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Nutrition

甜菜碱在14天内提升卧推抛掷功率约16%

Dr. Gymbro · · 1 min read
#betaine #supplements #ergogenic aids #strength #bench press #research #power

甜菜碱在14天内提升卧推抛掷功率约16%

两周的甜菜碱（TMG）补充与约 16% 的卧推抛掷功率提升相关——这是 2010 年针对阻力训练男性的交叉试验的主要结论。结果虽有趣，但解读时需结合实验前提；受益最大的往往是上身训练者。

什么是甜菜碱（TMG）？

甜菜碱，又称三甲基甘氨酸（TMG），自然存在于甜菜、菠菜、小麦等食材中，也可制成单独的膳食补充剂。长期以来，甜菜碱在运动营养圈被视为潜在的增效剂。Lee 等人在《甜菜碱补充对力量和功率表现的增效作用》一文中，对其在力量和功率上的影响进行了系统检验（2010，J Int Soc Sports Nutr.）。

研究设计

  • 受试者：12 名男性（平均 21±3 岁，体重 79.1±10.7 kg），均有 ≥3 个月的阻力训练经验。
  • 试验设计：平衡、随机、双盲、交叉。每位受试者分别完成两段 14 天的干预——一次服用甜菜碱，另一次服用安慰剂，两段之间设 14 天洗脱期。
  • 测试流程：每段干预的前后，受试者在连续两天（D1、D2）进行标准化高强度力量/功率测试，项目包括卧推、深蹲和垂直跳。交叉设计使每位受试者既是实验组也是对照组，能够有效抵消个体差异的干扰；两天连续测试则帮助观察在累积疲劳下成绩的维持情况。

主要结果

卧推抛掷功率

条件 D1 (W) D2 (W)
基线 1534±30 1498±29
甜菜碱 1779±90 1788±34
安慰剂 1374±128 1523±39
  • D1 相比基线提升约 16%，D2 提升约 19%（均 p<0.05）。

等长卧推力量

条件 D1 (N) D2 (N)
基线 2345 2423
甜菜碱 2922±297 2503±28
安慰剂 2175 2128
  • D1 的提升幅度最为显著，D2 较基线的增益稍小，提示力量收益在干预首日更为突出。

下肢指标

  • 垂直跳功率和等长深蹲力量在两天均有小幅提升，但相对卧推的效果要弱得多。

未出现改善的项目

  • 跳深功率、卧推/深蹲的重复次数 均未出现显著变化。对追求在同一负荷下完成更多次数的举重者而言，这一点尤为重要——甜菜碱的效应限于功率和最大力量，而非重复耐力。

剂量与服用时机

  • 受试者每日分 两次 各摄入 1.25 g 甜菜碱（合计 2.5 g/天），混入运动饮料，连续服用 14 天。这是一种中等剂量的持续补充方案，而非一次性“预训练冲剂”。

研究局限与注意事项

  • 样本量仅 12 人，且全部为 年轻男性；结果不一定适用于女性、年长者、精英运动员或更长训练周期。
  • 部分指标的标准差异常偏小，可能低估了个体差异。
  • 该试验测的是短期测试环境下的表现提升，而非长期的肌肉或力量增长。

对举重者的实际建议

  1. 关注功率而非重复次数。本研究显示甜菜碱提升的是卧推抛掷功率和等长最大力量。
  2. 上身肌群受益更明显。效果在较小的上身肌肉上更为显著。
  3. 若尝试，请遵循相同方案：每天两次、每次 1.25 g（总计 2.5 g），混入饮料，持续 14 天。
  4. 保持现实预期。单一小样本交叉试验只能作为探索性证据，训练、睡眠、营养仍是决定成绩的关键因素。

参考文献

Lee EC, et al. Ergogenic effects of betaine supplementation on strength and power performance. J Int Soc Sports Nutr. 2010;7:27. DOI: https://doi.org/10.1186/1550-2783-7-27. PubMed: https://pubmed.ncbi.nlm.nih.gov/20642826/.

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

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