Cardiovascular Exercise & Weight Loss
Cardiovascular exercise/ aerobic exercise involves
using the same large muscle group (i.e. legs), rhythmically, for a
period of 20 minutes or longer while maintaining 60-80% of your maximum heart rate.
You should be able to carry on a short conversation while doing aerobic
exercise. If you are gasping for air while talking, you are probably
working too hard.
Examples of aerobic exercise include: walking, cycling, jogging/running, rowing, skiing, aerobic classes, rope jumping and swimming. However, some high-impact aerobic exercises may be too intense for beginners and therefore not the best exercise to burn fat. High impact exercises such as rope skipping, jumping jacks and running may not be ideal for those just starting out in their fitness program. There are ways around this, such as using the elliptical or cross trainer in the gym, which burns as many calories as jogging/ running, but isn’t high impact and therefore feels a lot easier for the beginner.
BENEFITS OF CARDIOVASCULAR EXERCISE
Great nutrition combined with the right cardio program is a killer recipe for fat loss. The benefits of adding cardio to your exercise program are truly limitless.
- Burn calories
- Burns Fat
- Increases Metabolism
- Releases “feel-good hormones” – endorphins
- Improves heart function
- Improves lung function – easier breathing
- Improves endurance
- Improves sleep
- Decreases depression, stress and anxiety
- Reduces risk of osteoporosis
- Improves triglycerides and cholesterol levels
CARDIO WORKOUT: DURATION
Aerobic means with air or oxygen and
during aerobic exercise oxygen is continuously delivered to your
muscles. The energy needed for aerobic/ cardiovascular activity is
initially derived from your limited glycogen (carbohydrates) supplies.
When these stores are depleted you body turns to burning fat. This is
why, if fat burning is your goal, you should aim for workout lasting at
least 30 minutes, since fat burning usually occurs after at least 30
minutes of training. Train no longer than 60 minutes, beyond this, your
body reaches a point of diminishing returns, increasing your risk of
injury, over-training and adaptation
If you want to do more cardio, it
is better to add a second session to your day (i.e. morning and
evening).
For maximum fat loss you
generally need to complete 40 – 60 minutes of continuous exercise,
though some people may lose weight doing less cardio. If you have been
leading a sedentary lifestyle you may want to start with 20-minute
sessions and increase duration as you get more fit.
CARDIO WORKOUT: FREQUENCY
For maximum results training 5 – 7 days
per week is best. Again, everyone is different and it may be the case
that you can get away with less. The only way to find out what suits you
best is by trial and error. If you do 4 days a week for 30 minutes and
experience no weight loss you may increase it to 45 minutes per session 6 days a week. It is important that you give your body a rest and take a day off.
CARDIO WORKOUT: INTENSITY
There is a myth that in order to burn
fat, one must train at low intensity for a long duration. It is true
that a greater percentage of the calories burnt during low intensity
exercise come from fat compared to a high intensity workout.
However, you have to remember that if you are working out at a low
intensity your TOTAL amount of calories will be lower compared to a high
intensity workout.
This means that if you walked for 30
minutes, you simply would not burn as much fat as if you had jogged for
30 minutes – even if fat burning is more efficient when you were
walking. This is because you burnt vastly more calories when jogging
that despite the fact that it wasn’t as efficient as walking at burning
fat, you still burnt more “fat calories”.
Example,
Cycle/ low intensity/ burn 100 cal of which 75% cal from fat = 75 fat calories
Cycle/ higher intensity/ burn 250 cal of which 50% cal from fat = 125 fat calories
Cycle/ higher intensity/ burn 250 cal of which 50% cal from fat = 125 fat calories
For sustained weight loss, you have to
burn more calories than you take in. Therefore, trying to focus on
burning fat calories won’t help. Calories are calories – the goal is to
burn as many as possible. Thus, to burn as many calories from fat as
possible you should perform longer duration exercises at a moderate to
high intensity. Basically step the intensity up to as high a level you
are able to sustain for 30 – 60 minutes; this is your “training zone”.
Generally, this tends to be 60% (moderate intensity) – 80% (hard) of
your maximum heart rate.
If you have not exercised for a while, it is a
good idea to start with a moderate intensity and increase it, as you get
stronger and increasingly more fit.
If you are already doing
cardio, DO IT HARDER, increase your intensity. Start with adding 2 – 4
minute intervals at a level or 2 higher than you are currently training.
Gradually increase the time of the higher intensity intervals until you
can do 30 or more minutes at the new higher level. Then, repeat the
cycle.
For Maximum Weight Loss Results, Cardio:
- 5 – 7 days/ week
- 40 – 60 minute continuous workout
- 60 – 80% of your Maximum heart rate
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