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Metabolic Calculations

This guide details essential metabolic calculations for submaximal exercise, focusing on cycle ergometry and treadmill activities. It explains how to compute work, work rate, and oxygen consumption (VO2) using formulas based on distance, force, cadence, and body mass. The nuances of walking versus running, including the impact of speed and grade on VO2, are explored, offering clarity on how to optimize exercise prescriptions for intensity. Ideal for fitness professionals and exercise physiologists, it provides vital insights into effective metabolic assessments.

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Metabolic Calculations

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  1. Metabolic Calculations Submaximal Exercise

  2. Cycle Ergometry • Work = Force x Distance • F = tension • D = 6 m/rev x pedal cadence in rev/min • Work Rate = Force x Distance / time • F = tension • D = 6 m/rev x cadence in rev/min • Time = 1 minute

  3. Cycle Ergometer Formulas • Leg Cycling VO2 = 1.8 (work rate) / M + 7 Work rate in kg .m / min M = mass in kg VO2 = ( 10.8 . W / M ) + 7 Work rate in Watts M = mass in kg

  4. Treadmill Walking & Running • Oxygen cost • moving forward • moving vertically upward • Moving belt reduces oxygen cost compared to walking on normal ground • Similar work means walking at ~1% grade

  5. Calculating VO2 • Speed • 1 mph = 26.8 meters/min • Fractional grade = (% grade / 100) • Units are in ml/kg/min • Walking vs. Running and metabolic calculations • Running - faster movement and greater vertical displacement = increased oxygen cost • Walking = speeds up to 3.7 mph if truly walking • Running = speeds from 3.0 mph if truly running

  6. Calculating VO2 • Walking: VO2 = 0.1 (speed) + 1.8 (speed) (fractional grade) + 3.5 • Running: VO2 = 0.2 (speed) + 0.9 (speed) (fractional grade) + 3.5

  7. Calculating VO2 • Two variables to deal with for predictions: speed and grade • Can prescribe speed, grade, or both to elicit work intensity (VO2) .

  8. End

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