Question

7.) Your participant is 5’8” and weighs 178 lbs. They completed an exercise bout using arm ergometry with the following parameters:

Flywheel: 2.4 m/rev

Pedal rate: 50 rpm

Work load: 2.0 kp

Duration: 5 mins

1. What is this person’s gross VO2? (2 points)

2. What is this person’s oxygen cost in METs? (1 point)

OPTIONAL EXTRA CREDIT:

You have a client perform the Balke walking test. Using the Balke equation AND the ACSM walking equation, calculate and classify their VO2. Which VO2 do you think is more accurate and why? (4 points)

Male

22 years old

Time on treadmill: 15:23

Classification: ____________

Answer 1

1.Arm ergometry :The arm ergometer (also referred to as an arm cycle or arm crank) is a valuable alternative to the treadmill or leg cycle ergometer for exercise testing. In the arm ergometer stress test, the patient can sit or stand while cranking the arm ergometer.

Persons gross VO2 = (W/Mx 18.0) + none

Where,

W= power output in watts; 1 W = 6 kgm·min-1. d M= body mass in kilograms; 1 kg = 2.2 lb.

Resting VO2 (ml·kg-1·min-1)=+3.5

1. For work rates between 25 and 125 W (150-750 kgm·min-1)  

2. kgm·min-1 = kg x m/rev x rev/min

3. 18.0 ml·kg-1·W-1 = O2 cost of cycling against external load (resistance)  

4. None = due to small mass of arm musculature, no special term for unloaded (zero load) cycling is needed.

By substituting the values in the formula gross vo2 can be calculated.

2.A MET is defined as the resting metabolic rate, that is, the amount of oxygen consumed at rest, sitting quietly in a chair, approximately 3.5 ml 02/kg/min (1.2 kcallmin for a 70-kg person).

The metabolic equivalent of task (MET) is the objective measure of the ratio of the rate at which a person expends energy , relative to the mass of that person, while performing some specific physical activity compared to a reference, set by convention at 3.5 mL of oxygen per kilogram per minute, which is roughly equivalent to the energy expended when sitting quietly.

Conversion of oxygen consumption to METs :

One MET equates to 3.5 ml · kg-1· min-1, therefore dividing the VO2max value by the MET value will convert VO2max into METs.