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Metabolic Calculations

Metabolic Calculations. Submaximal Exercise. 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. Cycle Ergometer Formulas. Leg Cycling

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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) .

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