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Over the last few years there has been a change of emphasis on training routines from long duration low intensity sessions to shorter high intensity sessions. It appears that short is really better for a variety of reasons. Those hours and hours spent on long runs and walks may be less effective for fitness and weight loss. This new trend appears to be a flow on from the proven success of interval training for long events. Short session and interval training involves a set of high-intensity exercise workouts, with intervening rest or low intensity periods. It is also related to hill training techniques and high work rate exercises. Knowing your 'magic pace' is also part of this. Breaking through training plateaus is also a key for improvement.
You may be wasting your time and energy on all those hours you spend running or walking each day when you can get more benefits from short more intense sessions. Boredom, lack of variety and over training can ruin a good training program and weight loss strategy. On the other hand, intense training may have higher risks of injury and some people like their time spent training over long periods of time.
This article reviews some of the recent advice and research studies that review short session workouts, runs, walks, swims and other exercising and their pros and cons.
See all 4 photos Source: Gio JL [CC-BY-SA-2.0], via Wikimedia Commons
See all 4 photos Source: Public Domain
See all 4 photos Source: Public Domain
Burning fat - Level of Intensity and Duration is Best
What forms of exercise (interval vs continuous; low-intensity vs high-intensity) burn the maximum amount of fat? Recent studies that examined subjects training under different durations found that shorter higher intensity sessions burnt more fat. When a single, 60-minute session of exercise was divided onto two, 30-minute long session with 20 minutes of rest in between more of the energy expenditure was derived from fat. Also repeated higher intensity exercise sessions appeared to change the whole body and muscle metabolism to make it more efficient in using both fat and carbohydrate. The researchers recommended breaking up your exercise sessions in to shorter bouts and introducing more variety. This does not necessarily mean eliminating all longer session, but to include weekly bouts of short duration high intensity workouts. Introducing variations in the type of exercise is also a good idea.
The image below shows that the relationship between oxygen consumption and energy expenditure for walking is not linear but increases rapidly at higher speeds.
See all 4 photos Increasing the intensity increases that rate at which oxygen is consumed and energy expendedSource: janderson99: Original Graphic
The table below shows how the calories burnt for various types of exercise varies with intensity. It also shows the total equivalent amount of fat in onces and grams for 90 minutes of the various exercises. For most types of exercises, the calories burnt during 30 minutes of intense activity was equivalent to that consumed by 60 minutes at the lowest intensity rate.
Calories Burnt by Various Exercise Types and Intensities
Exercise | Intensity | Calories for 30 minutes | Calories for 60 minutes | Calories for 90 minutes | Equivalent Ounces of fat for 90 minutes | Equivalent grams of fat for 90 minutes |
---|---|---|---|---|---|---|
Aerobics | Light | 120 | 240 | 720 | 3.3 | 93.3 |
Moderate | 200 | 400 | 1200 | 5.5 | 155.5 | |
Vigorous | 300 | 600 | 1800 | 8.2 | 233.3 | |
Walking | 4 km/hr | 105 | 210 | 630 | 2.9 | 81.6 |
7 km/hr | 200 | 400 | 1200 | 5.5 | 155.5 | |
10 km/hr | 370 | 740 | 2220 | 10.1 | 287.7 | |
Running | 9 km/hr | 320 | 640 | 1920 | 8.8 | 248.8 |
10 km/hr | 350 | 700 | 2100 | 9.6 | 272.2 | |
12 km/hr | 430 | 860 | 2580 | 11.8 | 334.4 | |
16 km/hr | 550 | 1100 | 3300 | 15.1 | 427.7 | |
Cycling | 9 km/hr | 120 | 240 | 720 | 3.3 | 93.3 |
16 km/hr | 220 | 440 | 1320 | 6.0 | 171.1 | |
21 km/hr | 320 | 640 | 1920 | 8.8 | 248.8 | |
Swimming | 25 metres/min | 165 | 330 | 990 | 4.5 | 128.3 |
40 metres/min | 240 | 480 | 1440 | 6.6 | 186.6 | |
50 metres/min | 345 | 690 | 2070 | 9.5 | 268.3 | |
Rowing | Light | 200 | 400 | 1200 | 5.5 | 155.5 |
Vigorous | 420 | 840 | 2520 | 11.5 | 326.6 |
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Everything in Moderation
Various studies have shown that the cardiovascular benefits of vigorous aerobic exercise training appear to peak at about 30-60 minutes daily. Beyond that the benefits of the extra exertion diminish and may even cause adverse effects in some people.
A Danish study found that a group of overweight young men lost more weight exercising moderately for 30 minutes several times a week over a 13 week period than another group that exercised for 60 minute sessions. It appeared that the group of subjects who had longer exercise sessions ate more than the moderate exercisers and were less active generally during the other parts of the day. Motion sensors worn by all of the subjects confirmed these patterns.
The group of men who had 30 minute sessions were more invigorated by their exercise. They were more active during the day and less inhibited by feeling fatigued. The moderate exercise plus all the little bursts of activity, and less food consumption, all added up to help them lose more weight.
Benefits of Short Intense Workouts - The Pros
Time - This is an obvious benefit for people who claim they don't have enough time for exercising. It is much easier to set aside 30 minutes every other day than 60 minutes
Better Return for Effort - If you are going to put your time, sweat and money into equipment and gym costs, you want to have a reasonable expectation that your efforts will pay a dividend in terms of fitness and weight loss. Short intense workouts are likely to provide a better return than slow, lower intensity exercises. It's sad that very slow long walks may achieve virtually nothing in term of fitness because you never get the heart rate up high enough. It will burn calories, but at perhaps half or a quarter the rate of faster walking.
Interest and Avoidance of Boredom - Exercising and working out should be fun and play, not uninspiring drudgery. This is why cross-training and variety are so important. Challenging and vigorous activity is more interesting than a slow 90 minute jog or an hour ob the treadmill.
Performance - Short intense training builds aerobic fitness in a similar way to interval training. The fitter you are the better will be your performance - your times and work capacity. Short, intense exercise sets the foundation for being able to dominate in your sport.
Less Demanding Space and Organisation - If you are committed to a sixty minute jog or bike ride there are limited places where you can so it. Short interval training is much more flexible especially using cross training and variety.
Consistency as You age - As people get older they lose the capacity to work hard for long periods of time. It is easier to maintain a short intense and flexible training strategy over a long period of time as people get older.
Short Intense Workouts - The Cons
Clearly the benefits of short intense workouts mostly apply to relatively fit you people. Sedentary and older people need to ease into it to avoid injuries. For older people there are individual risks that inappropriately high-intensity exercise my induce a heart attack.
The trick is to be sensible about it and to vary the intensity and allow a lot of warm-up and warm-down period before and after the training session. The extreme high-intensity training should not be undertaken until people have at least three months of normal training to get fit and flexible. The best approach is to gradually increase the duration and intensity of the session or to add more interval sessions as you go.
Some people like the meditation and mental benefits of a long run out in the country side, Short intense activity does not provide these benefits. In this case it is probably better to stick with what you like. Perhaps you could add some more vigorous parts into these routines or hills.
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