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Article

Is a Four-Week Ketogenic Diet an Effective Nutritional Strategy in CrossFit-Trained Female and Male Athletes?

1
Department of Sports Dietetics, Poznan University of Physical Education, 61-871 Poznań, Poland
2
Department of Human Nutrition and Dietetics, Poznan University of Life Sciences, 60-624 Poznań, Poland
3
Department of Physiology and Biochemistry, Poznan University of Physical Education, 61-871 Poznań, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Jill Parnell
Nutrients 2021, 13(3), 864; https://doi.org/10.3390/nu13030864
Received: 31 January 2021 / Revised: 27 February 2021 / Accepted: 2 March 2021 / Published: 6 March 2021
(This article belongs to the Special Issue Performance Nutrition in Diverse Populations)
This single-arm interventional study examined the effect of a 4-week ketogenic diet (KD) on aerobic capacity and discipline-specific performance in female (n = 11) and male (n = 11) CrossFit-trained athletes. The participants performed incremental cycling (ICT) and Fight Gone Bad (FGB) tests after consuming a customary diet and a KD. Pre- and post-ICT exercise blood samples were also analysed. Consuming a KD had a slight impact on aerobic capacity and no relevant effect on CrossFit-specific performance. In females, consuming a KD led to an 10.4% decrease in peak oxygen uptake during the ICT (p = 0.027) and resulted in certain alterations in haematological parameters (haemoglobin (HGB), mean corpuscular HGB, and mean corpuscular HGB concentration). Furthermore, in males, alanine aminotransferase activity increased with a simultaneous improvement in the post-ICT blood acid–base balance after consuming a KD. The pre-exercise bilirubin concentration was also elevated in the entire group after consuming a KD. In conclusion, female CrossFit-trained athletes seem to be prone to aerobic performance decrements and increased risk of developing haematological disturbances when consuming a KD. In males who consumed a KD, there was an undesirable alanine aminotransferase elevation and a small tendency towards improved acid–base status. Moreover, consuming a KD had no effect on discipline-specific performance in CrossFit-trained athletes. View Full-Text
Keywords: low-carbohydrate; high-fat diet; high-intensity functional training; sports nutrition; nutritional support; exercise performance; physical capacity low-carbohydrate; high-fat diet; high-intensity functional training; sports nutrition; nutritional support; exercise performance; physical capacity
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MDPI and ACS Style

Durkalec-Michalski, K.; Nowaczyk, P.M.; Główka, N.; Ziobrowska, A.; Podgórski, T. Is a Four-Week Ketogenic Diet an Effective Nutritional Strategy in CrossFit-Trained Female and Male Athletes? Nutrients 2021, 13, 864. https://doi.org/10.3390/nu13030864

AMA Style

Durkalec-Michalski K, Nowaczyk PM, Główka N, Ziobrowska A, Podgórski T. Is a Four-Week Ketogenic Diet an Effective Nutritional Strategy in CrossFit-Trained Female and Male Athletes? Nutrients. 2021; 13(3):864. https://doi.org/10.3390/nu13030864

Chicago/Turabian Style

Durkalec-Michalski, Krzysztof, Paulina M. Nowaczyk, Natalia Główka, Anna Ziobrowska, and Tomasz Podgórski. 2021. "Is a Four-Week Ketogenic Diet an Effective Nutritional Strategy in CrossFit-Trained Female and Male Athletes?" Nutrients 13, no. 3: 864. https://doi.org/10.3390/nu13030864

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