(For a quick review of submaximal test options, refer to “Cardiorespiratory Fitness Testing,” Parts I and II, in the September and November–December 2004 PFT 101 columns.) VO 2 or VO 2max can be reported in liters of oxygen consumed per minute (L/min), milliliters of oxygen consumed per minute (ml/min), or milliliters of oxygen consumed per kilogram of body weight per minute (ml/kg/min). VO 2max is predicted from a submaximal test you administer to your client. (VO 2R provides a more accurate estimate of actual exercise intensity than VO 2max precisely because it takes rest into account.) Resting VO 2 is constant for everyone and is equal to 3.5 milliliters per kilogram of body weight per minute. VO 2reserve (VO 2R) is the difference between VO 2max and resting VO 2.
CALORIE CALCULATOR HEART RATE HOW TO
How to Calculate Calories and Intensity Using VO 2reserve The higher the intensity, the more oxygen clients consume and the more calories they burn. In essence, VO 2 is the best indicator of exercise intensity because it is tied closely to energy expenditure. Subjective measures also have their limitations, since it requires some experience with RPE and the talk test to monitor intensity accurately with these methods. Using heart rate to calculate intensity is not as accurate, because increases in heart rate are not always attributable solely to increases in exercise intensity or energy demand heart rate can be affected by other factors, such as stress, medications, caffeine, dehydration, etc. The last method is the most individualized and accurate one because it is based specifically on the metabolic demands of exercise (Swain & Leutholtz 2002). In general, you can determine intensity by employing heart rate methods, such as percent heart rate maximum (%HRmax) or percent heart rate reserve by teaching clients subjective measures, such as the rating of perceived exertion (RPE) or talk test or by converting workload or intensity to oxygen consumption (VO 2). A common inquiry clients often make is, “How many calories am I burning during this exercise?” How do you answer that question so they know how to calculate calories expended? Do you take an educated guess based on a client’s heart rate? Do you rely on the numbers on the treadmill? You can provide a more accurate assessment by calculating exercise intensity.
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