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Cited by 32Sports Performance and TrainingMuscle metabolism and nutritionMagnesium in Health and Disease

The Effects of Long-Term Magnesium Creatine Chelate Supplementation on Repeated Sprint Ability (RAST) in Elite Soccer Players

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Zajac, Adam, Golas, Artur, Chycki, Jakub, Halz, Mateusz, Michalczyk, Małgorzata Magdalena·2020·Nutrients
DOI 10.3390/nu12102961PMC PMC7600931
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Abstract

Aim: The aim of the study was to evaluate the effects of 16 weeks of a low dose of magnesium creatine chelate supplementation on repeated sprint ability test (RAST) results in elite soccer players. Materials: Twenty well-trained soccer players participated in the study. The players were divided randomly into two groups: the supplemented group (SG = 10) and placebo group (PG = 10). Out of the 20 subjects selected for the study, 16 (SG = 8, PG = 8) completed the entire experiment. The SG ingested a single dose of 5500 mg of magnesium creatine chelate (MgCr-C), in 4 capsules per day, which was 0.07 g/kg/d. The PG received an identical 4 capsules containing corn starch. Before and after the study, the RAST was performed. In the RAST, total time (TT), first and sixth 35 m sprint length (s), average power (AP) and max power (MP) were measured. Additionally, before and after the test, lactate LA (mmol/L) and acid–base equilibrium pH (-log(H+)), bicarbonates HCO3− (mmol/L) were evaluated. Also, in serum at rest, creatinine (mg/dL) concentration was measured. Results: After the study, significantly better results in TT, AP and MP were observed in the SG. No significant changes in the RAST results were observed in the PG. After the study, significant changes in the first 35 m sprint, as well as the sixth 35 m sprint results were registered in the SG, while insignificant changes occurred in the PG. A significantly higher creatinine concentration was observed. Also, a higher post-RAST concentration of LA, HCO3− and lower values of pH were observed in April, May and June compared with baseline values. Conclusions: The long timeframe, i.e., 16 weeks, of the low dose of magnesium creatine chelate supplementation improved the RAST results in the SG. Despite the long period of MgCr-C supplementation, in the end of the study, the creatinine level in the SG reached higher but still reference values.

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  • Creatinine levels significantly increased throughout training with MgCr-C compared to placebo, and this increase was higher than reported in long-term CrM studies during training in hot and humid environments.

    “creatinine levels were also significantly increased throughout training with MgCr-C (0.83 to 1.87 mmol/L) compared to placebo (0.92 to 0.82 mmol/L), which is higher than reported in other long-term CrM studies during training in hot and humid environments that administered 5–10 g/day of CrM for 21 months in well-trained athletes [144].”

    From Bioavailability, Efficacy, Safety, and Regulatory Status of Creatine and Related Compounds: A Critical Review (2022) · cites this paper as [191]

    The Results report that creatinine rose significantly from 0.83 at baseline to 1.87 after four weeks of MgCr-C, while it did not change significantly in the placebo group. The increase did not continue throughout training: creatinine fell to 1.38 by week 16. The Results give the placebo endpoint as 0.85, not 0.82, and the Discussion gives the creatinine unit as mg/dL, not mmol/L. Our copy does not support the claimed comparison with CrM studies conducted in hot and humid environments. (LLM, conf=0.91)

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  • 5.5 g/day of MgCr-C supplementation during 16 weeks of soccer training improved repeated sprint ability performance compared to placebo, but the study did not compare MgCr-C to CrM and performance changes were consistent with other CrM studies.

    “Zajac et al. [191] reported that 5.5 g/day of MgCr-C supplementation during 16 weeks of soccer training improved repeated sprint ability performance compared to placebo.”

    From Bioavailability, Efficacy, Safety, and Regulatory Status of Creatine and Related Compounds: A Critical Review (2022) · cites this paper as [191]

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Authors
Zajac, A., Golas, A., Chycki, J., Halz, M., & Michalczyk, M. M.
Affiliations
  • Institute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, Mikolowska 72a, 40-065 Katowice, Poland
  • Akademii Wychowania Fizycznego im. Jerzego Kukuczki w Katowicach (PL)
Corresponding author
Michalczyk, Małgorzata Magdalena
ORCID
Venue
Nutrients
Publisher
MDPI AG
Published
2020-09-28
Volume
12
Issue
10
Pages
2961
ISSN
2072-6643 (ISSN-L)
DOI
10.3390/nu12102961
PMC
PMC7600931
OpenAlex
W3088899813
Cited by
32
References
15
Citations by year
2026: 8 · 2025: 5 · 2024: 8 · 2023: 4 · 2022: 6 · 2021: 1
FWCI
2.62
Type
journal article
Language
en
Open access
Licence
Locations
  • Nutrients (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Nursing › Nutrition and Dietetics › Magnesium in Health and Disease
Keywords
dietary supplementation, repeated sprint ability, elite soccer players, creatine, creatinine, lactate, acid-base balance, bicarbonate, output power
MeSH terms
High-Intensity Interval Training, Adult, Chelating Agents, Creatine, Humans, Magnesium, Male, Soccer, Time Factors, Dietary Supplements, Athletic Performance, Young Adult

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