Prolonged adaptation to a low or high protein diet does not modulate basal muscle protein synthesis rates: A substudy
Journal article
Hursel, Rick, Martens, Eveline A. P., Gonnissen, Hanne K. J., Hamer, Henrike M., Senden, Joan M., Van Loon, Luc and Westerterp-Plantenga, Margriet S.. (2015). Prolonged adaptation to a low or high protein diet does not modulate basal muscle protein synthesis rates: A substudy. PLoS ONE. 10(9), pp. 1 - 15. https://doi.org/10.1371/journal.pone.0137183
Authors | Hursel, Rick, Martens, Eveline A. P., Gonnissen, Hanne K. J., Hamer, Henrike M., Senden, Joan M., Van Loon, Luc and Westerterp-Plantenga, Margriet S. |
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Abstract | Background Based on controlled 36 h experiments a higher dietary protein intake causes a positive protein balance and a negative fat balance. A positive net protein balance may support fat free mass accrual. However, few data are available on the impact of more prolonged changes in habitual protein intake on whole-body protein metabolism and basal muscle protein synthesis rates. Objective To assess changes in whole-body protein turnover and basal muscle protein synthesis rates following 12 weeks of adaptation to a low versus high dietary protein intake. Methods A randomized parallel study was performed in 40 subjects who followed either a high protein (2.4 g protein/kg/d) or low protein (0.4 g protein/kg/d) energy-balanced diet (30/35/35% or 5/60/35% energy from protein/carbohydrate/fat) for a period of 12 weeks. A subgroup of 7 men and 8 women (body mass index: 22.8±2.3 kg/m2, age: 24.3±4.9 y) were selected to evaluate the impact of prolonged adaptation to either a high or low protein intake on whole body protein metabolism and basal muscle protein synthesis rates. After the diet, subjects received continuous infusions with L-[ring-2H5]phenylalanine and L-[ring-2H2]tyrosine in an overnight fasted state, with blood samples and muscle biopsies being collected to assess post-absorptive whole-body protein turnover and muscle protein synthesis rates in vivo in humans. Results After 12 weeks of intervention, whole-body protein balance in the fasted state was more negative in the high protein treatment when compared with the low protein treatment (-4.1±0.5 vs -2.7±0.6 μmol phenylalanine/kg/h;P < 0.001). Whole-body protein breakdown (43.0±4.4 vs 37.8±3.8 μmol phenylalanine/kg/h;P < 0.03), synthesis (38.9±4.2 vs 35.1±3.6 μmol phenylalanine/kg/h;P < 0.01) and phenylalanine hydroxylation rates (4.1±0.6 vs 2.7±0.6 μmol phenylalanine/kg/h;P < 0.001) were significantly higher in the high vs low protein group. Basal muscle protein synthesis rates were maintained on a low vs high protein diet (0.042±0.01 vs 0.045±0.01%/h;P = 0.620). Conclusions In the overnight fasted state, adaptation to a low-protein intake (0.4 g/kg/d) does not result in a more negative whole-body protein balance and does not lower basal muscle protein synthesis rates when compared to a high-protein intake. |
Year | 2015 |
Journal | PLoS ONE |
Journal citation | 10 (9), pp. 1 - 15 |
Publisher | Public Library of Science |
ISSN | 1932-6203 |
Digital Object Identifier (DOI) | https://doi.org/10.1371/journal.pone.0137183 |
Scopus EID | 2-s2.0-84947460679 |
Open access | Open access |
Page range | 1 - 15 |
Research Group | Mary MacKillop Institute for Health Research |
Publisher's version | |
Additional information | [http://creativecommons.org/licenses/by/4.0/] |
Place of publication | United States |
https://acuresearchbank.acu.edu.au/item/883xq/prolonged-adaptation-to-a-low-or-high-protein-diet-does-not-modulate-basal-muscle-protein-synthesis-rates-a-substudy
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