The Katch-McArdle Formula for TDEE Estimation: Applications in Sports Science and Bodybuilding Research
Keywords:
Abstract
Accurately quantifying Total Daily Energy Expenditure (TDEE) is essential to practicing fitness science, sports nutrition, and bodybuilding research. Classic predictive equations, including Harris–Benedict and Mifflin–St. Jeor base their calculations primarily on total body weight and demographic factors that could underestimate calories in athletes and overestimate them in those with higher percentages of body fat. The Katch-McArdle (K-M) equation represents an important methodologic improvement because lean body mass (LBM), a major determinant of metabolism, is included and maintains the specificity for populations with greater muscle mass or unusual body composition. This report provides an extensive review of the theoretical background, validation studies, and applications of the K-M model in sport and clinical settings. Comparison with indirect calorimetry and doubly labeled water studies reveals the equation's close relationship to fat free mass and low error of the estimate, indicating that it is highly suited to resistance-trained individuals and athletes, such as bodybuilders. K-M use within nutritional periodization, optimization of physique and body weight regulation are also further discussed in the review with particular reference to methodology issues pertaining to the assessment of body composition. This article emphasises the equation’s utility as a convenient and evidence-based tool for customising energy availability targets and exercise training prescriptions, and advocates its potential in the progression of personalised protocols within sports science and applied nutrition research.
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