Putting Very Little Weight in Calorie Counting Methods

By GINA KOLATA
New York Times

THE Spinning class at our local gym was winding down. People were wiping off their bikes, gathering their towels and water bottles, and walking out the door when a woman shouted to the instructor, “How many calories did we burn?”

“About 900,” the instructor replied.

My husband and I rolled our eyes. We looked around the room. Most people had hardly broken a sweat. I did a quick calculation in my head.

We were cycling for 45 minutes. Suppose someone was running and that the rule of thumb, 100 calories a mile, was correct.

To burn 900 calories, we would have had to work as hard as someone who ran a five-minute mile for the entire distance of nine miles.

Exercise physiologists say there is little in the world of exercise as wildly exaggerated as people’s estimates of the number of calories they burn.

Despite the displays on machines at gyms, with their precise-looking calorie counts, and despite the official-looking published charts of exercise and calories, it can be all but impossible to accurately estimate of the number of calories you burn.

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