Beetroot Juice: Can It Really Boost Your Blood & Performance?

By Katie Mark Feb 09, 2016

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Mom always told you to eat your beets. As usual, her instruction was on point. The health benefits of beets are well documented, but there’s a new trend on the performance-enhancing block in the form of juice — and not the illegal kind. Beetroot juice is all the rage these days, and it turns out it could be the key to unlocking increased speed and endurance in everyone from weekend warriors to seasoned pros.

Beetroot juice also packs a powerful cardiovascular health punch. That makes it the perfect topic for February’s theme of red: there's Valentine's Day, National Heart Health Month, and of course, February 5th was National Wear Red Day, the American Heart Association’s annual initiative to raise awareness about heart disease and stroke in women. Whether you decide to wear red or drink it, there’s more than one reason to try beetroot juice. We've even created a recipe so you can make your own!

So, what’s the beet deal?

We’re glad you asked. Knocking back a shot of beetroot juice can enhance muscle efficiency by reducing the oxygen-cost of exercise, lowering blood pressure and improving cognitive function. But what’s the hard science behind those claims? In a nutshell, beetroot gets its power from inorganic nitrates — the same kind found in dark, leafy green veggies.

After ingestion, nitrate is converted into nitrite by bacteria in our saliva. In the stomach, some of that nitrite converts to nitric oxide (NO), and the rest is circulated and stored as nitrite in our blood.  Nitrites can be converted into NO during low oxygen availability, which mostly occurs in skeletal muscle during exercise.2

Boost your performance by blood testing

NO is something your body needs: it regulates blood flow, neurotransmission, immunity, muscle contraction, mitochondrial respiration as well as the balance of glucose and calcium.1 All the good stuff.

NO relaxes the muscles by widening blood vessels when it spreads through underlying muscle cells in the arterial walls. This affects how efficiently cells use oxygen -- efficient oxygen use is a very good thing -- and this is one of the reasons why beetroot juice can be used to support sport performance.

The benefits don’t stop there, though. Beetroot juice also contains other excellent nutrients that are great on their own and also act in conjunction with nitrates in beets3, such as:

Fun fact: one study confirmed that it’s actually the nitrates, and not the other nutrients, that are responsible for most of the positive physiological effects of beetroot juice.

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Download recipe card

Beets on the brain

Of course, your muscles aren’t the only critical component of sport performance. Your brain is pretty important, too. Think back to the last time you were exhausted and tried to run a 5k or complete an obstacle course. Chances are, your reflexes — and thus, your results — weren’t exactly sharp.

Beetroot juice benefits the brain, as well. One study investigated whether beetroot juice would increase blood flow to the brain and enhance brain function. 16 male team sport players completed a test twice: drinking a nitrate-rich beetroot juice before the first test, and a placebo juice before their second test.  Beetroot juice was consumed for 7 days, with a bike sprint test administered at the end during which subjects simultaneously completed cognitive tests to evaluate accuracy and quickness of decision-making.

Despite no difference in response accuracy, the beetroot juice improved both sprint performance and speed of making decisions. The study concluded that the dietary nitrate found in beetroot juice can enhance repeated sprint performance and may reduce the decline in cognitive function, which influences reaction time.

Sounds like a pretty compelling reason to have a glass. If juice isn’t your thing and you’d prefer to just chow down on beets as a crunchy snack, it turns out that’s effective too. This study of a group of runners suggests that eating whole beetroot may be as effective in improving running performance as juice.

Are beets best for you?

Not all exercise is created equal, and different activities require different fuel. The same holds true in the case of beetroot juice — its efficacy varies according to a person’s fitness level and the intensity of the exercise.3 Andrew Jones, PhD, a physiologist and “beetroot expert” at the University of Exeter, points out that the effect of beetroot juice on prolonged endurance exercise hasn’t been explored much.

Fast-twitch muscle fibers — used in burst movements and which fatigue more quickly — may be more affected by nitrates than the slow-twitch muscle fibers used in sustained endurance exercise. As for fitness level, it turns out that highly-trained people could have higher blood nitrite values than those who are less trained, which means they might see less of a response to a typical dose of beetroot juice.4

"There is certainly emerging and compelling evidence that the nitrates found in beetroot juice may offer an ergogenic 'edge' to higher intensity aerobic performance. The added benefit is that beetroot naturally contains a hefty dose of other desirable nutrients.”
– Jennifer Sacheck, Associate Professor of Nutrition at the Friedman School of Nutrition Science and Policy at Tufts University 
 

Bottoms up: when, where & how

Now that you’ve decided whether beetroot juice might benefit you, we’re assuming you have a few questions, like:

  • How much beetroot juice is enough to reap the benefits?
  • When is the ideal time to have a sip?
  • And where on earth can you get some?

We have a few answers.

How much: Consuming more beetroot juice does have an effect on blood nitrite levels, but there is less of a return for enhancing performance.1 The optimal amount is 8.4 mmol of nitrate, but 5-9 mmol of nitrate/day is recommended as sufficient enough.3

When to drink:  According to Jones, beetroot juice could yield great effects if taken short-term before competition, from 2-6 days (and up to 15 days). But for acute effects, it should be consumed 2-3 hours before competition.

Where to find it: Beetroot juice supplements and their derivatives are popping up all over the place, and we’re not in the business of endorsing any particular brand, nor evaluating each. That’s why we’ve provided you with our handy, downloadable Beetroot Juice Recipe card, earlier in this post.

If you don’t own a juicer or are always on the go, you might want to check out one of the pre-packaged beetroot products on the market. There are dozens out there, but three we keep hearing about are: BeetIt, BeetElite, used by Spartan Race champion and InsiderTracker fan Amelia Boone, and BeetBoost, a product that InsideTracker athletes like NHL player RJ Umberger are using to improve their performance during grueling pro seasons.  

Of course, you'll still need to test your blood to ensure you're not overdoing it on either the beets or the exercise. We've got you covered.

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A few things to bear in mind:

  • Beetroot juice can turn your urine and stools red (especially in people with iron deficiency) because it contains dark carotenes called betacyanins that aren’t absorbed.5 Fear not — it’s nothing to worry about!
  • People with kidney problems should avoid beetroot juice.Beets contain oxalates that can concentrate in body fluids and then crystallize in kidneys. 
  • Some who consume beets experience upset stomach, diarrhea and nausea. This is because of a substance called betaine.6 It’s one of the reasons why beetroot juice manufacturers make concentrated juice "shots."

Ultimately, experts say nitrate supplementation from vegetables like beetroot juice is unlikely to be harmful3, so drink up!

Boost your performance by blood testing

We know you want to beat your own personal best. That's why we've created this FREE e-book showing you how to get an "inner edge" by harnessing the power of your blood!

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References 

[1] Wylie LJ, Kelly J, Bailey SJ, Blackwell JR, Skiba PF, Winyard PG, et al. Beetroot juice and exercise: pharmacodynamic and dose-response relationships. J Appl Physiol. 2013;115(3):325–36.

[2] Richardson RS, Noyszewski EA, Kendrick KF, Leigh JS, Wagner PD. Myoglobin O2 desaturation during exercise. Evidence of limited O2 transport. J Clin Invest. 1995;96(4):1916–1926.

[3] Jones A. Dietary nitrate supplementation and exercise performance. Sports Med. 2014;44(Suppl 1):S35–S45.

[4] Poveda JJ, Riestra A, Salas E, et al. Contribution of nitric oxide to exercise-induced changes in healthy volunteers: effects of acute exercise and long-term physical training. Eur J Clin Invest. 1997;27:967–71.

[5] Watts AR, Lennard MS, Mason SL, Tucker GT, Woods HF. Beeturia and the biological fate of beetroot pigments. Pharmacogenetics. 1993;3:302-11.

[6] Betaine. (n.d.). Retrieved January 13, 2016, from http://umm.edu/health/medical/altmed/supplement/betaine

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