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by Charles Poliquin

Lose belly fat fast and improve your health by doing strength training and high-intensity intervals. Compelling research shows that the BEST way to get rid of the belly fat is to train with hard but short bursts of exercise, a style that taps into the anaerobic energy system more than the aerobic. There is overwhelming evidence that belly fat loss is best achieved when exercise is with a high, but varied intensity, and a relatively large volume. However, this does not mean you have to spend hours and hours a day killing yourself in the gym. Less than an hour a few days a week can produce dramatic fat loss if you do it right.

This article will tell you why you burn more fat when you favor anaerobic-style training and give you eight reasons to favor this style of training by lifting weights and doing sprints rather than spending hours on aerobic exercise.

#1: Burn More Belly Fat with Sprint Intervals

A large number of convincing studies show that high-intensity interval training is the best conditioning strategy for losing belly fat. In contrast, one research group that has conducted a number of experiments comparing aerobic and anaerobic training for belly fat loss write, “Disappointingly, aerobic exercise protocols have led to negligible fat loss.”

The reason anaerobic interval training works so much better is that it requires the body to adapt metabolically—your body is forced to burn fat to sustain the level of intensity being asked of it. It also elevates energy use for more than 24 hours post-workout, which has a dramatic effect on belly fat loss.

For example, a 2008 showed that a 6-week program increased the amount of fat burned during exercise by 12 percent and decreased the oxidation of carbohydrates—obviously, a favorable result for losing fat. More impressive, a 2007 study showed that in as little as 2 weeks, active women who performed interval training experienced a 36 percent increase in the use of fat for fuel during exercise.

Interval training is so effective for fat loss because it taps into different energy pathways than aerobic exercise. Simply, aerobic exercise tends to burn carbohydrates first and activate pathways that are degrading to muscle, whereas high-intensity exercise such as weight lifting and sprinting will burn a greater percentage of fat, enhance the body’s production of enzymes involved in fat breakdown, and activate pathways that lead to muscle development.

The other reason anaerobic intervals are superior for belly fat loss is that they increase excess post-exercise oxygen consumption (EPOC) a huge amount. A 2006 review showed that protocols that are more anaerobic in nature produce higher EPOC values than steady-state aerobic training because the trained muscle cells must rest restore physiological factors in the cells, which translates to a lot of energy expenditure.

#2: Lose Belly Fat With Sprint Intervals: The Proof

The following are examples of the superiority of anaerobic interval training for belly fat loss from the research:

• A 12-week high-intensity interval training program produced a 17 percent decrease in belly fat in overweight young men. Subjects lost 1.5 kg of belly fat and 2 kg of total fat, while building 1 kg of muscle. Fat burning was increased by 13 percent due to the 3-day a week program of 20-minutes of cycling in which the subjects sprinted for 8 seconds and then did 12 seconds of recovery, repeating these intervals for a total of 60 sprints.

• The same 20-minute cycling interval program produced 2.5 kg of fat loss in young women in 15 weeks, and the majority of the fat loss come from the legs and abdominal area. The sprint intervals were compared to a steady-state aerobic program that produced no fat loss.

• A 16-week study had trained athletes perform either a sprint interval protocol or steady-state running four days a week. The sprint interval protocol varied each day, but an example of one of the workouts used was 10 intervals of 30-sec sprints with 90 seconds rest. The sprint interval group lost 16 percent or 1 kg of visceral fat as well as 2 kg of total fat, compared to the endurance group that lost no belly fat, but did lose 1.4 kg of lean mass. The belly fat loss appears to be small, but be aware that subjects were lean, trained athletes to begin with and had less belly fat to lose than overweight subjects.

• An 8-week interval program using both high- and moderate-intensity intervals decreased belly fat by 44 percent in middle-aged men with type 2 diabetes. Subjects increased quad muscle size by 24 percent and improved insulin sensitivity by 58 percent—a dramatic improvement that highlights the other mechanisms involved in belly fat loss (muscle building, insulin health & blood sugar management).

#3: Sprints Take Less Time than Aerobic Exercise

Not only do sprints help you lose MORE belly fat, they help you lose it FASTER and with LESS training time. Repeatedly, studies show that more fat loss is achieved in high-intensity programs that use 20 to 25 minutes of training time than those that use 45 or 50 minutes of aerobic training time.

Scientists write that anaerobic intervals are overwhelmingly preferable to aerobics for producing belly fat loss, and that the estimated optimal dose of aerobic exercise necessary to lose belly fat appears to be 3,780 calories expended per week. This is an enormous volume of exercise that would require 1 hour of moderate intensity aerobic cycling 7 days a week to burn 550 calories a day so that you could lose even a pound a week!

In less than half the time you can get better results with anaerobic training. A 1994 study is indicative of this: Participants did either 20 weeks of aerobic training or 15 weeks of intervals (15 sprints for 30 seconds each) and lost nine times more body fat and 12 percent more visceral belly fat than the aerobic group.

What is so interesting about this study is that the energy cost of the aerobic program over the whole study period was 28,661 calories, whereas for intervals it was less than half, at 13,614 calories. In less time, the interval group lost much more weight—nine times more weight. How do researchers explain it?

Aside from greater fat oxidation and higher EPOC, hormone response plays a major role…

#4: Sprints Improve Hormone Response for More Belly Fat Loss

Sprint intervals and anaerobic exercise in general improve your entire endocrine system. Both training modes enhance the cells’ sensitivity to insulin, making anaerobic training a successful treatment for diabetes.

Perhaps most important, anaerobic exercise also elevates growth hormone (GH) —a powerful fat burning hormone that helps restore tissue and build muscle—much more than aerobic training. GH is released by the body in greater quantities in response to physical stress above the lactate threshold, which is the reason heavy, sprints are so effective.

Another hormone called adiponectin that is released from fat tissue during exercise also helps burn fat. Emerging scientific evidence shows that any time you perform forceful muscle contractions, adiponectin is released, and then your body produces a substance called PGC1 that is like a “master switch” that enhances muscle and metabolic functions, thereby burning belly fat. Naturally, anaerobic training is most effective for increasing adiponectin and PGC1 to burn fat since sprints and especially weight lifting require extremely forceful muscle contractions.

#5: Strength Train to Lose Belly Fat

To get a lean, trim your midsection and lose belly fat, you need to strength train with a high volume, using large muscle groups, and short rest periods. This metabolically intense type of training is fantastic for increasing GH and aiding belly fat loss. This doesn’t mean you have to spend hours and hours a day killing yourself in the gym!

You will get results from a resistance training program that includes the following components:

• Multi-joint lifts such as squats, deadlifts, lunges, split squats, step-ups, chin-ups, and chest presses in every training session. Add isolation exercises only if you have extra time.

• Train with a higher volume—work up to more than 4 sets per exercise. Shoot for 24 to 32 total sets per training session.

• Train with a higher intensity—include some training in the 70 to 85 percent of the 1RM range.

• Include short rest periods (30 to 60 seconds) and always train a “finisher” that requires near maximal effort for more GH response (25 reps of squats or 2 minutes of leg presses, for example).

• Count tempo for every lift so that you apply a specific amount of tension to the muscles. In general, opt for longer (4 second) eccentric tempos and short or explosive concentric tempos.

• Shoot for 3 to 4 hours of total training time per week, which includes resistance training and a few short sprint sessions.

#6: Anaerobic Training Produces Less Cortisol For More Belly Fat Loss

Cortisol is the stress hormone that is elevated when you are under both physical and psychological stress. Research shows cortisol is chronically higher in endurance athletes—one study found that aerobic athletes had significantly higher evidence of cumulative cortisol secretion in their hair than controls.

In addition, cortisol is generally elevated more following aerobic training than anaerobic training. Part of this has to do with the fact that strength training and intervals do elevate cortisol, but they also elevate anabolic hormones such as GH and testosterone that counter the negative effects of cortisol.

If GH and testosterone are not elevated, cortisol overwhelms tissue, having a catabolic effect that leads to gradual muscle loss and fat gain. By doing aerobic training without strength training, you will lose muscle, lower your metabolic, rate, and gain fat. Worst of all, high cortisol causes chronic inflammation, which lead to belly fat gain over time—all-around bad news!

#7: Anaerobic Training Is More Fun & Less Boring than Aerobic Exercise

Intervals and strength training take less time and provide much more variety than aerobic training. Not only are you doing many different exercises in a strength training session, but you are pushing yourself to reach new personal bests. When you see how it can transform a fat belly into a lean, cut midsection, you will be that much more motivated to continue!

In addition, although sprint interval training can be mentally challenging, it only requires a short workout and many trainees find intervals less boring than endurance exercise. Plus, most people enjoy feeling powerful and fast from going all out. Get a training partner to help push you through the hard parts and know that by working hard but smart, you will reach your fat loss goal.

#8: Mix It Up with Modified Strongman, Varied Strength Protocols & Sprints

A few more anaerobic training suggestions include the following:

• Try modified strongman training: Do sled training, tire flips, and a heavy farmer’s walk to lose belly fat fast.

• Mix up strength training protocols with circuit training and supersets that use very short rest periods. For example, do supersets with 10 seconds rest when switching from the agonist to the antagonist exercise and 60 seconds between sets. Or, do a “death circuit” of heavy, high volume deadlifts followed by split squats followed by lighter high volume squats with 10 seconds rest between exercises.

• Try a sprint training workout in which you do 20 second all-out sprints with 10 seconds rest in 4 sets of 4 intervals. Rest 3 to 4 minutes between sets.

• Try hill or stair running in which you sprint up as fast as possible and jog down—repeat immediately. Do 8 to 16 reps.

• Try a sprint-endurance workout with six to eight 200-meter sprints (about 30 seconds each) with a 3 to 4 minute recovery.



References:
Irving, B., Davis, C., et al. Effect of Exercise Training Intensity on Abdominal Visceral Fat and Body Composition. Medicine and Science in Sports and Exercise. 2008. 40(11), 1863-1872.

Boudou, P., Sobnngwi, E., et al. Absence of Exercise-Induced Variations in Adiponectin Levels Despite Decreased abdominal Adiposity and Improved Insulin sensitivity in Type 2 Diabetic Men. European Journal of Endocrinology. 2003. 149(5), 421-424.

Macpherson, R., Hazell, T., et al. Run Sprint Interval Training Improves Aerobic Performance but Not Maximal Cardiac Output. Medicine and Science in Sports and Exercise. 2011. 43(1), 115-121.

Strasser, B., Arvandi, M., et al. Resistance training, Visceral Obesity and Inflammatory Response: A Review of the Evidence. Obesity Reviews. 2012. Published Ahead of Print.

Ismail, I., Keating, S., et al. A Systematic Review and Meta-Analysis of the Effect of Aerobic Vs. Resistance Exercise Training on Visceral Fat. Obesity Reviews. 2012. 13, 68-91.

Heydari, M., Freud, J., et al. The Effect of High-Intensity Intermittent Exercise on Body Composition of Overweight Young Males. Journal of Obesity. 2012. Published Ahead of Print. Boutcher, Stephen. High-Intensity Intermittent Exercise and Fat Loss. Journal of Obesity. 2011. Published Ahead of Print.

Kraemer, W., Volek, J., et al. Influence of Exercise Training on Physiological and Performance Changes with Weight Loss in Men. Medicine and Science in Sports and Exercise. 1999. 31(9), 1320-1329.

Schuenke, M., Mikat, R., et al. Effect of an Acute Period of Resistance Exercise on EPOC Implications for Body Mass Management. 2002. 86, 411-417.

Hottenrott, K., Sebastian, L., et al. Effects of High-Intensity Training and Continuous Endurance Training on Aerobic Capacity and Body Composition in Recreationally Active Runners. Journal of Sports Science and Medicine. 2012. 11, 483-488.

Tremblay, A., Simoneau, J., et al. Impact of Exercise Intensity on Body Fatness and Skeletal Muscle Metabolism. Metabolism. 1994. 43(7), 814-818.

Trapp, E., Chisholm, D., et al. The Effects of High-Intensity Intermittent Exercise Training on Fat Loss and Fasting Insulin Levels of Young Women. International Journal of Obesity. 2008. 32(4), 684-691.

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