Resting metabolism represents 60% to 75% of Total Daily Energy Expenditure (TDEE). Standard predictive formulas (such as the Harris-Benedict or Mifflin-St Jeor equations) rely exclusively on population averages and static anthropometrics. These mathematical models fail to capture individual variances in metabolically active organ mass, thyroid and endocrine function, or prior metabolic adaptations, routinely miscalculating baseline caloric expenditure by 20% to 30%.

Through the KORR CardioCoach PRO metabolic cart, AZM Performance Lab performs indirect calorimetry. By capturing pulmonary gas exchanges—measuring the exact volume of oxygen extracted (VO2 ) and carbon dioxide exhaled (VCO2 )—the system calculates your resting Respiratory Exchange Ratio (RER = VCO2 / VO2 ). This data reveals the exact split of fats versus carbohydrates your body metabolizes at complete rest.

Clinical & Performance Applications

• Overcoming Metabolic Adaptation & Weight Loss Plateaus: Identifies adaptive thermogenesis—where resting energy expenditure downregulates below expected physiological values following chronic caloric deficits. 
• Targeted Lean Mass Hypertrophy: Establishes the exact hypercaloric surplus required to support protein synthesis and muscular accretion without unwanted adipose accumulation.
• Mitigating Relative Energy Deficiency in Sport (RED-S): Screens endurance athletes for Low Energy Availability (LEA), verifying that nutritional intake adequately matches heavy training volume to safeguard hormonal and bone health.

The assessment requires a 15- to 20-minute resting protocol conducted in a quiet, thermo-neutral environment while reclining comfortably in a supine position, following an overnight fast. Deliverables include a detailed metabolic profile outlining measured resting caloric needs, baseline substrate utilization percentages, and targeted nutritional guidelines calibrated to your unique metabolic output.