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5 Health Benefits of HIIT

5 Health Benefits of HIIT

By Kelly Burch, Insider

High-intensity interval training (HIIT) involves short, intense workouts. You give a series of exercises your full effort for short bursts of 30 to 60 seconds, and follow it with an even shorter period of rest. While exercising with this type of maximum effort is difficult, it does wonders for your health.

"It's exercise after exercise with minimal rest," says personal trainer Stephen Navaretta, developer of The Tank Method, an exercise program based on body-weight exercises. "This gives your entire body, especially your heart and core, a great workout."

Here are five major health benefits of doing a HIIT workout.


1

HIIT can help you burn more calories

While you're doing a HIIT workout, you're burning about the same amount of calories as you would during a typical workout like running. However, you burn more calories after a HIIT workout than you do during a steady-state cardio exercise like running, where your heart rate remains relatively stable.

A 2019 study confirmed this by having a group of athletes do a HIIT workout and a steady-state run at two different times. Nine minutes after the exercises stopped, researchers found that the HIIT group was burning an average of 3 kilocalories per minute, compared with 2.8 kilocalories per minute after the steady-state run.

This phenomenon of burning calories after you stop exercising is called excess post-exercise oxygen consumption (EPOC). EPOC occurs when your body burns more calories healing the wear and tear from an intense workout. It's common with HIIT workouts because the exercise is so intense, and it has been linked to effective muscle growth.



2

HIIT may help you lose weight

Since HIIT burns more calories because of EPOC, it can be a more convenient way to help you lose weight, since you don't have to spend as much time working out.

A 2019 review in The British Journal of Sports Medicine analyzed 77 scientific studies. The review found that people who did HIIT workouts lost 28.5% more fat than people who did moderately-intense continuous exercise, like running.

"With HIIT, your heart rate stays up for the entire exercise, which is optimal for burning calories, making this an effective option for weight loss," Navaretta says.



3

HIIT builds many muscle groups

Most HIIT workouts involve many different movements. This allows you to work out different groups of muscle during the same workout — for example, a HIIT workout might have you do squats, push-ups, and burpees — which all target different muscles.

The intensity will also help build your muscles and improve their ability to keep working out. "This type of training boosts muscular endurance because the muscles don't get much rest," Navaretta says.

For example, a 2017 study published in Endocrine Connections found that a six-week HIIT program improved muscle power in men, measured by peak power output (PPO). Before the HIIT program, the mens' average absolute PPO was 799 watts, and after the workout it was 865 watts, an increase of about 8%.

Additionally, a 2017 study published in Diabetology & Metabolic Syndrome found that a 12-minute HIIT workout affected the muscles more than a 40-minute aerobic workout for overweight female teens. This was measured by tracking levels of irisin, a hormone released by the muscles in response to exercise.



4

HIIT improves oxygen and blood flow

Your heart pumps blood through the circulatory system in order to deliver oxygen and nutrients to your muscles. And research has found lots of evidence that HIIT workouts can support and even strengthen your circulatory system.

For example, a 2017 study published in the journal Science and Sport split 26 school children into two groups: one group engaged in HIIT training, and one did a more traditional exercise regimen. The study lasted seven weeks. The HIIT group improved their cardiorespiratory capacity, or the ability of their heart and lungs to deliver oxygen to the body, more than the traditional exercise group, and also lost more fat.

In addition, a 2020 study published in the journal of the Federation of American Societies for Experimental Biology found that just one HIIT session improved blood flow to the brain, saying "HIIT is an effective time‐efficient alternative to long‐duration lower‐intensity exercise that offers similar vascular benefits."

Heart disease accounts for one-quarter of deaths in the US, and improving cardiovascular health can reduce your risk for heart disease, making HIIT workouts a great investment.



5

HIIT can help lower blood pressure and blood sugar

HIIT workouts can have many lasting overall health impacts. For example, they can help lower your blood pressure and blood sugar, both of which are risk factors for heart disease.

A 2017 study published in Experimental Gerontology followed 39 men ages 56 to 67 who performed a HIIT workout five days a week for six weeks. At the end of the study, the group had "clinically relevant improvements in blood pressure" — an average reduction of about 5.5 mm/HG.

In addition, a 2017 study published in the European Journal of Applied Physiology found that a session of HIIT resulted in a more immediate reduction in blood pressure than a session of steady-state cardio.

HIIT training can also help control blood sugars, particularly for diabetics. A 2015 study published in the journal of the Public Library of Science found that after 8 weeks of HIIT, people with type 2 diabetes had better control of their insulin levels and better pancreatic function.

In addition, a 2015 scientific review published in Obesity Reviews looked at studies where participants did HIIT regimens for less than two weeks. It found that HIIT helped people with and without diabetes better control their blood sugars than continuous-state workouts.



Takeaways

HIIT workouts allow you to reap many health benefits without needing to go to the gym, or invest in equipment. Navaretta recommends doing a HIIT workout about 3 to 5 times per week.

"The average person is looking to be athletic and toned," Navaretta says. "HIIT training provides endless options for the types of movements that lead to that, as well as benefits like increased flexibility and endurance."

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Health Magazine: 5 Health Benefits of HIIT
5 Health Benefits of HIIT
HIIT is one of the best ways to workout, as you can improve your health by exercising for a shorter — yet more intense — period of time.
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