Cited by 50Diet and metabolism studiesMuscle metabolism and nutritionSports Performance and Training

Impact Of Ketogenic Diet On Athletes: Current Insights

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McSwiney, Fionn T, Doyle, Lorna, Plews, Daniel J., Zinn, Caryn·2019·Open Access Journal of Sports Medicine

Abstract

Abstract: The impact of a ketogenic diet (KD) (<50 g/d carbohydrate, >75% fat) on athletic performance has sparked much interest and self-experimentation in the past 3–4 years. Evidence shows 3–4-week adaptations to a KD in endurance-trained athletes were associated with maintenance of moderate (46–63% VO 2max ) and vigorous intensity (64–90% VO 2max ) endurance exercise, while at intensities >70% VO 2max , increases in fat oxidation were associated with decreased economy (increased oxygen consumption), and in some cases, increased ratings of perceived exertion and heart rate. Two investigations in recreationally active endurance athletes noted no vigorous intensity exercise decrement following 3- and 12-week adaptations. Moderate (70–85% one repetition maximum) and near-maximal to maximal intensity (>85% 1RM) strength performance experienced no decrement following a 3-12-week KD adaptation. Beneficial effects were noted for 2000 m sprint and critical power test completed for short duration at vigorous intensity, while two additional tests noted no decrement. For sprint, near-maximal exercise (>91% VO 2max ), benefit of the KD was observed for six-second sprint, while no decrement in performance was noted for two additional maximal tests. When protein is equated (grams per kilogram), one investigation noted no decrement in muscle hypertrophy, while one noted a decrement. One investigation with matched protein noted the KD group lost more body fat. In conclusion, moderate-to-vigorous intensity exercise experiences no decrement following adaptation to a KD. Decreases in exercise economy are observed >70% VO 2max in trained endurance athletes which may negate performance within field settings. Beneficial effects of the KD during short duration vigorous, and sprint bouts of exercises are often confounded by greater weight loss in the KD group. With more athletes pursuing carbohydrate-restricted diets (moderate and strict (KD)) for their proposed health benefits, more work is needed in the area to address both performance and health outcomes. Keywords: keto-adaptation, performance, endurance, strength, high intensity, low carbohydrate

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  • Some studies have illustrated no decrement in low CHO diets in moderate-to-vigorous intensity exercise, but these studies have also confirmed decreases in exercise economy in highly trained endurance athletes at greater than 70% of their VO2max compared to those with high CHO diets.

    “While some studies have illustrated no decrement in low CHO diets in moderate-to-vigorous intensity exercise experiences, these studies have also confirmed decreases in the exercise economy observed in highly trained endurance athletes at greater than 70% of their VO2max compared to those with high CHO diets [65].”

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  1. [7]Volek J, Phinney S (2012). The art and science of low carbohydrate performance. Beyond Obesity LLC. Available from: https://scholar.google.com/scholar?q=2012+art+and+science+of+low+carbohydrate+living+volek&btnG=&hl=en≈sdt=0%2C5 Accessed 10 9, 2019.

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Authors
McSwiney, F. T., Doyle, L., Plews, D. J., & Zinn, C.
Affiliations
  • Dublin City University (IE)
  • Waterford Institute of Technology (IE)
  • Auckland University of Technology (NZ)
Corresponding author
Zinn, Caryn
Venue
Open Access Journal of Sports Medicine
Published
2019-11
Volume
Volume 10
Pages
171-183
ISSN
1179-1543 (ISSN-L)
OpenAlex
W2984889983
Cited by
50
References
45
Citations by year
2026: 3 · 2025: 5 · 2024: 6 · 2023: 9 · 2022: 7 · 2021: 10 · 2020: 10
FWCI
0.79
Type
journal article
Language
en
Open access
Locations
  • Open Access Journal of Sports Medicine (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Dove Medical Press (Taylor and Francis Group) (submittedVersion, cc-by-nc)
Topics
  • Health Sciences › Medicine › Physiology › Diet and metabolism studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
ketogenic diet, athletic performance, endurance athletes, strength performance, sprint performance, exercise economy, fat oxidation, VO2max, muscle hypertrophy, fat loss, weight loss, carbohydrate restriction, high-intensity exercise

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