Dizziness during exercise has multiple possible causes. Im a certified personal trainer, but I also consulted with Jacob Teitelbaum, MD (internist), medical director of the Fibromyalgia and Fatigue Centers  nationally, and author of Beat Sugar Addiction NOW!

Ive had clients complain of dizziness during exercise. These were people who werent, lets say, in the best of condition, but otherwise healthy. But at some point during the exercise, they got dizzy. This didnt happen often, though.

Dr. Teitelbaum says, “Exercise can trigger dizziness for number of reasons. These include, most often, dehydration and salt depletion.”

A person whos out of shape or not accustomed to intense exercise may get dizzy simply because their body is not used to the training stimulus of rigorous exercise. Often, these clients did not adequately hydrate themselves, and/or ate poorly in the hours prior to the workout, if at all.

Id work these clients harder than what they were used to, and if they did not have adequate nourishment all day long preceding the workout, it was no surprise that theyd get dizzy at some point during the exercise session.

Another possible cause of dizziness during exercise is the motion during the exercise, such as doing pivoting movements in a step class – these involve half-turns and can cause a little dizziness. Some group fitness classes involve 360-degree turns, and these will cause an inexperienced persons head to spin.

Another potential cause of dizziness during exercise is doing something that requires balancing, like walking on a treadmill without holding onto the rails. Ive had people tell me that if they let go, theyll get dizzy.

The cure for this is to let go but walk very slowly, so that the body doesnt readily sense anything different. As the body adjusts, you increase the speed while still keeping your hands at your sides.

“Less common and more worrisome causes include abnormal heart rhythms and angina,” says Dr. Teitelbaum. Abnormal heart rhythms (arrhythmias) can also cause fatigue and fainting.

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