Faculty of Physical Education and Sport Sciences, University of Tehran, Tehran, Iran.
Biol Trace Elem Res. 2011 Dec;144(1-3):454-62. doi: 10.1007/s12011-011-9138-2. Epub 2011 Jul 9.
Zinc and selenium are essential minerals and have roles for more than 300 metabolic reactions in the body. The purpose of this study was to investigate how exhaustive exercise affects testosterone levels and plasma lactate in cyclists who were supplemented with oral zinc and selenium for 4 weeks. For this reason, 32 male road cyclists were selected equally to four groups: PL group, placebo; Zn group, zinc supplement (30 mg/day); Se group, selenium supplement (200 μg/day); and Zn-Se group, zinc-selenium supplement. After treatment, free, total testosterone, and lactate levels of subjects were determined before and after exhaustive exercise. Resting total, free testosterone, and lactate levels did not differ significantly between groups, and were increased by exercise (P > 0.05). Serum total testosterone levels in Zn group were higher than in Se group after exercise (P < 0.05). Serum-free testosterone levels in the Zn group were higher than the other groups (P < 0.05).There was an insignificant difference between levels of lactate in the four groups after exercise (P > 0.05). The results showed that 4-week simultaneous and separately zinc and selenium supplementation had no significant effect on resting testosterone and lactate levels of subjects who consume a zinc and selenium sufficient diet. It might be possible that the effect of zinc supplementation on free testosterone depends on exercise.
锌和硒是必需的矿物质，在体内参与超过 300 种代谢反应。本研究旨在探讨补充锌和硒 4 周对进行力竭性运动的自行车运动员的睾酮水平和血浆乳酸的影响。为此，选择了 32 名男性公路自行车运动员，平均分为 4 组：PL 组，安慰剂；Zn 组，锌补充剂（30mg/天）；Se 组，硒补充剂（200μg/天）；Zn-Se 组，锌硒补充剂。治疗后，在力竭性运动前后测定受试者的游离、总睾酮和乳酸水平。休息时，各组的总睾酮、游离睾酮和乳酸水平差异无统计学意义，运动后均升高（P＞0.05）。运动后 Zn 组的血清总睾酮水平高于 Se 组（P＜0.05）。Zn 组的血清游离睾酮水平高于其他组（P＜0.05）。运动后 4 组的乳酸水平差异无统计学意义（P＞0.05）。结果表明，在摄入锌和硒充足的饮食的受试者中，4 周同时或分别补充锌和硒对静息状态下的睾酮和乳酸水平没有显著影响。锌补充对游离睾酮的影响可能取决于运动。
