Iglay H B, Apolzan J W, Gerrard D E, Eash J K, Anderson J C, Campbell W W
Department of Foods and Nutrition, Purdue University, 700 West State Street, West Lafayette, IN 47907-2059, USA.
J Nutr Health Aging. 2009 Feb;13(2):108-14. doi: 10.1007/s12603-009-0016-y.
The effects of increased dietary protein on resistance training (RT)-induced changes in body composition and skeletal muscle fiber size are uncertain in older people.
We hypothesized that the ingestion of more animal-based foods, especially eggs, to achieve a higher protein intake would enhance RT-induced changes in body composition.
West Lafayette, IN.
36 older people (age 61 +/- 1 y; mean +/- SEM).
Subjects completed RT three d/wk for 12 weeks, and consumed omnivorous diets that contained either 0.9 +/- 0.1 (lower protein) or 1.2 +/- 0.0 (higher protein) g protein x kg(-1) x d(-1) (12 +/- 3 and 17 +/- 5% of energy intakes, respectively), with the higher protein intake achieved by consuming more eggs, meats, and dairy foods. The lower and higher protein diets contained 213 +/- 21 and 610 +/- 105 mg cholesterol/d, respectively.
Strength, body composition, serum lipid-lipoprotein profile, urinary creatinine, skeletal muscle fiber type and size.
Among all subjects, over time (i.e. with RT) body weight was unchanged, lean mass (1.1 +/- 0.2 kg) increased, and fat mass (-1.4 +/- 0.2 kg) decreased (all changes P < 0.05). Regional (i.e. trunk, legs, arms) lean mass increased and fat mass decreased. Whole body muscle mass (24-h urinary creatinine excretion) increased, but skeletal muscle (vastus lateralis) type 1, type 2a, and type 2x fiber cross-sectional areas did not change from baseline. Serum total and LDL cholesterol decreased (P < 0.05) and HDL cholesterol and triacylglycerol were unchanged. Dietary protein and cholesterol intakes did not influence these responses to RT.
Consumption of diets that contained moderately higher protein and variable amounts of cholesterol did not differentially affect body composition, skeletal muscle fiber size, or serum lipid-lipoprotein profile responses to resistance training in older people.
在老年人中，增加膳食蛋白质对阻力训练（RT）诱导的身体成分和骨骼肌纤维大小变化的影响尚不确定。
我们假设摄入更多以动物为主的食物，尤其是鸡蛋，以实现更高的蛋白质摄入量，会增强RT诱导的身体成分变化。
印第安纳州西拉斐特。
36名老年人（年龄61±1岁；平均值±标准误）。
受试者每周进行3天的RT训练，为期12周，并食用杂食性饮食，其中蛋白质含量为0.9±0.1（低蛋白）或1.2±0.0（高蛋白）克蛋白质×千克⁻¹×天⁻¹（分别占能量摄入的12±3%和17±5%），通过食用更多鸡蛋、肉类和乳制品来实现更高的蛋白质摄入量。低蛋白和高蛋白饮食分别含有213±21和610±105毫克胆固醇/天。
力量、身体成分、血清脂质-脂蛋白谱、尿肌酐、骨骼肌纤维类型和大小。
在所有受试者中，随着时间推移（即进行RT训练），体重不变，瘦体重（1.1±0.2千克）增加，脂肪量（-1.4±0.2千克）减少（所有变化P<0.05）。局部（即躯干、腿部、手臂）瘦体重增加，脂肪量减少。全身肌肉量（24小时尿肌酐排泄量）增加，但骨骼肌（股外侧肌）1型、2a型和2x型纤维横截面积与基线相比没有变化。血清总胆固醇和低密度脂蛋白胆固醇降低（P<0.05），高密度脂蛋白胆固醇和甘油三酯不变。膳食蛋白质和胆固醇摄入量并未影响这些对RT训练的反应。
食用蛋白质含量适度较高且胆固醇含量不同的饮食，对老年人阻力训练后的身体成分、骨骼肌纤维大小或血清脂质-脂蛋白谱反应没有差异影响。
