Pruebas (MET)

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Pruebas (MET)

  1. 1. Ecuaciones metabólicas del ACSM Texto original: Illinois Association of Family & Consumer Sciences Adaptación: Santiago Liébana Rado www.life-studio.es
  2. 2. Factores de conversión Sistemas de medición europeos & anglosajones <ul><li>1 KG= 2.2 lb </li></ul><ul><ul><li>160 lb/2.2=72.7 kg 60 kgX 2.2=132 lb </li></ul></ul><ul><li>1 pulgada= 2.54 cm (1 pie=12 pulgadas) </li></ul><ul><ul><li>12 in. x 2.54= 30.5 cm </li></ul></ul><ul><li>1 m= 100cm </li></ul><ul><ul><li>30.5 cm/100= 0.305 m </li></ul></ul><ul><li>1 mph (milla por hora)= 26.8 metros por minuto </li></ul><ul><ul><li>6.0 mph x 26.8 = 160.8 m.min </li></ul></ul>
  3. 3. Conversions, cont. <ul><li>Min/mile = 60 min/mph (minutos/milla) </li></ul><ul><ul><li>60 min/7mph= 8.6 min/mile or 8:36 min:sec/mile </li></ul></ul><ul><ul><li>60 sec x 0.6 min= 36 sec </li></ul></ul><ul><li>1 L = 1000 ml </li></ul><ul><li>1 L de O2 consumido= 5 kcal </li></ul><ul><li>1 MET = 3.5 ml . Kg . Min </li></ul><ul><li>1 MET = 1 kcal . Kg . Hr (aprox.) </li></ul><ul><li>1 Watt= 6 kgm.min </li></ul><ul><ul><li>540 kgm/6 = 90 Watts </li></ul></ul><ul><li>kgm.min= kg x 6 x rpm Es el producto de kilos y metros desplazados por ud. De tiempo (minutos) </li></ul>
  4. 4. Terminología: <ul><li>Consumo VO2 = Consumo total de oxígeno expresado en Litros/Min. </li></ul><ul><li>VO2 Relativo = Cantidad de O2 consumida y tomada en ml/kg/min. </li></ul><ul><li>Cantidad VO2 = Consumo de oxígeno en “bruto” bajo cualquier circunstancia. </li></ul><ul><li>VO2 neto = Consumo real de oxígeno en la actividad realizada. Diferencia entre la Cantidad VO2 bruta y el consumo de Oxígeno en reposo. </li></ul>
  5. 5. Ecuación ergométrica del ACSM: <ul><li>En ergómetros con capacidad para 300-1200 kgm/min o 50-200 watts </li></ul><ul><ul><li>VO2= (1.8 x kgm/min)/ M (wt. in kg) +(7) </li></ul></ul><ul><ul><li>ó </li></ul></ul><ul><ul><li>VO2= (10.8 x watts) / M (wt. in kg) + (7) </li></ul></ul>
  6. 6. Ejemplo <ul><li>Para calcular la energía utilizada en una mujer de 62 kgs. Con un trabajo de 450 kgm.min (75 watts) </li></ul><ul><li>VO2= (1.8 x 450)/ 62 + 7 </li></ul><ul><li>VO2= 810/62 + 7 </li></ul><ul><li>VO2= 13 + 7 </li></ul><ul><li>VO2= 20 ml/kg/min </li></ul>
  7. 7. ACSM Walking Equation <ul><li>For speeds of 50-100 m/min. (1.9-3.7 mph) </li></ul><ul><li>VO2= R esting Component + H orizonal Component + V ertical Component </li></ul><ul><li>R = 3.5 ml. kg. min. </li></ul><ul><li>H= speed (m/min) X 0.1 </li></ul><ul><li>V= grade (decimal) X m/min X 1.8 </li></ul><ul><li>VO2= (0.1 x S) + (1.8 x S x G) + 3.5 </li></ul><ul><ul><ul><ul><ul><li>(H) (V) (R) </li></ul></ul></ul></ul></ul>
  8. 8. ACSM Walking Equation <ul><li>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%: </li></ul><ul><li>1. Convert speed in mph to m.min (3.5 x 26.8= 93.8) </li></ul><ul><li>2. Calculate horizontal component. H = speed (m.min) x 0.1 (93.9 x 0.1 = 9.38 ml.kg.min) </li></ul><ul><li>3. Calculate vertical component: V= grade (decimal) x speed x 1.8 (.10 x 93.8 x 1.8= 16.88 ml.kg.min </li></ul><ul><li>4. Calculate total VO2 by adding H, V, and R (resting) components: VO2= H + V + R (9.38 + 16.88 + 3.5)= 29.76 ml.kg.min </li></ul><ul><li>Convert VO2 to METS by dividing by 3.5: (29.76/3.5 = 8.5 METS </li></ul>
  9. 9. ACSM Running/Jogging Formula <ul><li>For speeds > 134 m/min (>5.0 mph), (or for speeds as low as 3mph if jogging) </li></ul><ul><li>VO2= R esting Component + H orizontal Component + V ertical Component </li></ul><ul><li>R= 3.5 ml.kg.min </li></ul><ul><li>H= speed (m/min) X 0.2 </li></ul><ul><li>V= grade (decimal) X m/min X 0.9 </li></ul><ul><li>VO2= (0.2 x S) + (0.9 x S x G) + 3.5 </li></ul><ul><ul><ul><ul><ul><li>(H) (V) (R) </li></ul></ul></ul></ul></ul>
  10. 10. ACSM Jogging/running Formula <ul><li>Calculate VO2 for someone running a 7.5 mph. (200 meters/min) With a 5% grade? </li></ul><ul><li>VO2= 3.5+ (m/min X 0.2) </li></ul><ul><li>43.5= 3.5 + (200 x 0.2) </li></ul><ul><li>For uphill running, add: </li></ul><ul><ul><li>grade (decimal) x m/min x 0.9 </li></ul></ul><ul><ul><li>VO2= 3.5 + (200 x 0.2) + (.05 x 200 x 0.9) </li></ul></ul><ul><ul><li>VO2= 52.5 </li></ul></ul>
  11. 11. Arm Ergometer Equation <ul><li>For power outputs between 150-750 kgm.min or 25-125 watts: </li></ul><ul><li>VO2= (3 x kgm) / kg + 3.5 </li></ul><ul><li>Or </li></ul><ul><li>VO2= (18 x watts) / kg + 3.5 </li></ul>
  12. 12. ACSM Arm Egometer Equation <ul><li>Calculate VO2 for a 50 kg. Individual cycling at 600 kgm: </li></ul><ul><li>VO2= 3 x 600/50 +3.5 </li></ul><ul><li>VO2= 1800/50 + 3.5 </li></ul><ul><li>VO2= 36 + 3.5 </li></ul><ul><li>VO2= 39.5 ml.kg.min </li></ul>
  13. 13. ACSM Stepping Equation <ul><li>Convert stepping height in inches to meters </li></ul><ul><li>Stepping rate is steps per minute </li></ul><ul><li>VO2= </li></ul><ul><li>(0.2 x stepping rate) + </li></ul><ul><li>(1.33 x 1.8 x step height in meters x rate) + </li></ul><ul><li>3.5 </li></ul>
  14. 14. ACSM Stepping Equation: <ul><li>To calculate VO2 for bench stepping using a 16 inch step height at a cadence of 24 steps/min. </li></ul><ul><li>16 inches = .4064 meters </li></ul><ul><li>(0.2 x 24) + (1.33 x 1.8 x .4064 x 24) + 3.5 </li></ul><ul><li>VO2= 4.8 + 30.5 + 3.5 </li></ul><ul><li>VO2= 38.8 ml/kg/min </li></ul>
  15. 15. Estimating VO2 from Maximal Bruce Protocol <ul><li>Male: </li></ul><ul><li>VO2 max = 14.76 - (1.379 x time) + (0.451 x time2) - (0.012 x time3) </li></ul><ul><li>Female: </li></ul><ul><li>VO2 max= (4.38 x time) – 3.90 </li></ul>
  16. 16. Estimating VO2 Max from Balke Protocol (max) <ul><li>Male: </li></ul><ul><li>VO2 max= 1.444 x time + 14.99 </li></ul><ul><li>Female: </li></ul><ul><li>VO2 max= 1.38 x time + 5.22 </li></ul>
  17. 17. Estimating VO2 max from Submax Treadmill Protocol (multistage) <ul><li>Use HR and WL data from two or more submaximal stages of treadmill test. </li></ul><ul><li>Client must reach steady-state HR between 115-150 </li></ul><ul><li>Determine slope: (b)= (SM2-SM1)/(HR2-HR1) </li></ul><ul><ul><li>SM1 and SM2 are expressed as VO2 </li></ul></ul><ul><li>VO2= SM2 + b (Hr max- HR2) </li></ul>
  18. 18. Estimating VO2 from Submaximal Treadmill Test (single-stage) <ul><li>Use one submaximal HR and one workload </li></ul><ul><li>Steady-state HR should reach between 130-150 bpm </li></ul><ul><li>Calculate SM VO2 and METS using ACSM equation (remember…1MET= 3.5 ml/kg/min) </li></ul><ul><li>VO2 (male)= SM VO2 (expressed as METs) x (Hrmax-61)/ (HRsm- 61) </li></ul><ul><li>VO2 (female)= SM VO2 (expressed at METs) x (Hrmax-72)/ HRsm –72) </li></ul>

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