Aerobic capacity of an individual differs from person to person. An endurance runner who performed TMT (Age: 39 yrs; 4th stage of Bruce Protocol for 12:00 min:s; 13.30 METS, HR rest = 54 bpm; rose to a HR max = 171 bpm which is 94 % of the maximal age predicted heart rate), but the test was stopped due to safety of the athletes. How do we calculate his maximal aerobic capacity from sub-maximal exercise?
Dear Ramananda,
I recommend you use this following formula:
VO2max (ml/kg/min) = 14.76 - (1.379 × T) + (0.451 × T²) - (0.012 × T³) (this formula is the one used for the calculator below)
where the value "T" is the total time completed (expressed in minutes and fractions of a minute e.g. 9 minutes 15 seconds = 9.25 minutes). As with many exercise test equations, there have been many regression equations developed that may give varying results. If possible, use the one derived from a similar population and which best suits your needs.
Note 1: Men: VO2max (ml/kg/min) = 2.94 x T + 7.65 (this formula can be applied for a population to 20 - 59 yrs.
Note 2: You will can use another formula for this.
Vo2max = [0,25 (V)] + (0,95*G) + 3,5] V = velocity (m/min or km/h)
Note 3: It's necessary verify the carachteristics of your patient (cardiopathy, sedentary or active). These formula will should be used for a healthy adult men.
In any way, look the material that I sent to you.
I hope this helps.
http://www.uni.edu/dolgener/Fitness_Assessment/CV_Fitness_Tests.pdf
You can use ACSM metabolic equations to calculate a predicted VO2max from any speed and grade on the treadmill. The only problem is usually submaximal testing assumes a steady state heart rate during the exercise so pick a stage where the heart rate seemed to steady state. It would probably be somewhere in the 3rd stage of the Bruce test if this is a healthy person. The client should be walking at this stage. If an athlete you could use the running equation which would be the speed and grade at the 4th stage. See the ACSM guidelines for the procedure to use these equations. Hope this helps
The relationship between HR and VO2 is linear and highly correlated. I would plot the HR vs VO2 on a scatter plot and use a trend-line to intersect with a horizontal line from the age predicted maximum. The intersection of the two lines will provide a point. If you place a vertical line from the x-axis to this point it will give you a number that can function as a very close approximation.
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