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European Journal of Nutrition

, Volume 58, Issue 2, pp 583–595 | Cite as

Even effect of milk protein and carbohydrate intake but no further effect of heavy resistance exercise on myofibrillar protein synthesis in older men

  • Søren ReitelsederEmail author
  • Kasper Dideriksen
  • Jakob Agergaard
  • Nikolaj M. Malmgaard-Clausen
  • Rasmus L. Bechshoeft
  • Rasmus K. Petersen
  • Anja Serena
  • Ulla R. Mikkelsen
  • Lars Holm
Original Contribution

Abstract

Purpose

The responsiveness of older individuals’ skeletal muscle to anabolic strategies may be impaired. However, direct comparisons within the same experimental setting are sparse. The aim of this study was to assess the resting and post-resistance exercise muscle protein synthesis rates in response to two types of milk protein and carbohydrate using a unilateral exercise leg model.

Methods

Twenty-seven older (69 ± 1 year, mean ± SE) men were randomly assigned one of three groups: Whey hydrolysate (WH), caseinate (CAS), or carbohydrate (CHO). By applying stable isotope tracer techniques (L-[15N]phenylalanine), the fasted-rested (basal) myofibrillar fractional synthesis rate (FSR) was measured. Hereafter, FSR was measured in the postprandial phase (0.45 g nutrient/kg LBM) in both legs, one rested (fed-rest) and one exercised (10 × 8 reps at 70% 1RM; fed-exercise). In addition, the activity of p70S6K and venous plasma insulin, phenylalanine, and leucine concentrations were measured.

Results

Insulin, phenylalanine, and leucine concentrations differed markedly after intake of the different study drinks. The basal FSR in WH, CAS, and CHO were 0.027 ± 0.003, 0.030 ± 0.003, and 0.030 ± 0.004%/h, the fed-rested FSR were 0.043 ± 0.004, 0.045 ± 0.003, and 0.035 ± 0.004%/h, and the fed-exercised FSR were 0.041 ± 0.004, 0.043 ± 0.004, and 0.034 ± 0.004%/h, respectively. No significant differences were observed at any state between the groups. Fed-rested- and fed-exercised FSR were higher than basal (P < 0.001). 3 h after exercise and feeding, no significant group differences were detected in the activity of p70S6K.

Conclusions

Milk protein and carbohydrate supplementation stimulate myofibrillar protein synthesis in older men, with no further effect of heavy resistance exercise within 0–3 h post exercise.

Keywords

Whey hydrolysate Caseinate Anabolic resistance Muscle protein Sarcopenia 

Notes

Acknowledgements

We thank our voluntary participants for their time and effort, and Ann-Marie Sedstrøm and Ann-Christina Reimann for technical assistance and analyses. Arla Foods Ingredients P/S supported this work.

Author contributions

SR, KD, JA, NMM-C, RLB conducted the experimental work; SR, KD, JA, RKP, and LH analysed and interpreted data; SR, KD, AS, URM, and LH designed study; SR drafted the manuscript; all authors edited and revised the manuscript. All authors approved the final content and this version of the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare no conflicts of interest, financial or otherwise. Anja Serena is employed at Arla Foods amba, and Ulla R. Mikkelsen is employed at Arla Foods Ingredients P/S.

Supplementary material

394_2018_1641_MOESM1_ESM.docx (1.5 mb)
Supplementary material 1 (DOCX 1583 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Søren Reitelseder
    • 1
    Email author
  • Kasper Dideriksen
    • 1
  • Jakob Agergaard
    • 1
  • Nikolaj M. Malmgaard-Clausen
    • 1
  • Rasmus L. Bechshoeft
    • 1
  • Rasmus K. Petersen
    • 3
  • Anja Serena
    • 4
  • Ulla R. Mikkelsen
    • 5
  • Lars Holm
    • 1
    • 2
  1. 1.Institute of Sports Medicine Copenhagen, Department of Orthopedic Surgery M, Bispebjerg Hospital and Center for Healthy Aging, Faculty of Health and Medical SciencesUniversity of CopenhagenCopenhagen NVDenmark
  2. 2.School of Sport, Exercise and Rehabilitation SciencesUniversity of BirminghamBirminghamUK
  3. 3.Department of Biology, Faculty of ScienceUniversity of CopenhagenCopenhagenDenmark
  4. 4.Arla Foods ambaViby JDenmark
  5. 5.Arla Foods Ingredients Group P/SViby JDenmark

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