Fitness Coach & Athlete Assessment Desk

Biometric Assessment Methodology

This workspace aggregates peer-reviewed physiological equations to establish baseline metabolic and body composition metrics:

• Mifflin-St Jeor BMR Equation: Clinically validated formula estimating resting metabolic energy expenditure based on sex, body weight, height, and chronological age.
• Total Daily Energy Expenditure (TDEE): Scales BMR by physical activity multipliers ranging from 1.2 (sedentary desk routine) to 1.9 (intense athletic conditioning).
• US Navy Circumference Body Fat Method: Uses neck, waist, and hip circumference measurements to estimate body density and fat mass without laboratory densitometry.
• Hamwi Ideal Body Weight: Establishes a standardized demographic reference weight guideline (48 kg base for females at 5 ft, 48 kg + 2.7 kg/inch for males).
• Brzycki 1-Rep Maximum Estimation: Predicts maximal single-repetition strength capacity from submaximal training sets (Weight × [36 / (37 − Reps)]).

Worked Numeric Intake Example

Using the workspace baseline values (Male client, 28 years old, 80 kg body mass, 178 cm height, 38 cm neck, 86 cm waist, moderate exercise factor 1.55, 100 kg bench press for 6 repetitions):

1. BMR Calculation: 10 × 80 + 6.25 × 178 − 5 × 28 + 5 = 800 + 1112.5 − 140 + 5 = 1,778 kcal/day.
2. TDEE Calculation: Round(1,778 × 1.55) = 2,756 kcal/day maintenance baseline.
3. Navy Body Fat: Circumference differential (86 − 38 = 48 cm) yields ~15.8% body fat.
4. Hamwi Target: 178 cm corresponds to 5 ft 10 in: 48 + (10 × 2.7) = 75.0 kg reference mass.
5. Protein Target: Athletic baseline of 2.0 g/kg body mass yields 160 grams/day.
6. 1-Rep Max Bench: 100 × (36 / (37 − 6)) = 100 × (36 / 31) = 116 kg.