Interval Training: Burn Calories Fast and Effectively

Burn more calories in less time

Interval training is a vigorous, accelerated workout. It works by alternating short bursts (~ 30 seconds) of intense activity with longer intervals (~ 1 to 2 minutes) of less intense activity and recovery.

Interval training does not have to involve high-impact exercise, jumping movements, or heavy weights.  It can also make exercise more interesting and may be performed just about anywhere, with or without equipment.

Using no equipment:

• walk
• run
• bike
• swim
• jumping jacks
• squats/lunges

Using equipment:

• elliptical trainer
• treadmill
• exercise bike

Benefits of Interval Training

Burn more calories during a session – Vigorous exercise burns more calories.

EPOC (Excess Post-exercise Oxygen Consumption) – burn calories even after workout is over. Oxygen burns calories. As your body recovers from intense exercise it needs extra oxygen to restore a normal resting state. So, extra calories continue to be burned for a long time after the workout

Increase exercise efficiency – Complete an effective workout in less time than a standard workout.

Improve aerobic capacity/endurance – As cardiovascular fitness improves, endurance will increase.

Timing & Intensity

Start with one or two higher intensity intervals during each workout. As endurance improves, increase the challenge.

Interval timing and intensity should be based on either Target Heart Rate (HR) or Rate Perceived Exertion (RPE).

Target HR vs RPE

	Target Heart Rate (HR)		Rate of Perceived Exertion (RPE)
1.	Calculate your maximum heart rate (HR) by subtracting your age from 220.	1.	RPE is an individual factor and a reliable indicator used to monitor exercise intensity.  Pay attention to how your body feels during exercise.
2.	The American Heart Association generally recommends a target heart rate of: ~ 50% to 70% max HR for moderate exercise intensity, ~ 70% to 85% max HR for vigorous exercise intensity.	2.	Perceived Exertion exercise intensity correlates with how hard the activity feels to an individual. What feels like a hard workout for one person may feel like an easy workout to a more fit or energetic individual
3.	Heart medications such as Beta Blockers can suppress HR.  Be careful if using this method. Consider discussing your target heart rate with a doctor or a personal trainer	3.	Two RPE scales are commonly used, the Borg scale (6 to 20) or revised category-ratio scale (0 to 10).  An example of the revised category-ratio scale is below.

RPE Revised Category-Ratio Scale

Scale Indicator Value	Perceived Exertion
0	Rest
1	Really Easy
2	Easy
3	Moderate
4	Somewhat Hard
5	Hard
6	Still Able to Talk
7	Really Hard
8	Rapid Breathing; Cannot Talk
9	Really Really Hard; Difficult to Maintain
10	Max, Hardest: Maximum Effort

How to perform an Interval Training Session

1. Warm up for 5 to 10 minutes.
2. Now, increase the intensity for 15 to 30 seconds.
3. After 15 to 30 seconds at high intensity, resume a normal pace.
4. Finish with a cool down.
5. The first session should be slightly challenging in terms of intensity.

The first session should be slightly challenging in terms of intensity. To what extent you increase intensity during a session is an individual decision. As your capability improves, increase the:

• intensity,
• number of high intensity segments in a session,
• length of the exercise session.

Example: Interval Training on Treadmill

Session 1

1	Warm-Up	5 minutes of of light walking/jogging or dynamic stretching.
2	Sprint	30 second intensity interval at 70% of maximum effort (~ 3 to 5 on RPE scale).
3	Recover	2 minute rest interval, jogging or walking at a decreased pace.
4	Sprint	30 second intensity interval at 80% of maximum effort (~6 to 8 on RPE scale).
5	Recover	5 minute walk at decreased pace.
6	Stretch	Static stretching.
7	More	Add extra intervals as body condition indicates improvement.

Session 2 – Instead of sprinting try increasing the incline on the treadmill to obtain similar results.

1	Warm-Up	5 minutes of light walking/jogging or dynamic stretching.
2	Increase Incline	4 to 5% incline for ~30 seconds producing 70% of max effort (~3 to 5 on RPE scale).
3	Recover	2 minute interval: jogging/walking at decreased pace.
4	Increase Incline	8 to 9% incline (or less, if needed) for ~30 seconds producing 80% of max effort (~6 to 8 on RPE scale).
5	Recover	5 minute interval: walking at decreased pace.
6	Stretch	Static stretching.
7	More	Add extra intervals as body condition indicates improvement.

If you have a health condition or have not been exercising, talk to a doctor before beginning interval training.  To avoid injury be careful not to over-train.