Department of Kinesiology, McMaster University, Hamilton, ON L8S 4L8, Canada.
Faculty of Applied Health & Community Studies, Sheridan College, Brampton, L6Y 5H9, Canada.
Nutrients. 2020 Apr 27;12(5):1235. doi: 10.3390/nu12051235.
Skeletal muscle myofibrillar protein synthesis (MPS) increases in response to protein feeding and to resistance exercise (RE), where each stimuli acts synergistically when combined. The efficacy of plant proteins such as potato protein (PP) isolate to stimulate MPS is unknown. We aimed to determine the effects of PP ingestion on daily MPS with and without RE in healthy women. In a single blind, parallel-group design, 24 young women (21 ± 3 years, = 12/group) consumed a weight-maintaining baseline diet containing 0.8 g/kg/d of protein before being randomized to consume either 25 g of PP twice daily (1.6 g/kg/d total protein) or a control diet (CON) (0.8 g/kg/d total protein) for 2 wks. Unilateral RE (~30% of maximal strength to failure) was performed thrice weekly with the opposite limb serving as a non-exercised control (Rest). MPS was measured by deuterated water ingestion at baseline, following supplementation (Rest), and following supplementation + RE (Exercise). Ingestion of PP stimulated MPS by 0.14 ± 0.09 %/d at Rest, and by 0.32 ± 0.14 %/d in the Exercise limb. MPS was significantly elevated by 0.20 ± 0.11 %/d in the Exercise limb in CON ( = 0.008). Consuming PP to increase protein intake to levels twice the recommended dietary allowance for protein augmented rates of MPS. Performance of RE stimulated MPS regardless of protein intake. PP is a high-quality, plant-based protein supplement that augments MPS at rest and following RE in healthy young women.
骨骼肌肌球蛋白合成（MPS）会响应蛋白质喂养和抗阻运动（RE）而增加，这两种刺激因素结合时会产生协同作用。植物蛋白（如马铃薯蛋白[PP]分离物）刺激 MPS 的效果尚不清楚。我们旨在确定 PP 摄入对健康女性在进行 RE 和不进行 RE 时的每日 MPS 的影响。在一项单盲、平行组设计中，24 名年轻女性（21±3 岁，n=12/组）在摄入维持体重的基础饮食之前，先摄入 0.8 g/kg/d 的蛋白质，该饮食中含有 0.8 g/kg/d 的总蛋白，然后随机分为两组，分别每天摄入 25 g 的 PP（总蛋白 1.6 g/kg/d）或对照饮食（CON）（总蛋白 0.8 g/kg/d）2 周。每周进行 3 次单侧 RE（最大力量的 30%至力竭），另一侧肢体作为非运动对照（Rest）。通过氘水摄入在基线、补充后（Rest）和补充后+RE（Exercise）时测量 MPS。PP 的摄入使 Rest 时的 MPS 增加了 0.14±0.09%/d，使 Exercise 侧的 MPS 增加了 0.32±0.14%/d。CON 中 Exercise 侧的 MPS 增加了 0.20±0.11%/d（ = 0.008）。通过摄入 PP 将蛋白质摄入量增加到推荐膳食允许量的两倍以上，可以提高 MPS 率。进行 RE 无论蛋白质摄入量如何，都会刺激 MPS。PP 是一种高质量的植物性蛋白质补充剂，可在健康年轻女性休息时和进行 RE 后增加 MPS。
