Our lungs and airways are “overbuilt,” according to exercise physiologists. Though we gasp and pant during heavy exercise, that’s not what actually slows us down. Instead, the bottleneck is the heart’s ability to pump oxygen-rich blood to the muscles, or the muscles’ ability to make use of that oxygen. That’s why the heart and muscles get bigger and stronger in response to training, while the lungs stay the same: we already suck in more oxygen than we’re able to use.
Or maybe not, according to a new study in Medicine & Science in Sports & Exercise that takes a fresh look at what it means to be out of breath. It turns out there are different subtypes of breathlessness. Your chest might feel tight; or your breathing muscles might feel overworked; or you might feel that you can’t get enough air in. That last one, sometimes called “air hunger” or (more scientifically) “unsatisfied inspiration” is usually associated with lung conditions like chronic obstructive pulmonary disease. But the new study finds that about a third of healthy adults experience air hunger during all-out exercise—and it’s the…
