Comparison of Actual and Predicted Oxygen Consumption Values

Running Head: COMPARISON OF ACTUAL AND PREDICTED OXYGEN CONSUMPTION VALUES
Comparison of Actual and Predicted Oxygen Consumption Values Lab Report
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COMPARISON OF ACTUAL AND PREDICTED OXYGEN CONSUMPTION VALUES 2
INTRODUCTION
VO2max, the maximum oxygen consumption is the measure of the maximal capacity
of the cardiorespiratory system to not only acquire but also to circulate oxygen to the
functioning muscles (Montero & Díaz-Cañestro, 2015). The circulated oxygen is then extracted
to the mitochondria for respiration. This quantity is thus crucial in quantifying, fitness,
cardio-respiratory characteristics, muscular fitness for both the athletes and patients.
According to Tanner & Navalta (2019) cardiopulmonary exercise test forms a standard basis
of evaluating exercise intolerance for patients with cardiac and pulmonary diseases.
Measurement of VO2 max requires a person to exercise to the volition fatigue. The
method is however not suitable for testing large population or in scenarios where the
participant may be placed in unacceptable health risks as he/she exercises to maximal
exertion (McGawley & Bishop, 2015). The VO2 max measurement used in this report
involves anaerobic exercise test which is an essential component in the establishment of
fitness profiles and exercise prescription (Keteyian et al., 2016). In sports, both the trained
and untrained persons are must establish fitness as well as exercise prescription. In an ideal
case, a maximal test should be applied in the establishment of a full range capacity. The
maximum test is however inherent risks.
Conversion of VE(ATPS) into VE(STPD)
The components of inspired air are comparatively constant. Because of this fact, it is
possible to evaluate the amount of oxygen that is consumed from the measured air by
measuring the composition and amount of expired air. The expired air contains more CO2, N2
and lesser O2 relative to the inspired air. When sampling VE using the Douglass bags, it is
necessary to convert VE(ATPS to VE STPD) (Wingo et al. , 2018). This will take care of the
variations in ambient gases conditions. This necessitates the need to include barometric
pressure and temperature of the laboratory before the conversion calculations.
The following equation is used in the conversion
VE(STPD)=¿
In this case, the correction factor refers to the intersection between room temperature and
barometric pressure.

COMPARISON OF ACTUAL AND PREDICTED OXYGEN CONSUMPTION VALUES 3
For example
Prediction of VO2 (Predicted VO2)
VO2 predicted in this experiment are based on the metabolic prediction equations
published by the American College of Sport and Exercise Science (ACSM). These prediction
formulae make it possible to calculate VO2 when there is no equipment's or if anaerobic
respiration is no the study variable (Houlihan & Malcolm, 2015).
ACSM Walking equation
Exercise VO2 (walking) – for speeds of 50-100 m/min (3 km/h – 6 km/h)
VO2= Resting Component + Horizontal Component + Vertical Component
R = 3.5 ml.kg.min-1 = 1MET (Metabolic Equivalent at rest)
H = Speed (m.min-1) X 0.1
V = Grade (decimal) X m.min-1 X 1.8
VO2 = 3.5 + (S x 0.1) + (G x S x 1.8)
(R) (H) (V)
(S = treadmill speed and G = treadmill gradient
ACSM RUNNING EQUATION:
Exercise VO2 (running) - for speeds > 134 m/min (= 8 km/h)
VO2 = Resting Component + Horizontal Component + Vertical Component
R= 3.5 ml.kg.min-1
H= Speed (m.min-1) X 0.2
V= Grade (decimal) X m.min-1 X 0.9
VO2 = 3.5 + (S x 0.2) + (G x S x 0.9)
NB: Equation cannot be used if running on undulated terrain
ACSM CYCLING EQUATION:

COMPARISON OF ACTUAL AND PREDICTED OXYGEN CONSUMPTION VALUES 4
Exercise VO2 (cycling) VO2 = 7 + 10.8 x Power (W)
Body Weight (kg)
Monark cycle ergometer
Power (W) = Resistance (KG) x Revolutions per minute (RPM)
Objective
1. To refresh testing skills learned in previous laboratories.
2. To determine the accuracy (validity) of prediction equations in estimating physiological
values.
2.1. VO2 CALCULATION (Actual VO2). To be able to:
2.1.1. Collect expired gas.
2.1.2. Analyze it for the content of oxygen and total volume of air, using
appropriate tools/equipment.
2.1.3. Calculation method for conversion from Ambient Temperature and
Pressure Saturated (ATPS) to Standard Temperature and Pressure Dry
(STPD).
2.1.4. To calculate VO2.
2.2. VO2 PREDICTION (Predicted VO2). To determine the accuracy (validity) of
prediction equations in estimating physiological values.