更高的蛋白质摄入量强调瘦牛肉不会影响阻力训练诱导的适应在老年妇女的骨肌肉和肌:一个随机控制养试验
Chad C Carroll1, Nathan Wc Campbell1, Rebecca L Lewis1
1Department of Health and Kinesiology, Purdue University, West Lafayette, IN, United States.
The Journal of nutrition
|April 11, 2024
概括
较高的蛋白质摄入量,特别是来自牛肉的蛋白质摄入量,并没有增强抵抗训练对老年女性肌肉或肌力量的益处. 需要进一步的研究来了解蛋白质.
科学领域:
- 老年学是指老年学的学科.
- 运动生理学 运动生理学
- 营养科学 营养科学
背景情况:
- 抵抗训练 (RT) 和足够的蛋白质摄入量对于维持老年人肌肉质量和力量至关重要.
- 专门研究蛋白质摄入对肌适应RT的影响的研究在这个人群中是有限的.
研究的目的:
- 调查蛋白质丰富的饮食,强调瘦牛肉,对抗力训练诱导的骨肌肉和肌大小和力量的变化对老年女性的影响.
- 为了比较高蛋白饮食 (1.4 g/kg/d) 含牛肉与高蛋白饮食 (1.4 g/kg/d) 来自混合来源和正常蛋白质饮食 (0.8 g/kg/d) 的结果.
主要方法:
- 老年妇女被随机分为三个饮食组:正常蛋白质 (0.8 g/kg/d),高蛋白质 (1.4 g/kg/d) 或高蛋白质强调瘦牛肉 (1.4 g/kg/d).
- 所有参与者都接受了为期12周的耐力训练计划 (每周3次).
- 使用MRI评估肌肉体积,并通过超声波和MRI测量状肌特性 (横截面积和生物力学).
主要成果:
- 抵抗训练显著增加四头肌强度和肌肉体积,独立于饮食中的蛋白质摄入量.
- 虽然RT观察到平均肌截面积 (CSA) 增加的趋势,但在饮食组中没有发现显著差异.
- 特定的肌区域对RT的反应有所不同,CSA的反应有所增加,但整体生物力学特性保持不变.
结论:
- 增加每日蛋白质摄入量,即使是强调瘦牛肉,也没有显著提高抵抗训练诱导的老年女性肌肉力量或体积的改善.
- 该研究发现,高蛋白或以牛肉为中心的饮食对肌结果没有统计学上显著的影响,尽管在肌CSA中观察到一些趋势.
- 这些发现表明,虽然RT对老年女性的肌肉适应有效,但特定的饮食蛋白质策略,包括牛肉重点,可能不会在本研究的参数内提供额外的肌益处.
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