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Additional Chapter 6 information

Additional Chapter 6 information. Gas Exchange Data 03/07/2011. Gas Exchange and Ventilatory Responses – pg.144. VO2max or VO2peak (difference?) is necessary and is “a powerful marker of prognosis”.

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Additional Chapter 6 information

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  1. Additional Chapter 6 information Gas Exchange Data 03/07/2011

  2. Gas Exchange and Ventilatory Responses – pg.144 • VO2max or VO2peak (difference?) is necessary and is “a powerful marker of prognosis”. • Study: patients with <4.9 METS (17.2 ml/kg/min)had the highest rate of cardiovascular disease and all cause mortatlity as compared to those with higher METS of 5-9.2 (17.5-32.2). For every one MET increase in exercise capacity there is a 12% improvement in survival.

  3. RR = rest 12-15 bpm Ex: 40-50 bpm • >60 bpm = hyperventilation • RER • VE • VCO2

  4. RQ, RER, R: Gas exchange - measured at the mouth not the tissue level. • RER or R = VCO2 production VO2 consumption 75% of O2 consumed is converted to CO2, so what will happen to R during Exercise?

  5. Respiratory Exchange Ratio • RER: Tells what type of fuel we are burning - Fats, CHO, combination of both. • RER = 0.7 predominately fats as a fuel • R = 0.85 – 50% CHO and 50% Fats • RER = 1.0 100 % CHO as a fuel, recent ingestion of CHO. [1,2]

  6. RQ • R = 0.7 - 0.95 Normal Resting Value [2] • R = 1.10-1.20 at max then rises to >1.4 or 1.5 during recovery. R will increase dramatically during recovery as the body tries to eliminate CO2 stores [2]

  7. VE: Represents the volume of air inspired by the lungs in one minute. Ventilation (VE) (L/min) = RR (br/min) x tidal volume (L) For rest conditions, VE (L/min) = 12 (br/min) x 0.5 (L) = 6 L/min For exercise at VO2max, VE (L/min) = 60 (br/min) x 3.0 (L) = 180 L/min

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