Varying your exercise level makes it more effective


Although sustained, moderate exercise has enormous benefits for health, longevity and fat-burning, new research suggests interval training may be even better. How vigorously can you work out? Your answer may predict how long you will live. Varying your exercise level (interval training) is also much more effective for those trying to lose weight.

Researchers (1) have discovered that people who are able to add short bursts of intense activity to their exercise routine live longer than similar aged subjects who who were unable to reach that same intensity level. So whenever you exercise – walk, run, bike or whatever – just throw in a few short spurts of high-intensity effort. It can also boost your fat-burn rate by 36 percent in a couple of weeks!

Surge-training has many other benefits, particularly a high anti-oxidant effect that reduces the effects of aging and improves health.

Chaotic exercise training involves large muscle groups working synergistically in a rapidly changing, unstable environment. This produces far greater benefits in a fraction of the time of any other form of exercise. It better mirrors the natural exercise in the everyday life of our early ancestors, uses more metabolic requirements, increases oxygen consumption and stimulates larger amounts of anti-aging, fat-burning, & healing hormones such as growth hormone and testosterone.

In another study (2) when moderately active women did a 60-minute cycling workout. Instead of pedaling at the same speed for the whole time, they did 4-minute bursts of high-speed pedaling followed by 2-minute rests. In just two weeks they significantly increased their fat-burning power.

An example of interval training would be jogging for a few minutes several times during a long walk. When riding an exercise bike, temporarily increase the resistance level and pedal faster for a few minutes once or twice during your workout.

Physiologist Martin Gibala examined the effects of doing three-minute intervals on a stationary bike. The subjects did 30 seconds of intense pedalling followed by a two or three minute rest, and repeated this five or six times. In 15 to 18 minutes they gained the same muscle-cell adaptations as from an hour and a half to two hour bike ride. (5)

A study (3) found that getting your heart rate up is important in losing weight. Overweight people who cycled or jogged for at least three hours a week had the best outcomes – provided they exercised at a pace that raised their heart and breathing rates. If you are not ready to do anything too strenuous yet, try walking briskly for a couple of hours each week. That’s enough to prevent further fat on your belly.

A small study (4) of a group of men found that those who added short and intense bursts of activity to their workouts were able to metabolise more sugars. Each man did a workout on a stationary bike three times a week – for a minimum of 17 minutes. Their sugar metabolism was measured. In the next part of the study they added a couple of 30-second bursts of high-intensity cycling to their workouts. After the bursts, they rested by cycling slowly for 4 minutes. The result? When the men ate the equivalent of a meal’s worth of glucose, they metabolised it better after the high-intensity training.

Warning. Before doing any intense physical activity, please confirm with your doctor that it is safe for you to do this. Not everyone’s health allows for intense physical activity, particularly when doing it for the first time.
Metabolic Equivalents (METs)

Interval training should gradually increase your fitness. How vigorously you’re able to work out is expressed in metabolic equivalents (METs). One MET is the amount of energy your body uses at rest. METs can be measured by the amount of oxygen your body requires to perform an activity. For example, yoga, walking a dog, and golf expend about 3 METs. Swimming laps, jogging or bicycling more than 15 kph (10 mph) expend around 6 METs. If you can reach at least 85 percent of the MET value predicted for your age group when you work out, then you’re in good shape. If not, increase the intensity slowly to improve your exercise capacity.
References

1. The prognostic value of a nomogram for exercise capacity in women. Gulati, M., Black, H. R., Shaw, L. J., Arnsdorf, M. F., Merz, C. N., Lauer, M. S., Marwick, T. H., Pandey, D. K., Wicklund, R. H., Thisted, R. A., The New England Journal of Medicine 2005 Aug 4;353(5):468-475

2. Two weeks of high-intensity aerobic interval training increases the capacity for fat oxidation during exercise in women. Talanian, J. L. et al., Journal of Applied Physiology 2007 Apr;102(4):1439-1447

3. Inactivity, exercise, and visceral fat. STRRIDE: a randomized, controlled study of exercise intensity and amount. Slentz, C. A., Aiken, L. B., Houmard, J. A., Bales, C. W., Johnson, J. L., Tanner, C. J., Duscha, B. D., Kraus, W. E., Journal of Applied Physiology 2005 Oct;99(4):1613-1618

4. Extremely short duration high intensity interval training substantially improves insulin action in young healthy males. Babraj, J. A. et al., BMC Endocrine Disorders 2009 Jan 28;9:3.

5. Martin J Gibala, Jonathan P Little, Martin van Essen, Geoffrey P Wilkin, Kirsten A Burgomaster, Adeel Safdar, Sandeep Raha, Mark A Tarnopolsky. Effect of short-term sprint interval training on human skeletal muscle carbohydrate metabolism during exercise and time-trial performance. Journal of Applied Physiology, 2006 Sep 15; 575(Pt 3): 901-911. Published online 2006 Jul 6. doi: 10.1113/jphysiol.2006.112094.

Varying your exercise level makes it more effective

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