Cited by 119Muscle metabolism and nutritionNutrition and Health in AgingMuscle Physiology and Disorders

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Whey Protein Supplementation Preserves Postprandial Myofibrillar Protein Synthesis during Short-Term Energy Restriction in Overweight and Obese Adults

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Hector, Amy J, Marcotte, George R, Churchward-Venne, Tyler A, Murphy, Caoileann H, Breen, Leigh, von Allmen, Mark, Baker, Steven K, Phillips, Stuart M·2015·The Journal of Nutrition

Abstract

Background Higher dietary energy as protein during weight loss results in a greater loss of fat mass and retention of muscle mass; however, the impact of protein quality on the rates of myofibrillar protein synthesis (MPS) and lipolysis, processes that are important in the maintenance of muscle and loss of fat, respectively, are unknown.Objective We aimed to determine how the consumption of different sources of proteins (soy or whey) during a controlled short-term (14-d) hypoenergetic diet affected MPS and lipolysis.Methods Men (n = 19) and women (n = 21) (age 35-65 y; body mass index 28-50 kg/m(2)) completed a 14-d controlled hypoenergetic diet (-750 kcal/d). Participants were randomly assigned, double blind, to receive twice-daily supplements of isolated whey (27 g/supplement) or soy (26 g/supplement), providing a total protein intake of 1.3 ± 0.1 g/(kg · d), or isoenergetic carbohydrate (25 g maltodextrin/supplement) resulting in a total protein intake of 0.7 ± 0.1 g/(kg · d). Before and after the dietary intervention, primed continuous infusions of L-[ring-(13)C6] phenylalanine and [(2)H5]-glycerol were used to measure postabsorptive and postprandial rates of MPS and lipolysis.Results Preintervention, MPS was stimulated more (P < 0.05) with ingestion of whey than with soy or carbohydrate. Postintervention, postabsorptive MPS decreased similarly in all groups (all P < 0.05). Postprandial MPS was reduced by 9 ± 1% in the whey group, which was less (P < 0.05) than the reduction in soy and carbohydrate groups (28 ± 5% and 31 ± 5%, respectively; both P < 0.05) after the intervention. Lipolysis was suppressed during the postprandial period (P < 0.05), but more so with ingestion of carbohydrate (P < 0.05) than soy or whey.Conclusion We conclude that whey protein supplementation attenuated the decline in postprandial rates of MPS after weight loss, which may be of importance in the preservation of lean mass during longer-term weight loss interventions. This trial was registered at clinicaltrials.gov as NCT01530646.

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Authors
Hector, A. J., Marcotte, G. R., Churchward-Venne, T. A., Murphy, C. H., Breen, L., von Allmen, M., Baker, S. K., & Phillips, S. M.
Affiliations
  • University of Birmingham (GB)
  • McMaster University (CA)
Corresponding author
Phillips, Stuart M
Venue
The Journal of Nutrition
Publisher
Elsevier BV
Published
2015-02
Volume
145
Issue
2
Pages
246-252
ISSN
0022-3166 (ISSN-L)
OpenAlex
W2143022335
Cited by
119
References
36
Citations by year
2026: 3 · 2025: 8 · 2024: 11 · 2023: 7 · 2022: 12 · 2021: 10 · 2020: 9 · 2019: 13 · 2018: 15 · 2017: 12 · 2016: 14 · 2015: 5
FWCI
5.15
Type
journal article
Language
en
Open access
Locations
  • Journal of Nutrition (publishedVersion)
  • PubMed (publishedVersion)
Funders
Dairy Research Institute
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Physiology (medical) › Nutrition and Health in Aging
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
whey protein supplementation, myofibrillar protein synthesis, lipolysis, caloric restriction, weight loss, soy protein, protein quality, muscle protein synthesis, fat loss, phenylalanine tracer, overweight and obesity, hypocaloric diet, carbohydrate supplementation, fat oxidation, substrate oxidation, lipoprotein lipase
MeSH terms
Whey Proteins, Adult, Aged, Energy Intake, Double-Blind Method, Female, Humans, Male, Middle Aged, Milk Proteins, Myofibrils, Obesity, Phenylalanine, Protein Biosynthesis, Weight Loss, Body Mass Index, Muscle, Skeletal, Postprandial Period, Dietary Supplements, Soybean Proteins, Caloric Restriction, Overweight

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