Abstract
Twenty-seven non-elite CrossFit subjects (mean ± SD age = 34.58 ± 9.26 years) were randomly assigned to a LCKD (males, n = 3; females, n = 9) or control (CON) (males, n = 2; females, n = 13) group. LCKD was instructed to consume an ad libitum diet and restrict carbohydrate intake to less than 50 grams per day and CON maintained usual dietary intake. All subjects participated in four CrossFit training sessions per week during the 6 weeks.
Highlights
The prevalence of obesity has increased throughout the United States with one in three Americans categorized as obese [30]
The aim of the current study was to examine the effects of a 6-week low-carbohydrate ketogenic diet (LCKD) and CrossFit training on body composition and performance
The present study revealed that adhering to a LCKD during 6-weeks of CrossFit training results in significant decreases in weight, body mass index (BMI), %BF, and fat mass (FM) compared with an ad libitum diet while maintaining lean body mass (LBM)
Summary
The prevalence of obesity has increased throughout the United States with one in three Americans categorized as obese [30]. CrossFit is a high-intensity power training (HIPT) type exercise that consists of a combination of gymnastics, plyometrics, functional movements, anaerobic intervals, weightlifting, sprinting, and Olympic lifting [7, 26]. These constantly varied exercises, which are combined into the “Workout of the Day” (WOD) [7], allow for training in all three human energy systems: the creatine phosphate (CP) system, anaerobic glycolysis, and oxidative phosphorylation [1] and can be adapted for all levels of age and fitness [6]. Ketogenic diets are recognized as one of the more effective treatments for improvements in body weight, body composition, fasting serum lipid levels, and diet tolerability, especially when compared to low-fat diets [15, 25, 31,32,33]
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