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14-11-2012




      Fundamentos Fisiológicos del
         Consumo de Oxígeno




                                   Prof. Jorge Cancino L.




• El consumo de oxígeno representa una integración
  entre los sistemas respiratorio, cardiovascular y
  metabólico.
• Es la cantidad de oxígeno que el organismo consume
  por minuto.
  – Puede ser expresado:
     • Como valor absoluto:
         – mlO2/min   o LO2/min
     • Como valor relativo:
         – mlO2/min/Kg




                                                                    1
14-11-2012




Factores determinantes del Vo2




  Factores que intervienen en el
       consumo de oxígeno




                                           2
14-11-2012




                    Principio de Fick


                .
          Vo2 = Q * CaO2 – CvO2


Q = Gasto cardiaco minuto (ml/min o L/min)

CaO2 = Contenido arterial de oxígeno (mlO2%)
CvO2 = Contenido venoso de oxígeno (mlO2%)




                      Gasto Cardiaco




                                                       3
14-11-2012




       VO2 = (FC x VS) x (CaO2 – CvO2)




Como resultado del ejercicio, la FC
submáxima se reduce a cualquier
intensidad de trabajo




                                         vs

Esto podría tener relación con:

Aumento del VS




                                                      4
14-11-2012




El volumen sistólico máximo encontrado en deportistas, es fundamental al
explicar el mayor Vo2 máx en comparación con sujetos menos entrenados




Tanto, la adaptación en los componentes centrales y periféricos están
Implicadas en la mejoría del Vo2 máx.
Sin embargo, existen diferencias individuales en relación a estas adaptaciones




                                                                                         5
14-11-2012




Es posible que la reducción en la
frecuencia cardiaca máxima sea
para evitar la disminución del
gasto cardiaco en esfuerzos
maximales.




                     VO2 = (FC x VS) x (CaO2 – CvO2)




        CaO2 = (1,34 * [Hb] ) *% Sat Hb

                                    Capacidad de O2


   Calcule el CaO2 para un sujeto con 13,5 g% de Hb y que luego de una estadía en
   altura aumenta su Hb a 16 g%




                                                                                            6
14-11-2012




El aumento del Vo2 máx dependerá tanto de
Factores centrales como periféricos.




                  .
            Vo2 = Q * CaO2 – CvO2




                                                    7
14-11-2012




                     Principio de Haldane



        Vo2 = VE * (FiO2 – FeO2)

VE = Ventilación Pulmonar
FiO2 = Fracción inspirada de oxígeno
FeO2 = Fracción espirada de oxígeno




   Calcule el Vo2 de este atleta con los siguientes datos:


   Vt = 2,5 l
   Fr = 38/min

   Fio2 = 20,9%
   Fe02 = 17,4%




                                                                     8
14-11-2012




Evaluación del Vo2.




                              9
14-11-2012




       10
14-11-2012




       11
14-11-2012




       12
14-11-2012




       13
14-11-2012




Relación entre consumo de oxígeno y
METS




                                             14
14-11-2012




  Cinética del Vo2




Cinética del Vo2 máx.




                               15
14-11-2012




Cinética del Vo2 máx.




Cinética del Vo2 máx.




                               16

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Fundamentos fisiológicos del consumo de oxígeno 2012

  • 1. 14-11-2012 Fundamentos Fisiológicos del Consumo de Oxígeno Prof. Jorge Cancino L. • El consumo de oxígeno representa una integración entre los sistemas respiratorio, cardiovascular y metabólico. • Es la cantidad de oxígeno que el organismo consume por minuto. – Puede ser expresado: • Como valor absoluto: – mlO2/min o LO2/min • Como valor relativo: – mlO2/min/Kg 1
  • 2. 14-11-2012 Factores determinantes del Vo2 Factores que intervienen en el consumo de oxígeno 2
  • 3. 14-11-2012 Principio de Fick . Vo2 = Q * CaO2 – CvO2 Q = Gasto cardiaco minuto (ml/min o L/min) CaO2 = Contenido arterial de oxígeno (mlO2%) CvO2 = Contenido venoso de oxígeno (mlO2%) Gasto Cardiaco 3
  • 4. 14-11-2012 VO2 = (FC x VS) x (CaO2 – CvO2) Como resultado del ejercicio, la FC submáxima se reduce a cualquier intensidad de trabajo vs Esto podría tener relación con: Aumento del VS 4
  • 5. 14-11-2012 El volumen sistólico máximo encontrado en deportistas, es fundamental al explicar el mayor Vo2 máx en comparación con sujetos menos entrenados Tanto, la adaptación en los componentes centrales y periféricos están Implicadas en la mejoría del Vo2 máx. Sin embargo, existen diferencias individuales en relación a estas adaptaciones 5
  • 6. 14-11-2012 Es posible que la reducción en la frecuencia cardiaca máxima sea para evitar la disminución del gasto cardiaco en esfuerzos maximales. VO2 = (FC x VS) x (CaO2 – CvO2) CaO2 = (1,34 * [Hb] ) *% Sat Hb Capacidad de O2 Calcule el CaO2 para un sujeto con 13,5 g% de Hb y que luego de una estadía en altura aumenta su Hb a 16 g% 6
  • 7. 14-11-2012 El aumento del Vo2 máx dependerá tanto de Factores centrales como periféricos. . Vo2 = Q * CaO2 – CvO2 7
  • 8. 14-11-2012 Principio de Haldane Vo2 = VE * (FiO2 – FeO2) VE = Ventilación Pulmonar FiO2 = Fracción inspirada de oxígeno FeO2 = Fracción espirada de oxígeno Calcule el Vo2 de este atleta con los siguientes datos: Vt = 2,5 l Fr = 38/min Fio2 = 20,9% Fe02 = 17,4% 8
  • 14. 14-11-2012 Relación entre consumo de oxígeno y METS 14
  • 15. 14-11-2012 Cinética del Vo2 Cinética del Vo2 máx. 15
  • 16. 14-11-2012 Cinética del Vo2 máx. Cinética del Vo2 máx. 16