Plyometrics, more than jumping onto a box Part 2

Part one we discussed that basic mechanics of what is shown during a SSC. Now in Part II we will look at the optimal ways in which you can train this quality.

What does this say about training reactivity and explosiveness?

The impact of external forces upon ground contact causes a rapid lengthening leading to a stretch reflex. If the muscle is increasing in stiffness (acting isometrically, contracting) but you are still gaining range of motion, then the tendon is what is lengthening. The external forces that cause the body to produce force in this way come in several forms. These all require short ground contact and pretension (muscle rigidity). When the body drops before foot placement, the anticipatory reaction pretenses the muscles witch puts the SEC at somewhat of a pre-stretch. Indicating that drills to develop this capacity should be following a brief landing. Drills that fall in this category:

Double contact jumps: Perform 1 or 2 quick taps with both feet before performing jump.

Continuous jumps/bounds: performing a sequence of jumps with as little ground contact time as possible.

Depth Jumps: Performing a jump from an elevated box with as little ground contact as possible. Box height should never exceed jump height.


What about the good ole’ vertical jump (countermovement)?

In this case, the impact of external forces occurs slowly. This allows the muscle to act eccentrically not allowing the tendon to lengthen as much. This jump would have little to do with reactive explosiveness. In many sports, the case is getting into the air from a running start or rebounding back into the air following a jump, utilizing the methods discussed previously. In many respects the countermovement jump isn’t nearly as “functional” when determining an athletes reactivity and explosiveness.

A Word About Strength
Readiness to perform this type of plyometric work requires a pre-requisite of strength development. In order to get the most stretch out of the tendon the muscle must be strong enough to hold itself isometrically. On a more serious note, if you perform depth jumps and the force greatly exceeds the muscles isometric ability, you will end up with a tear. Again it all comes down to readiness and how advanced you are in your training. A good way to tell if you should progress to the next level is whether the athlete can maintain relatively small hip and knee angles upon landing or rebounding (more upright).

Benefits of progression

This isn’t to say that the countermovement or static jump should be thrown out. These do a great service to build coordination and landing mechanics. An adaptation that reduces co-contraction of the antagonist also occurs. Finally, a static jump is a great companion to starting strength.

Final Note

I hope what you get out of this information is the need to expand across several methods or ways of developing reactivity and explosiveness. By keeping to one method or worse, not doing any plyometrics at all, you are stripping the athlete’s ability to perform at the highest level. Progress, be smart, and stay healthy.

Plyometrics, more than jumping onto a box Part 1

Part I will discuss the basic biomechanics of what goes on during plyometrics.

Reactivity, elasticity, and sometimes referred to as buoyancy, plays a very important role in all sports and running. The ability to change direction, sprint, and jump rely heavily on the body’s ability to produce force, relax, and repeat force production.

Taking a look at common practice through visiting professionals, reading material, and learning from other great coaches, a very common variation in each persons approach to development is how they incorporate plyometrics. I hear a common phrase; “most athletes aren’t strong enough so I don’t do them.” Which I will expand upon more later. Some think it is all about how many inches you can jump onto a box. Opposite of that some think it is all about jumping off the tallest box you can. I will also explain why the common test for explosive power (vertical jump) doesn’t quiet tell the whole story.

What Happens When You Jump?
First and for most lets take a look at the biomechanics that come into play when performing a jump in relationship to the stretch shortening cycle (SSC). Taking a look at Hill’s model, two of the three components make a serious contribution. The contractile element (CE) composed of muscle fibers, and the series elastic component (SEC) mainly being the tendon. When performing a jump, these components are stretched, allowing them to store energy, and this energy is released upon rapid contraction. The tendon has the greatest capacity to store energy with little stretch do to it being a rigid structure. Unlike the muscle, which is supple, can stretch much further without storing the same amounts of energy. This would promote the concept that a greater the ability to stretch the tendon during a SSC, the more energy that can be released. This stretch in the tendon would be optimal if the muscle does not stretch. Basically, the more eccentrically a muscle acts within a SSC the less stretch you get out of the tendon.

In part II we will look at how you can apply this information and the specific exercises that utilize this component of the SSC.

Building a Foundation

Building the foundation for subsequent training means can not be neglected. Being so far away from the next season, it is no better time than now to begin expanding the potential for the work to come. This involves extensive conditioning, tempo work, and assessing postural imbalances very intensively.

The aim of the tempo work is to increase the aerobic capacity for Type II fibers as well as hypertrophy of type I. Here is an example of an upper body tempo exercise protocol we use.

D-Lineman: 6'2" 240 lb
Tempo: 2/0/2
Duration:2-3 series of 3 x 40 sec or 8-10 reps
Rest: 60 sec between sets, 5-8 min active recovery between series

This is his last set. It is very hard for them to control the concentric portion when fatigued so constant supervision and cueing is important to maintain protocol. Always have a stop watch in hand. You can do this after high intensity strength work or in series for a workout on its own.

It is important to remember that this is also the best time to reinforce proper mechanics especially scapular. Important cue to really condition the lower fibers is to make sure athletes are relaxing the upper trapezius. It is key to be hands on so you can feel what they feel. Here is a defensive lineman utilizing these scapular cues during a pull down, ensuring proper activation of the lower fibers.

Optimal Hypertrophy

Size equals strength right? If we get bigger then we are gaining cross sectional area, which is a foundation for strength development aren’t we? Yes and no.

It is very true that increasing the amount of contractile tissue, you will have a greater potential for strength development. But when you gain mass, muscle tissue isn’t the only substance that has ability to grow.

Two types of Hypertrophy

Sarcoplasmic: the volume of sarcoplasmic fluid in the muscle cell increases.

Myofibril: The increase contractile proteins, increase of sarcomeres in series etc…

Any type of hypertrophy is individualized but should never come at the expense of performance. If added mass is essential for an individual, then a balance between both types is optimal. If athlete is already at desired weight or size then any hypertrophy that would be developed should be that of contractile proteins. Lets take a look at the variables that come into play when looking to develop these qualities.

STRESS

Mechanical: Any method that challenges High force or High Acceleration. Goal is to utilize high threshold recruitment (size principle).

Methods: Powerlifting and weightlifting (Olympic)

→Preference for increased size of type II fibers. Heavy eccentrics allow for most muscular damage and highest mechanical stress so don’t limit yourself concentrically.
→Max effort methods offer percentages that yield increase size of high threshold motor units.
→Dynamic lifts will allow you to activate very high threshold MU’s which can be utilized in subsequent strength training.

Metabolic: Methods that induce a local fatigue that will stress aerobic enzymes and substrate causing a reduction as an acute adaptation. During recovery a surplus will be produced as a long term adaptation causing increased size of sarcoplasmic material.

Methods: Bodybuilding, HIT

→Inducing as much fatigue to the muscle is a must. As Zatsiorski would say, if it is not fatigued it was not trained (will not grow).
→Repetition method as seen in Westside Barbell.
→ Timed sets or high intensity training will induce as much metabolic stress with short rest periods. This leads to a beneficial increase in muscle building hormones

As you can see, there are benefits to a variety of methods. It all comes down to what the individual needs. Some athletes fiber composition my lead them to develop hypertrophy better with some methods rather than others. A great way to tell whether or not the size you are adding is beneficial is relative strength.

Random Resources

INTERNETThere is a site that I was told about a while back that basically has me listening, watching, and reading everything it has to offer. The Canadian Athletics Coaching Centre. This has some great articles from many of the greatest minds in the industry like Verkhoshansky, Viru, Zatsiorsky, and Pfaff just to name a few. Much of it is free articles and podcast as well as some amazing videos well worth the money. I urge anyone to check it out for some serious research and programming from every realm of performance enhancement!!

LITERATUREA book that has been around for a bit that I continuously find myself looking back at is Running by Frans Bosch. Bosch has great insight on many aspects in developing, cueing, and training anyone who runs. He is of course a track coach but much of what he has to say can easily be related to any athlete who makes a living on their feet. Especially his work with plyometrics and observation are priceless.

NUTRITIONThe latest from Michael Pollan, Food Rules, is a great gift idea for the health conscious or someone you know that is trying to eat more clean. It is split up into simple sections and does great job at taking simple concepts that often are confused into complexity by the media. Even for those of you who consider themselves having a strong grasp on their stomach my find some of his outlooks as a reminder of some obvious things you are neglecting.

Educational Road Trip

Today I had the pleasure of dropping in at the Sanford Running Injury & Performance lab and The National Institute for Athletic Health & Performance in Sioux Falls, South Dakota. Each of these places offer unique equipment and are heading some great research involving individual assessment through gait analysis and fatigue related stability issues.

At the running lab they had a force plate treadmill with Zebris software. What this allowed them to do was match slow motion video analysis with an individuals foot strike. Along with this they would hook up EMG to get a look at specific firing patterns up the chain. Take away message:

* The individual may display similar areas of stiffness and/or firing patterns but treatment is different based on the way in which this stiffness occurs. This is based off roll off patterns in the foot, heel motion, and foot structure.
* Single leg stance is still one of the greatest assessments for stability. But with this tool you can measure the parameter in which your center of gravity is displaced. This with EMG can show the degree in which you compensate and with which specific muscles your relying on.
* Many people strike hard on the outside of the heel and almost immediate go to big toe after a hard pronation.

Overall like you would assume, many of these people were stiff anteriorly and externally rotated.
These guys had a fellowship with Gary Gray and use some very integrated corrective strategies as you would guess with Gray.

At the NIAHP, they have easily the best environmental chamber in the US. Here they have done wonders with hydration study and stability.

* Almost everyone losses sweat at different rates. With that, what is lost (different electrolytes) varies quiet a bit person to person. People perform at a substantially higher rate when they replace what is really needed and not as much of what is not.
* After fatigued, athletes showed highest differences in stability in the frontal plane when landing, and in step-downs.
* 50 % of athletes are in a dehydrated state throughout the day. (DRINK SOME WATER!)

A great experience overall. Once again these are just tools. You can come to the same conclusions with different means. These tools however provide a great deal of information allowing you to obtain results with the ability to compare with computed numbers. I see these sort of tools as a use em' if you have access sort of thing.

Defending the Trap Bar

The topic that probably found itself ranking at the forefront of discussion in the industry over the last year was the debate over lower body bilateral movements. This includes primarily variations of the squat and deadlift. Its my feeling that if you want to take something away it should be for a couple reasons. One, there are other tools that could be better benefiting you in progress to your goals. Two, it is causing harm to your athletes in the form of injury due to poor pattern or poor risk reward. When I look at the trap bar deadlift I can not find a way to justify these questions. Let look at just a few reasons why it can be such a useful tool...

Using the trap bar to teach movement:
It is all too common to find people who are unstable on the deep squat. Stabilization is timing. A key component in the TBDL is the isometric loading you obtain in the start position. This allows the athlete to consciously gauge the feeling of firing the stabilizers first before going into the squat pattern from the bottom up. Also when put into proper position, the only way to overcome the isometric load is them to activate the global muscles through hip extension. This action of isometric loading to active hip extension will allow you to gain the stability so many athletes lack in the deep squatting pattern.

It is easy to modify:
Not every athlete has the warranted hip mobility that will allow them to pick a heavy load from the ground and maybe they are just to tall to safely pick up the standard sized bar. The best part about bar is that the weight is close to the base of support (your feet) and can be safely elevated. This can allow you to make sure that no matter the athlete, proper spine alignment can be achieved in most cases.
Without a lift many athletes with poor mobility/stability lock the back into extension and also will extend the neck as they attempt to bring shoulder back.









With a couple plates or aerobic boxes, you can easily find a range in which the athlete will not have to compromise mobility to achieve the pattern.








Also a great way to reinforce this movement pattern is to do a toe touch progression within a super-set to compliment this lift.






Scapular Stability:
Lets not forget that this wonderful exercise requires strength, stability, and mobility from all areas. A key area of this stability is one that is often missing in many programs. The scap/thoracic region can be stabilized in two ways. One of them, compression, is commonly seen with things like planks and push ups. The second, distraction, is greatly developed in the TBDL. This is when the scapula has to resist a load from protraction. One can identify this when an athlete lifts too heavy of a load and the shoulder drift anterior.