Tuesday, December 9, 2014

what's your fitness age ?




You already know your chronological age, but do you know your fitness age?

A new study of fitness and lifespan suggests that a person’s so-called fitness age – determined primarily by a measure of cardiovascular endurance – is a better predictor of longevity than chronological age. The good news is that unlike your actual age, your fitness age can decrease.

Fitness age is determined primarily by your VO2max, which is a measure of your body’s ability to take in and utilize oxygen. VO2max indicates your current cardiovascular endurance.

It also can be used to compare your fitness with that of other people of the same age, providing you, in the process, with a personal fitness age. If your VO2max is below average for your age group, then your fitness age is older than your actual age. But if you compare well, you can actually turn back the clock to a younger fitness age. That means a 50-year-old man conceivably could have a fitness age between 30 and 75, depending on his VO2max.

Knowing your fitness age could be instructive and perhaps sobering, but it also necessitates knowing your VO2max first, which few of us do. Precise measurement of aerobic capacity requires high-tech treadmill testing.

To work around that problem, the Norwegian scientists decided several years ago to develop an easy method for estimating VO2max. They recruited almost 5,000 Norwegians between the ages of 20 and 90, measured their aerobic capacity with treadmill testing and also checked a variety of health parameters, including waist circumference, heart rate and exercise habits.

They then determined that those parameters could, if plugged into an algorithm, provide a very close approximation of someone’s VO2max.


Then they checked death records.

It turned out that people whose calculated VO2max was 85 percent or more below the average for their age — meaning that their fitness age was significantly above their chronological years — had an 82 percent higher risk of dying prematurely than those whose fitness age was the same as or more youthful than their actual age. According to the study’s authors, the results suggest that fitness age may predict a person’s risk of early death better than some traditional risk factors like being overweight, having high cholesterol levels or blood pressure, and smoking.

Of perhaps even greater immediate interest, the scientists used the data from this new study to refine and expand an online calculator for determining fitness age. An updated version went live this month. it asks only a few simple questions, including your age, gender, waist size and exercise routine, before providing you with your current fitness age. (I discovered my own fitness age is 15 years younger than my chronological age — a good number but still not as low as I could wish.)

Thankfully, fitness age can be altered, said Ulrik Wisloff, professor at the K.G. Jebsen Center for Exercise in Medicine at The Norwegian University of Science and Technology, who led the study. His advice if your fitness age exceeds your chronological years or is not as low as you would like? “Just exercise.”

But even in advance of this additional data, there is no harm in learning and lowering your fitness age, Dr. Wisloff advised. “There is a huge benefit,” he said, “larger than any known medical treatment, in improving your fitness level to what is expected for your age group or, even better, to above it.”