。有人建议在IIMD之后进行类似的修改。但是,迄今为止,这种争论仍然是模棱两可的。尽管有大量研究探索了EIMD后恢复策略的功效,但促进IIMD恢复的策略仅限于使用动物挫伤模型进行的研究。专注于减轻继发性炎症反应的诸如冷冻疗法和抗氧化剂补充的策略可以在IIMD中提供额外的益处,并且在本文中进行了探讨。首先需要建立IIMD产生模型,然后在运动人群中探索IIMD周围更广阔的区域,这需要进一步的研究。

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