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Nutrition

每日6克D-天冬氨酸降低受训举重者的睾酮水平

Dr. Gymbro · · 1 min read
#supplements #hormones #resistance training #creatine #d aspartic acid #testosterone booster #daa dosage

你买它是想提升睾酮水平，却在受训举重者的对照试验中发现，高剂量反而产生了相反的效果。

研究人员发现 每日摄入6克D-天冬氨酸（DAA）会降低总睾酮和游离睾酮，而大多数“睾酮助推”标签上标示的3克剂量则没有任何可测量的效应。如果你曾搜索过 "D-天冬氨酸是否有效"、"D-天冬氨酸剂量"、"DAA 睾酮助推剂"，这篇研究值得你仔细阅读。

D-天冬氨酸是什么，为什么会出现在睾酮助推产品里？

D-天冬氨酸是一种参与激素信号传导的氨基酸。动物实验曾显示，它可以刺激大脑中的促性腺激素释放并促进睾丸睾酮合成。补剂制造商便把这些动物实验结果直接搬到产品宣传上。

在人类中的最早证据来源于2009年一项针对久坐男性的研究（Topo 等），该研究报告称，约 3.12 g/天、持续12天 后，血清睾酮水平提升约42%。这让DAA获得了 “天然睾酮助推剂” 的美称，也解释了为何市面上很多产品把剂量设在3克左右。

然而，这里存在一个盲点——大多数购买DAA的人并非久坐，而是有举重或其他阻力训练习惯的群体。以往在受训男性中的研究已经显示，DAA并未带来显著的睾酮变化。于是本研究的作者想弄清楚，经验丰富的举重者是否需要更高剂量才能看到效果。

研究概览：24名受训男性、14天、三组对照

Melville、Siegler 与 Marshall 于2015年在 Journal of the International Society of Sports Nutrition 发表了一项随机、安慰剂对照试验。

  • 受试者：24名拥有至少两年阻力训练经验的男性（平均年龄约24.5岁，卧推 1RM≈105 kg）
  • 分组：安慰剂（6 g 普通面粉）、每日3 g DAA、每日6 g DAA
  • 时长：两周洗脱期后，连续14天每天早晨服用
  • 训练情况：整个实验期间，每周四次阻力训练
  • 检测指标：总睾酮、雌二醇、性激素结合球蛋白（SHBG）、白蛋白以及计算得到的游离睾酮

每组约8人，样本量偏小，解读结果时请牢记这一点。

结果简明回顾

6 g/天降低了睾酮

  • 6 g 组的总睾酮显著下降（P = 0.03），游离睾酮也较安慰剂显著降低（P = 0.005）。
  • P 值反映的是若补剂根本无效时出现该差异的概率。P = 0.03 意味着随机情况下仅有约3/100 的几率出现这种差异；P = 0.005 则约为5/1000。两者均低于常用的0.05阈值，说明下降不太可能是偶然噪声，尽管小样本仍可能导致误判。

3 g/天没有效果

  • 3 g 组在总睾酮和游离睾酮两项指标上均未显示出与安慰剂的显著差异。

其他指标未见变化

  • 雌二醇、SHBG、白蛋白均保持不变。基线睾酮水平也未能预测谁会产生响应（r = 0.10，P = 0.70），即起始睾酮较低的受试者并不更容易受益。

为何受训男性的反应可能不同？

研究本身并未给出明确原因，但以下解释相对合理：

  1. 起始状态不同——久坐者与长期训练者在下丘脑‑垂体‑性腺轴的调节上可能存在差异，同样的信号在两类人群中可能被缓冲甚至逆转。
  2. 潜在负反馈——过度刺激某条激素通路可能触发补偿性抑制。高剂量的信号氨基酸可能抑制而非提升睾酮分泌。这仅为推测，试验并未直接验证。
  3. 训练本身已是刺激——每周四次的阻力训练已经为体内激素系统提供了显著刺激，额外补剂的提升空间有限。
  4. 样本量小——正面结果与本负面结果都来自小规模实验，部分分歧可能是统计噪声。

后续研究：三个月未见力量或肌肉优势

同一研究团队随后在2017年（Melville 等，PLoS One）进行了一项为期三个月的随机对照试验，受试者同样为受训男性，摄入6 g/天的DAA。结果显示，DAA并未在力量或肌肉增长上优于安慰剂。该发现重要，因为2015年的论文仅测量了激素，未能说明睾酮下降是否会影响力量和肥大。更长时间的试验未发现任何性能提升，使得 “剂量越大越好” 的说法缺乏依据。

局限性

  • 样本量小：每组约8人
  • 试验时长短：仅14天（后续三个月试验虽长，但仍未测力量/体积）
  • 仅测激素：未记录力量、肌肉体积或实际表现
  • 单次抽血：睾酮日间波动大，一次测量只能提供有限快照
  • 特定人群：年轻、受训男性，结果未必适用于年长者或临床低睾酮人群

该研究并未证明DAA长期使用有害，只是表明在受训男性中既无提升迹象，且高剂量可能出现相反效果。

实际建议

  1. 别把 “多即好” 当作原则。6 g 剂量是导致睾酮下降的那一档。仅因为感觉 “没效果” 就盲目加量并不可取。
  2. 核对标签。许多睾酮助推剂每份含 3 g 或更多 DAA，并且常与其他成分叠加，导致每日摄入量迅速累计。务必查看每份的含量以及实际服用次数。
  3. 谁还能考虑尝试？ 依据现有证据，受训举重者几乎没有理由期待收益。久坐者或已获临床建议的低睾酮患者或许另当别论，但相关数据仍然有限。若担心睾酮偏低，最好先做血液检查并接受专业医疗指导，而不是靠补剂猜测。
  4. 把钱花在有证据支持的东西上。对提升训练表现，肌酸单体的研究支持力度远超 DAA。系统的渐进训练、充足的蛋白质摄入、足够的热量以及良好睡眠，对激素环境和训练结果的帮助远大于 DAA。

结论

DAA 对受训举重者有效吗？本试验显示，3 g/天毫无作用，6 g/天则降低总睾酮和游离睾酮。随后进行的三个月试验同样未发现力量或肌肉方面的优势。研究样本小、时长短，但整体趋势并不支持 DAA 作为已在训练人群的睾酮助推剂。

Original study

Read the original research on pubmed.ncbi.nlm.nih.gov →

This article summarizes published research for general information. It is not medical advice.

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Dr. Gymbro

Dr. Gymbro writes for Dr. Gymbro: science-backed fitness, nutrition & performance.

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