Short-term muscle disuse induces a rapid and sustained decline in daily myofibrillar protein synthesis rates
Journal article
Kilroe, Sean P., Fulford, Jonathan, Holwerda, Andrew M., Jackman, Sarah R., Lee, Benjamin P., Gijsen, Annemie P., van Loon, Luc J. C. and Wall, Benjamin T.. (2019). Short-term muscle disuse induces a rapid and sustained decline in daily myofibrillar protein synthesis rates. American Journal of Physiology - Endocrinology and Metabolism. 318(2), pp. E117-E130. https://doi.org/10.1152/ajpendo.00360.2019
Authors | Kilroe, Sean P., Fulford, Jonathan, Holwerda, Andrew M., Jackman, Sarah R., Lee, Benjamin P., Gijsen, Annemie P., van Loon, Luc J. C. and Wall, Benjamin T. |
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Abstract | Short-term muscle disuse has been reported to lower both postabsorptive and postprandial myofibrillar protein synthesis rates. This study assessed the impact of disuse on daily myofibrillar protein synthesis rates following short-term (2 and 7 days) muscle disuse under free living conditions. Thirteen healthy young men (age: 20 ± 1 yr; BMI: 23 ± 1 kg/m−2) underwent 7 days of unilateral leg immobilization via a knee brace, with the nonimmobilized leg acting as a control. Four days before immobilization participants ingested 400 mL of 70% deuterated water, with 50-mL doses consumed daily thereafter. Upper leg bilateral MRI scans and muscle biopsies were collected before and after 2 and 7 days of immobilization to determine quadriceps volume and daily myofibrillar protein synthesis rates. Immobilization reduced quadriceps volume in the immobilized leg by 1.7 ± 0.3 and 6.7 ± 0.6% after 2 and 7 days, respectively, with no changes in the control leg. Over the 1-wk immobilization period, myofibrillar protein synthesis rates were 36 ± 4% lower in the immobilized (0.81 ± 0.04%/day) compared with the control (1.26 ± 0.04%/day) leg (P < 0.001). Myofibrillar protein synthesis rates in the control leg did not change over time (P = 0.775), but in the immobilized leg they were numerically lower during the 0- to 2-day period (16 ± 6%, 1.11 ± 0.09%/day, P = 0.153) and were significantly lower during the 2- to 7-day period (44 ± 5%, 0.70 ± 0.06%/day, P < 0.001) when compared with the control leg. We conclude that 1 wk of muscle disuse induces a rapid and sustained decline in daily myofibrillar protein synthesis rates in healthy young men. |
Keywords | atrophy; disuse; immobilization; muscle protein synthesis rates; skeletal muscle |
Year | 2019 |
Journal | American Journal of Physiology - Endocrinology and Metabolism |
Journal citation | 318 (2), pp. E117-E130 |
Publisher | American Physiological Society |
ISSN | 0193-1849 |
Digital Object Identifier (DOI) | https://doi.org/10.1152/ajpendo.00360.2019 |
Scopus EID | 2-s2.0-85078382012 |
Open access | Published as green open access |
Page range | E117-E130 |
Funder | The Royal Society |
Exeter University | |
Maastricht University | |
National Institute for Health Research (NIHR) | |
Author's accepted manuscript | License All rights reserved File Access Level Open |
Publisher's version | License All rights reserved File Access Level Controlled |
Output status | Published |
Publication dates | |
Online | 21 Jan 2020 |
Publication process dates | |
Accepted | 14 Nov 2019 |
Deposited | 07 May 2021 |
Grant ID | CRF/2016/10027 |
https://acuresearchbank.acu.edu.au/item/8vzq3/short-term-muscle-disuse-induces-a-rapid-and-sustained-decline-in-daily-myofibrillar-protein-synthesis-rates
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AM_Kilroe_2020_Short-term_muscle_disuse_induces_a_rapid.pdf | |
License: All rights reserved | |
File access level: Open |
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