Understanding Calories Burned & Exercise Metabolism
When performing any physical exertion, your skeletal muscles require adenosine triphosphate (ATP) to contract, requiring your cardiovascular and respiratory systems to supply oxygen. The scientific standard for measuring exercise energy expenditure is the Metabolic Equivalent of Task (MET).
Governing MET Calorie Expenditure Formula
Calories Burned=METรWeight (kg)ร
Duration (minutes)60 (mins / hr)
MET Intensity Benchmarks
Light Activity: < 3.0 METs|Moderate Activity: 3.0 โ 6.0 METs|Vigorous Activity: > 6.0 METs
Step-by-Step Calculation Breakdown (Running at 6 mph for 30 min)
Step 1: Convert Weight to Kilograms & Time to Hours
Weight in kg = 154 lbs ร 0.453592 = 69.85 kg
Duration in hours = 30 min รท 60 = 0.50 hours
Step 2: Multiply Activity MET by Weight and Time
Running (6 mph) MET = 9.8
Calculation: 9.8 ร 69.85 kg ร 0.50 hrs = 342.28 kcal
Calculation: 9.8 ร 69.85 kg ร 0.50 hrs = 342.28 kcal
Step 3: Final Energy Expenditure
Total Calories Burned=342 kcal (11.4 kcal/min)
MET Comparison of Common Workouts
| Exercise Category | MET Score | Intensity Level | Avg Burn (154 lb / 30m) |
|---|---|---|---|
| HIIT / CrossFit | 12.0 | Very High | 419 kcal |
| Running (7.5 mph) | 12.3 | Vigorous | 430 kcal |
| Cycling (14-16 mph) | 10.0 | Vigorous | 349 kcal |
| Weight Lifting (Vigorous) | 8.0 | Moderate-High | 279 kcal |
| Brisk Walking (3.5 mph) | 4.3 | Moderate | 150 kcal |