You may have experienced fatigue during exercise, but what is exercise intolerance?
Ever felt out of breath and tired while pushing through an intense workout? These are signs that the body is working hard to pump oxygen and nutrients to your cells to produce the energy needed for strenuous movement. Exercise intolerance, however, involves extreme fatigue and shortness of breath that is not typical for your age and can occur even during lighter activities. If you have exercise intolerance, you struggle to build stamina, unlike someone who is simply out of shape.
So what is exercise intolerance? “Exercise intolerance is the inability to exercise and engage in physical activity that would be typical for the individual's age,” explains physician Hallie Zwibel, D.O. and Director of the Center for Sports Medicine at the New York Institute of Technology . “It is different from someone being ‘out of shape’ due to not exercising regularly. Individuals with exercise intolerance cannot build the necessary stamina with exercise.
The symptoms of exercise intolerance may sound familiar if you’ve ever challenged yourself during a workout. So what’s the difference? Exercise intolerance is more extreme and occurs during lighter activities or everyday tasks. You may also experience other symptoms like skin discoloration. A lack of oxyhemoglobin, a bright red substance, can make your skin appear blue or purple. Post-exercise fatigue can be debilitating if you have exercise intolerance.
Exercise intolerance is the primary symptom of heart failure. With this condition, the heart struggles to fill up with blood during the relaxed stage of the heartbeat. As a result, the heart transports insufficient oxygen and nutrients to the muscles. When you exert yourself, demand outstrips supply, meaning you may experience symptoms like extreme fatigue.
Chronic fatigue syndromeChronic fatigue syndrome is an often overlooked condition where you experience persistent, extreme tiredness, even when you first wake up. It affects your ability to carry out everyday activities. Strenuous movement like exercise can be challenging for anyone with this condition, according to the American Myalgic Encephalomyelitis and Chronic Fatigue Syndrome Society .
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