Why Do I Get Dizzy After I Work Out?

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Feeling lightheaded, faint, or dizzy after a workout can be scary — not to mention dangerous.

Dr. Clifford Stark, Medical Director for Optum at Sports Medicine at Chelsea, notes that some lightheadedness and dizziness can be totally benign. Other symptoms, however, might be the sign of something more serious.

Why Do I Get Lightheaded After a Workout?

Here are some causes of exercise-induced dizziness and what you can do to avoid it.

1. Increased blood flow to muscles

You are more likely to experience dizziness and lightheadedness when you have done lunges than bicep curls.

Dr. Stark explains the simple cause for this is the size of your muscles:

When exercising, blood flows away from other areas of the body toward the muscles being used
Your quads and hamstrings are larger muscles, therefore more blood is being used
This can result in dizziness and lightheadedness

On top of this, endurance-oriented training involving your quads will get your blood flowing faster to these major muscles.

“Sprinting, jumping, jump squats make your heart rate go way up,” he says. “You’re pumping a lot of blood into your body; you’re sending it back to your heart through the muscle contractions.”

The problem often comes not during the actual workout, but after it’s done.

“If I had you jump 100 times, you’d probably feel fine,” he says. “But when you stop suddenly, your heart is still pumping really hard, but there’s nothing to return the blood to the heart.”

The solution

According to Dr. Stark, this type of dizziness after a workout can be overcome with a good warm-up and a cooldown.

“If you stop, especially if it’s a hard workout, you need to taper off,” he says. “You can’t come down too quickly.”

When in doubt, follow the advice of your high school coach — walk it off.

2. Exercising with low blood sugar

Woman Recovering During Workout | Dizzy After Workout

Many people think training on an empty stomach causes dizziness. This isn’t true, strictly speaking.

Dr. Stark says feeling dizzy after a workout can be caused by low blood sugar, which might be a side effect of training on an empty stomach. On the other hand, overeating can also cause problems when working out.

“If you eat a big meal before a workout,” he says, “your body will see this as a vegetative moment.”

So what’s the right kind and amount of food to eat to avoid dizziness? Dr. Stark says this can be hard to tell, based on your body’s needs as well as the type of training you’re doing.

“There’s no perfect thing to eat before a workout,” he says. “Different people do better on different things. If you go too high on the sugars, you can bottom out in the middle of your workout and get hypoglycemic.”

The solution

All things being equal, Dr. Stark recommends some carbs with some nuts to help sustain the carbohydrate energy.

“You certainly want low volume,” he says. “You want a lot of calories, but not a lot of food. A big meal will inflate inside your stomach.”

Still, he stressed that there’s not one ideal pre-workout meal for everybody.

3. Being dehydrated

Couple Hydrating after workout | Dizzy After Workout

“It’s important not just to rehydrate right after or during a workout,” says Dr. Stark. “You need to hydrate long before.”

He says hydrating as soon as possible is important. The importance of hydrating in advance lies in how the body processes water.

According to Dr. Stark, your body can process a quarter-liter of water every 15 minutes, or a liter of water every hour. Any more than that and the water will just sit in your stomach, making you feel waterlogged and full.

The solution

Dr. Stark believes the average person needs significantly more than the “eight 8-ounce glasses” that’s normally quoted — and active people need even more than that.

To know if you’re getting enough, he recommends you use your urine as a guide. “Keep it as light as you can,” he says, adding that water needs vary from one person to another.

Don’t worry too much about drinking too much water and dropping your sodium levels. Dr. Stark says this is primarily a concern for endurance athletes, such as marathon runners.

4. Extreme strain

Woman Tired After Workout Wiping off Sweat | Dizzy After Workout

Strain can lead to feeling dizzy after a workout. Remember how we talked earlier about stopping quickly?

This is similar to standing up too fast and getting lightheaded, a phenomenon known as “orthostatic hypertension.” A similar phenomenon is vasovagal syncope, which is like when you strain yourself going to the bathroom.

This can also happen, in a more extreme fashion, when you work out.

The solution

The main way to avoid this is to remember to breathe. “Learn the specific types of breathing for each workout,” Dr. Stark recommends.

This is especially true for those lifting heavy weights. Breathing is perhaps one of the most important parts of any movement or exercise. Learn how to do it properly to protect yourself from dizziness and lightheadedness.

What’s more, Dr. Stark says that holding your breath can be counterproductive “unless you’re under water.”

When Dizziness After a Workout Should Worry You

According to Dr. Stark, dizziness that results in loss of consciousness warrants concern, but even more concerning is fainting with no warning signs whatsoever.

“If you have warning signs, that’s actually good as compared to just going out cold,” he says. “Any person who is getting exertional dizziness should get evaluated to make sure that there aren’t other causes.”

If you show any signs of dizziness or lightheadedness, you should see a doctor before continuing or beginning a new exercise regimen.

When it could mean a trip to the doctor

Repeated dizziness and lightheadedness can be worth a trip to the doctor just to make sure everything is working the way it’s supposed to.

“The absolute worst is fainting without warning,” Dr. Stark says.

But if you find yourself getting dizzy or lightheaded at the gym despite eating right, properly hydrating, warming up, cooling down, and breathing the way you’re supposed to, it’s time to make an appointment and find out if the cause of your dizziness is benign or something more concerning.

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