The Complete Guide to Interval Training [Infographic]
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The Complete Guide to Interval Training
Targeting Maximum Fat Loss Through High-Intensity Interval Training
High-intensity interval training (HIIT) is a popular form of exercise that combines two of the most effective fat-burning methods.
The first is high-intensity training, which pushes the body to maximum effort to achieve muscle fatigue and maximum oxygen use in a quick burst. The harder muscles work, the more oxygen they require. This is measured relative to one’s VO2 max, which is the highest amount of oxygen your body consumes during exercise. Working your body close to its VO2 max triggers the afterburn effect, where the body continues to consume oxygen (and burn calories) up to 48 hours after the workout (it takes approximately five calories to consume one liter of oxygen).
The second method is interval training, which alternates periods of intense effort with periods of moderate-to-low intensity effort. Interval training boosts metabolism significantly longer than a steady workout of equal or even greater length (for example, a 20 minute workout of alternating high/low-intensity periods burns more calories than a 20 minute workout of stead intensity). Interval training also builds lean muscle tissue faster than steady state training.
By combining the above two principles, exercisers can maximize fat-burning and muscle-building potential through significantly shorter workouts. HIIT maximizes increased metabolic rate, optimizes muscle building and muscle retention during fat loss, and increases calorie burn during and after workouts.
The Science Behind Interval Training
HIIT taxes and maximizes both aerobic and anaerobic fitness, while cardio addresses aerobic only. Aerobic respiration requires oxygen to generate energy in the form of ATP, while anaerobic respiration does not. HIIT affects muscle tissue at the cellular level, actually changing mitochondrial activity in the muscles themselves. Studies indicate as little as 27 minutes of HIIT three times per week produces the same anaerobic and aerobic improvement as 60 minutes of steady state cardio five times per week.
Interval Training Protocols
Interval training protocols differ in terms of length for both high and low-intensity intervals, the ratio of high to low-intensity, and the level of intensity during workouts. Three leading protocols are the Tabata Method, Little Method, and Turbulence Training.
The Tabata Method was developed in 1996 by Dr. Izumi Tabata of Japan. It involves high-intensity spurts at 170% of one’s VO2 max. The workouts total four minutes and involve 20 seconds of high intensity followed by 10 seconds of rest for eight cycles. The recommended frequency of Tabata workouts is between two and four times per week. Tabata is best for those who are already fit and are looking for a workout that requires very little time. The Tabata Method can also be performed with strength training movements.
To implement the Tabata Method, try the following. Start with a three-minute warm-up, then sprint for 20 seconds. Rest (walk) for 10 seconds, then repeat the sprint/walk cycle for a total of eight cycles.
The Little Method was developed by Drs. Johnathan Little and Martin Gibala in 2009. It involves high-intensity workouts at 95% of one’s VO2 max. The protocol calls for 60 seconds of high intensity followed by 75 seconds of low intensity. Repeat for a total of 12 cycles (totaling 27 minutes) up to three times per week.
To implement the Little Method, start with a three-minute warm-up. Cycle for 60 seconds quickly and with max resistance. Follow that with 75 seconds of slow cycling at low resistance, and repeat the fast/slow cycle for a total of 27 minutes. This is best for those at an intermediate fitness level who have 30 minutes to spare.
Turbulence training was developed by exercise physiology researcher Craig Ballantyne. It involves eight-rep weight training sets alternated with one to two-minute cardio sets. The protocol alternates high-weight/low-rep strength training with high-intensity cardio. The maximum 45-minute workouts combine strength training with cardio, and the recommended frequency is three times per week.
To implement Turbulence Training, start with a five-minute warm-up. Perform an eight-rep set of a weightlifting movement (like dumbbell presses) followed by one minute of mountain climbers. Repeat through a full-body routine for 45 minutes. Turbulence Training is generally best for those who have longer to train and are looking to incorporate strength training into their routines.
High-intensity interval training isn’t for everyone. It’s an incredibly effective method for improving fitness in a short time, but it’s also extremely taxing on the body. It’s best to start gradually and incorporate it into your training over time.
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