Oxidation damages cells and muscles, and thus, causes injuries and fatigue, which negatively affect the conditioning of athletes. Thus, in this study, we aimed to investigate the effects of high-antioxidant fruits (kiwifruit) intake on oxidative stress level (d-ROMs) and antioxidant activity (BAP) in male middle- and long-distance runners routinely exposed to oxidative stress. This study was performed from May to July 2017 (Study 1) and October to December 2018 (Study 2). The subjects in Study 1 were 30 male runners, of which 15 consumed two yellow kiwifruits (Zespri® SunGold Kiwifruit) per day for one month of the survey period (Intake group). The subjects of Study 2 were 20 male runners who had high d-ROMs from preliminary testing. These runners consumed two yellow kiwifruits (Zespri® SunGold Kiwifruit) per day for two months. d-ROMs and BAP were measured using a free radical analyzer. In study 1, the d-ROMs decreased while the potential antioxidant capacity (BAP/d-ROMs ratio) increased in the Intake group. In study 2, BAP/d-ROMs ratio was higher after one and two months compared to that at pre-intervention. Study findings suggested that consumption of kiwifruits may reduce oxidative stress levels and increase antioxidant activity, resulting in improved potential antioxidant capacity.

中文翻译：

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摄入猕猴桃可提高日本例行暴露于氧化应激的中长跑男子的潜在抗氧化能力

氧化会损害细胞和肌肉，从而导致受伤和疲劳，对运动员的身体状况造成负面影响。因此，在本研究中，我们旨在研究摄入高抗氧化剂水果（猕猴桃）对常规暴露于氧化应激的男性中长跑运动员的氧化应激水平（d-ROM）和抗氧化活性（BAP）的影响。这项研究于2017年5月至7月（研究1）和2018年10月至2018年12月（研究2）进行。研究1的受试者为30名男性跑步者，其中15名在调查期间的一个月内（摄入组）每天食用两种黄色奇异果（Zespri®SunGold奇异果）。研究2的受试者为20位男性选手，他们从初步测试中获得了较高的d-ROM。这些跑步者每天食用两个黄色的奇异果（Zespri®SunGold奇异果），持续两个月。使用自由基分析仪测量d-ROM和BAP。在研究1中，摄入组中d-ROM减少，而潜在的抗氧化能力（BAP / d-ROMs比）增加。在研究2中，与干预前相比，BAP / d-ROMs的比率在1和2个月后更高。研究结果表明，食用奇异果可以降低氧化应激水平并增加抗氧化活性，从而提高潜在的抗氧化能力。