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Mar 22, 2011

For some time now, plyometric training has been used to help athletes reach top physical condition in a variety of sports. Combined with a good strength training program, plyometrics have shown to be one of the most effective methods for improving explosive power. Levels and varieties of plyometric training have also become very popular in the group exercise setting and home based workouts (P90X, Insanity).
What exactly is plyometric training?
A plyometric is an exercise that enables a muscle or a group of muscles to reach their maximum force in the shortest time possible. All plyometrics consist of three phases. Phase one is the eccentric contraction, also known as the pre-stretch in which the muscle is stretched and elastic energy is generated and stored. Phase two is the time between the eccentric phase and concentric phase, also referred to as amortization, which should be very quick. The final phase is the concentric phase which is the actual muscle contraction or shortening. These three phases together are known as the Stretch-Shortening Cycle. An easy way of demonstrating the stretch-shortening cycle is to take a look at two vertical, squat jumps. During the first jump when the person bends his/her knees and hips (eccentric phase – essentially a squat), have them pause for abo

Frequency, Volume, and Intensity?ut five seconds at the bottom before jumping as high as they can (concentric phase). This long delay increases the amortization phase, burning all the stored elastic energy. In the second jump, make the transition from eccentric to concentric (squat to jump) as fast as possible. The second jump will be higher, demonstrating that the shorter amortization phase, the more powerful the contraction.
Now that you have had a brief background on the physiology of plyometrics, here are some tips for designing a program. Normally, 2-3 sessions per week of plyometrics can be performed. It is not recom
mended that plyometric training be scheduled the day after heavy weight training. Alternating upper and lower body plyometrics with upper and lower body strength training can solve this problem. The volume of plyometrics refers to the number of repetitions in each session. For example, with lower body plyos, any ground contact is considered a repetition. If you are just starting plyometrics, you should have no more than 100 ground contacts in a session. Intermediate athletes should be between 100-120 and advanced athletes should be around 140 contacts. Intensity of plyometrics depends on each different exercise. Depth jumps are considered some of the highest when it comes to intensity whereas skipping is classified as one of the lowest. Intensity in a plyometric training program should be based on each person’s ability and should gradually be increased from low to higher intensity. Plyometrics should be performed after the warm-up and before any weight training, when you are still fresh.What else do I need to know?
A word of caution: Knowledge of technique and the ability to properly perform a plyometric is needed before doing this type of exercise on your own.  As with any workout, a proper warm-up is important and should not be skipped. Many people are using plyometrics with high intensity interval training as a way to tax muscles quickly and drive-up heart rates. Which in turn helps you to burn more calories and raise your metabolic rate post workout.  But again, use with caution and with-in your physical ability level. For more information on plyometric training, contact your local FAST® facility, or visit
By Mike Green

Foothills Sports Medicine Physical Therapy

by Foothills Sports Medicine Physical Therapy

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