蛋白质数量和分布对人体成分的影响
1Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL, United States.
Frontiers in nutrition
|May 20, 2024
概括
在老年人中优化肌肉质量需要了解蛋白质摄入量. 食物中的白刺激肌肉蛋白合成 (MPS),特别是在老年人中,但长期影响需要更多的研究.
科学领域:
- 营养科学 营养科学
- 老年学是指老年学的学科.
- 肌肉生理学 肌肉生理学
背景情况:
- 衰老与肌肉质量丧失和蛋白质合成减少有关.
- 氨酸是一种分支链氨基酸,作为一种代谢信号,启动肌肉蛋白质合成 (MPS).
- 与年轻人相比,老年人需要更高的白摄入量来刺激MPS.
研究的目的:
- 为了研究饮食蛋白质在优化肌肉质量和身体构成中的食分配的作用.
- 为了探索白对老年人肌肉蛋白质合成的影响.
- 检查减肥期间节省蛋白质概念的有效性.
主要方法:
- 对蛋白质摄入量,白蛋白值和MPS的临床研究的审查.
- 用餐分配原理应用于在代谢条件下节省蛋白质.
- 对MPS对食蛋白质反应的年龄相关差异的分析.
主要成果:
- 老年人 (>60岁) 需要每餐至少2.8g白 (~30g蛋白质) 来刺激MPS.
- 年轻的成年人 (<30岁) 显示出对食蛋白质含量的线性MPS反应.
- 餐食分配策略可以增强禁食后的MPS,并在减肥期间储备瘦肉量.
结论:
- 虽然蛋白质和白素的MPS刺激已经确立,但老化过程中对肌肉质量的长期影响是推测性的.
- 足够的蛋白质摄入量可以保持MPS响应的能力在老年人中.
- 使用餐点分配的蛋白质节约概念表明,保持瘦体质量是有希望的.
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