Creatine Loading Does Not Preserve Muscle Mass or Strength During Leg Immobilization in Healthy, Young Males: A Randomiz
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ORIGINAL RESEARCH ARTICLE
Creatine Loading Does Not Preserve Muscle Mass or Strength During Leg Immobilization in Healthy, Young Males: A Randomized Controlled Trial Evelien M. P. Backx1,2,3 • Roland Hangelbroek1,2 • Tim Snijders2,3 • Marie-Louise Verscheijden4 • Lex B. Verdijk2,3 • Lisette C. P. G. M. de Groot1,2 Luc J. C. van Loon2,3
•
Ó The Author(s) 2017. This article is published with open access at Springerlink.com
Abstract Background A short period of leg immobilization leads to rapid loss of muscle mass and strength. Creatine supplementation has been shown to increase lean body mass in active individuals and can be used to augment gains in muscle mass and strength during prolonged resistance-type exercise training. Objective Our objective was to investigate whether creatine loading can attenuate the loss of muscle mass and strength during short-term leg immobilization. Methods Healthy young men (n = 30; aged 23 ± 1 years; body mass index [BMI] 23.3 ± 0.5 kg/m-2) were randomly assigned to either a creatine or a placebo group. Subjects received placebo or creatine supplements (20 g/d) for 5 days before one leg was immobilized by means of a full-leg cast for 7 days. Muscle biopsies were taken before creatine loading, prior to and immediately after leg immobilization, and after 7 days of subsequent recovery. Quadriceps cross-sectional area (CSA) (computed tomography [CT] scan) and leg muscle strength (one-repetition maximum [1-RM] knee extension) were assessed before and immediately after immobilization and after 1 week of
& Luc J. C. van Loon [email protected] 1
Department of Human Nutrition, Wageningen University, Wageningen, The Netherlands
2
Top Institute Food and Nutrition, Wageningen, The Netherlands
3
NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands
4
Department of Surgery, Maastricht University Medical Centre?, Maastricht, The Netherlands
recovery. Data were analyzed using repeated measures analysis of variance (ANOVA). Data are presented consistently as mean ± standard error of the mean (SEM). Results There was a significant overall increase in muscle total creatine content following the 5-day loading phase (p = 0.049), which appeared driven by an increase in the creatine group (from 90 ± 9 to 107 ± 4 mmol/kg-1 dry muscle) with no apparent change in the placebo group (from 88 ± 4 to 90 ± 3 mmol/kg-1; p = 0.066 for time 9 treatment interaction). Quadriceps muscle CSA had declined by 465 ± 59 and 425 ± 69 mm2 (p \ 0.01) in the creatine and placebo group, respectively, with no differences between groups (p = 0.76). Leg muscle strength decreased from 56 ± 4 to 53 ± 4 kg in the creatine and from 59 ± 3 to 53 ± 3 kg in the placebo group, with no differences between groups (p = 0.20). Muscle fiber size did not change significantly over time in either group (p [ 0.05). When non-responders to creatine loading were excluded (n = 6), responders (n = 8; total creatine content increasing from 7
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