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Open AccessArticle

Potato Protein Isolate Stimulates Muscle Protein Synthesis at Rest and with Resistance Exercise in Young Women

1
Department of Kinesiology, McMaster University, Hamilton, ON L8S 4L8, Canada
2
Faculty of Applied Health & Community Studies, Sheridan College, Brampton, ON L6Y 5H9, Canada
3
School of Kinesiology and Health Studies, Queens University, Kingston, ON K7L 3N6, Canada
4
Department of Neurology, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON L8S 4K1, Canada
*
Author to whom correspondence should be addressed.
Nutrients 2020, 12(5), 1235; https://doi.org/10.3390/nu12051235
Received: 2 April 2020 / Revised: 15 April 2020 / Accepted: 23 April 2020 / Published: 27 April 2020
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, n = 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 (p = 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. View Full-Text
Keywords: muscle protein synthesis; resistance exercise; potato protein muscle protein synthesis; resistance exercise; potato protein
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Oikawa, S.Y.; Bahniwal, R.; Holloway, T.M.; Lim, C.; McLeod, J.C.; McGlory, C.; Baker, S.K.; Phillips, S.M. Potato Protein Isolate Stimulates Muscle Protein Synthesis at Rest and with Resistance Exercise in Young Women. Nutrients 2020, 12, 1235.

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