Abstract
Purpose
This study investigated the effect of creatine (CR) supplementation during cast-immobilization to preserve skeletal muscle total work, power and intramuscular phosphocreatine (PCr) kinetics during dynamic exercise.
Methods
Twenty-five active individuals (24 ± 4 years,) performed wrist flexion exercise within a 1.9 Tesla superconducting magnet before and after 1 week of cast-immobilization. An incremental protocol to fatigue and two constant load (CL1 and CL2) exercise bouts were performed. While casted, participants consumed either 20 g day−1 of CR or a placebo (PLA). 31P magnetic resonance spectroscopy was used to quantify in vivo intramuscular PCr levels.
Results
No significant group × time interaction effects were found for work or power throughout all exercise bouts. Total work was significantly reduced over time in both groups (p = 0.049) during the incremental exercise bout. Work production in CL1 tended (p = 0.073) to attenuate in the CR group, compared to PLA. No changes were observed in CL2. Baseline PCr significantly decreased with casting in PLA (PRE: 26.6 ± 6.3 vs. POST: 22.5 ± 5.6 mM kg−1 wet muscle, p = 0.003). No change (p = 0.31) was observed in the CR group. Changes in work production were significantly correlated with changes in resting PCr in CR (r = −0.63, p = 0.021) but not PLA (r = −0.36, p = 0.26) group.
Conclusions
Results suggest decreases in short-term endurance may be due to alternations of PCr status and/or metabolism. More research is needed to fully determine the efficacy of CR supplementation during short-term immobilization.
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Abbreviations
- ANOVA:
-
Analysis of variance
- ATP:
-
Adenosine triphosphate
- CR:
-
Creatine
- CL1:
-
Constant load exercise bout 1
- CL2:
-
Constant load exercise bout 2
- CSA:
-
Cross-sectional area
- FIDs:
-
Free induction decays
- MRS:
-
Magnetic resonance spectroscopy
- NMR:
-
New Mexico Resonance
- PCr:
-
Phosphocreatine
- Pi:
-
Inorganic phosphate
- PLA:
-
Placebo
- P:
-
Power
- SE:
-
Standard error
- W:
-
Work
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Acknowledgments
The authors would like to thank Joan Iverson for subject scheduling and randomization, and Rob Robergs, Hung Sheng Hsu, Nicole Vargas, Roy Salgado, Matt DuSold, and Jason Beam for technical support. Partial funding for this study was provided by a graduate research and development grant from the University of New Mexico’s Graduate and Professional Student Association.
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Communicated by Michael Lindinger.
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Fransen, J.C., Zuhl, M., Kerksick, C.M. et al. Impact of creatine on muscle performance and phosphagen stores after immobilization. Eur J Appl Physiol 115, 1877–1886 (2015). https://doi.org/10.1007/s00421-015-3172-2
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DOI: https://doi.org/10.1007/s00421-015-3172-2