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 D = 6 m/rev x cadence in rev/min Time = 1 minute

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

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

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

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

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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