Postprandial muscle protein synthesis rate is unaffected by 20-day habituation to a high protein intake: a randomized controlled, crossover trial

Postprandial muscle protein synthesis rate is unaffected by 20-day habituation to a high protein intake: a randomized controlled, crossover trial

Purpose During the last decade more researchers have argued in favor of an increased protein intake for older adults. However, there is a lack of knowledge on the long-term effects of conforming to such a high protein intake with regards to the basal and postprandial muscle protein turnover. The pur...

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Bibliographic Details
Published in:European journal of nutrition Vol. 60; no. 8; pp. 4307 - 4319
Main Authors: Højfeldt, Grith, Bülow, Jacob, Agergaard, Jakob, Simonsen, Lene R., Bülow, Jens, Schjerling, Peter, van Hall, Gerrit, Holm, Lars
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-12-2021
Springer Nature B.V
Subjects:
Aged
Amino acids
Body mass
Chemistry
Chemistry and Materials Science
Clinical trials
Cross-Over Studies
Dietary Proteins
Habituation
Habituation, Psychophysiologic
Humans
Lean body mass
Long-term effects
Male
Meals
Muscle Proteins
Muscle, Skeletal
Nutrition
Original Contribution
Postprandial Period
Protein biosynthesis
Protein synthesis
Protein turnover
Proteins
Skeletal muscle
Protein breakdown
High protein intake
Intrinsically labelled proteins
Recommended protein intake
Protein synthesis
Habituated protein intake
Fractional synthesis rate
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Summary:Purpose During the last decade more researchers have argued in favor of an increased protein intake for older adults. However, there is a lack of knowledge on the long-term effects of conforming to such a high protein intake with regards to the basal and postprandial muscle protein turnover. The purpose of this study was to compare the postprandial synthesis response in muscle proteins, and the abundance of directly incorporated food-derived amino acids following habituation to high vs. recommended level of protein intake. Methods In a double blinded crossover intervention 11 older male participants (66.6 ± 1.7 years of age) were habituated for 20 days to a recommended protein (RP) intake (1.1 g protein/kg lean body mass (LBM)/day) and a high protein (HP) intake (> 2.1 g protein/kg LBM/day). Following each habituation period, intrinsically labelled proteins were ingested as part of a mixed meal to determine the incorporation of meal protein-derived amino acids into myofibrillar proteins. Furthermore, the myofibrillar fractional synthesis rate (FSR) and amino acid kinetics across the leg were determined using gold standard stable isotope tracer methodologies. RT qPCR was used to assess the expression of markers related to muscle proteinsynthesis and breakdown. Results No impact of habituation was observed on skeletal muscle amino acid or protein kinetics. However, the shunting of amino acids directly from artery to vein was on average 2.9 μ mol/min higher following habituation to HP compared to RP . Conclusions In older males, habituation to a higher than the currently recommended protein intake did not demonstrate any adaptions in the muscle protein turnover or markers hereof when subjected to an intake of an identical mixed meal. Clinical Trial Registry Journal number NCT02587156, Clinicaltrials.org. Date of registration: October 27th, 2015.
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ISSN:1436-6207
1436-6215
DOI:10.1007/s00394-021-02590-4