Bob, an untrained 40 yr old male is running on the treadmill at 5mph and has the

ID: 3480661 • Letter: B

Question

Bob, an untrained 40 yr old male is running on the treadmill at 5mph and has the following data;

VO2= 2.27L/min

HR =153bpm

Mass = 75kg

His VO2 max = 2.8L/min

2. What is the relative oxygen consumption for him at 5 mph? How many METs is that?

The subject Bob from # 2 trains for 12 weeks on an intensive aerobic training program and increases his absolute VO2 max by 15%. He gets on the treadmill now and runs at the same workload of 5mph. How, if at all, would the following variables change? Explain the rationale of each of your responses.

Question: % of relative VO2max at 5mph

Explanation / Answer

VO2 max is an index of maximal oxygen consumption by an individual during an exercise program.

This gives us an estimate of individual's aerobic capcity and endurance.

Absolute VO 2 (Lit/min)max gives us a value of total O2 consumption whereas relative VO2 max (ml/kg/min)gives us a value per kg of body weight.

Methods of measurement:

VO2 max is measured using following parameters and equipments

Incremental exercise on treadmill/bicycle ergometer

O2/CO2 estimation of inspired and expired air

ventilation

cardiac output

* when O2 consumption becomes static even after increasing workload, VO2 max is achieved.

so For Untrained BOB:

His absolute VO2 MAX is 2.8L/min

His relative VO2 will be Absolute VO2MAX(ml/min)/weight(kg)

=(2800/75)= 37.3 ml/kg/min

MET or metabolic estimation of task gives us an estimation of expenditure of energy by body during various active and passive activities.

1 MET is defined as the energy expensed during rest, it's the resting metabolic rate.

Normally 1 MET is 3.5 ml/kg/min

In this exercise BOB is consuming 37.3 ml/kg/min(Relative VO2)

Therefore it is (37.33/3.5)= 10.6 MET(approax)

Trained BOB

after 12 weeks

His current absolute VO2 max is Higher by 15%

So His current Absolute VO2max is (2.8*115/100)L/min=3.22 L/min

So his new relative VO2max will be 3220/75=42.9 ml/kg/min

considering his previous relative VO2 37.3

Total change is (42.9-37.3)=5.6 ml/kg/min

% CHANGE is approaximately 15%

however considering BOB has lost some body weight during training process(Not mentioned in the question), % change is actually greater than that

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