2 Conversion Factors used in Metabolic Calculations 1 KG= 2.2 lb160 lb/2.2=72.7 kg kgX 2.2=132 lb1 mph= 26.8 meters per minute6.0 mph x 26.8 = m.min
3 Conversions, cont. Min/mile pace= 60 min/mph 1 L = 1000 ml 60 min/7mph= 8.6 min/mile or 8:36 min:sec/mile60 sec x 0.6 min= 36 sec1 L = 1000 ml1 L of O2= 5 kcal1 MET = 3.5 ml . Kg . Min1 MET = 1 kcal . Kg . Hr1 Watt= 6 kgm.min540 kgm/6 = 90 Wattskgm.min= kg x 6 x rpm (monark cycle)
4 Metabolic terms: Absolute VO2= rate of O2 uptake in Liters/min. Relative VO2= rate of O2 uptake in ml/kg/min. Used to compare VO2 between individuals of different body size.Gross VO2= total consumption of O2 under any circumstancesNet VO2= O2 consumption rate above resting O2 consumption rate.Used to describe the caloric cost of exercise
5 ACSM Leg Ergometry Equation: For power outputs between kgm/min, or wattsVO2= (1.8 x kgm/min)/ M (wt. in kg) + (7)OrVO2= (10.8 x watts) / M (wt. in kg) + (7)
6 ACSM Leg Ergometry Equation To calculate the energy expenditure of a 62 kg woman cycling at a work rate of 450 kgm.min:
7 VO2= (1.8 x 450)/ 62 + 7 VO2= 810/62 + 7 VO2= 13 + 7 VO2= 20 ml/kg/min To calculate the energy expenditure of a 62 kg woman cycling at a work rate of 450 kgm.min:VO2= (1.8 x 450)/VO2= 810/62 + 7VO2=VO2= 20 ml/kg/min
8 ACSM Walking EquationFor speeds of m/min. ( mph)VO2= Resting Component + Horizonal Component + Vertical ComponentR= 3.5 ml. kg. min.H=speed (m/min) X 0.1V=grade (decimal) X m/min X 1.8VO2= (0.1 x S) + (1.8 x S x G) + 3.5(H) (V) (R)
9 ACSM Walking EquationCalculate VO2 for a 70 kg subject who is walking on the treadmill at a speed of 3.5 mph and a grade of 10%:
10 Calculate VO2 for a 70 kg subject who is walking on the treadmill at a speed of 3.5 mph and a grade of 10%:1. Convert speed in mph to m.min (3.5 x 26.8= 93.8)2. Calculate horizontal component. H = speed (m.min) x 0.1 (93.9 x 0.1 = 9.38 ml.kg.min3. Calculate vertical component: V= grade (decimal) x speed x 1.8 (.10 x 93.8 x 1.8= ml.kg.min4. Calculate total VO2 by adding H, V, and R (resting) components: VO2= H + V + R ( )= ml.kg.minConvert VO2 to METS by dividing by 3.5: (29.76/3.5 = 8.5 METSHow many kcals burned in 20 minutes?
11 ACSM Running/Jogging Formula For speeds > 134 m/min (>5.0 mph), (or for speeds as low as 3mph if jogging)VO2= Resting Component + Horizontal Component + Vertical ComponentR= 3.5 ml.kg.minH= speed (m/min) X 0.2V= grade (decimal) X m/min X 0.9VO2= (0.2 x S) + (0.9 x S x G) + 3.5(H) (V) (R)
12 ACSM Jogging/Running Formula Calculate VO2 for someone running a 7.5 mph. (200 meters/min) With a 5% grade?
13 For uphill running, add: grade (decimal) x m/min x 0.9 Calculate VO2 for someone running at 7.5 mph. (200 meters/min)With a 5% grade?VO2= 3.5+ (m/min X 0.2)43.5= (200 x 0.2)For uphill running, add:grade (decimal) x m/min x 0.9VO2= (200 x 0.2) + (.05 x 200 x 0.9)VO2= 52.5
14 What is the total amount of work on a cycle ergometer Kpm/minJoulesWith 2-kg resistance, 6 m•rev–1, 60 rev•min–1 for 5 min
15 With 2-kg resistance, 6 m•rev–1, 60 rev•min–1 for 5 min 2 kg needs to go to N X 9.79 = 19.5819.58 x 6m/rev x 60 revs/min x 5 min35244 JoulesFor kpm/min – use 2 kg and do not convert to N3600 kpm/min
16 Calculate the avg. power output during 10 min of cycle ergometer Exercise in which a total of 10,000 kpm of work was performedAnswer in kpm/min and Watts
17 Calculate the avg. power output during 10 min of cycle ergometer exercise in which a total of 10,000 kpm of work was performed.Answer in kpm/min and WattsWork = Force X DistancePower = Force X Distance divided by time10,000 kpm of workDivide by 10 min1,000 kpm/min1,000/6 = Watts1 Watt = 6 kgm/min
18 Calculate the work during 2-min of treadmill exercise by a 60-kg person running at 200 meters/min up a 10 % grade.
19 Calculate the work during 2-min of treadmill exercise by a 60-kg person running at 200 meters/min up a 10 % grade.Vertical displacement = % grade x distance0.1 x (200 m•min–1 x 2 min) = 40 mWork = body weight x total vertical distance60 kg x 9.79 = N587.4 N x 40 m = JPower = work ÷ time23496 J ÷ 120 s = W