here is the whole article
One of the first things I discussed with Dietrich that had me scratching my head was that PIM squats could actually hinder my vertical jump development. ?You gotta squat?, I thought. He explained to me that while the neuro-sequences were similar, the patterns of activation were very different. The more I thought about it the more it made sense. I went back through some of my old training books to see what info I could dig up, and I thought I might share some of what I found.
The first book I looked at was Designing Resistance Training Programs by Fleck and Kraemer. I remembered reading something similar about this topic when I first got the book. So, armed with new knowledge, I went back to take a fresh look at it. Sure enough on page 145 I found a section entitled ?Deceleration Phase and Traditional Weight Training?. I found exactly what I was looking for. Here is the first paragraph:
?The results of many studies (Berger 1963c; Wilson et al. 1993; W.B. Young and Bilby 1993) highlight a problem with traditional weight training and power development. It has been observed that when lifting a weight, the bar decelerates for a considerable proportion (24%) of the concentric movement (Elliott, Wilson, and Kerr 1989). The deceleration phase increases to 52% when performing the lift with a lighter resistance (e.g., 81% of 1 RM) (Elliott, Wilson, and Kerr 1989). In an effort to train at a faster velocity more specific to sport activity, athletes may attempt to move a light weight rapidly during the lift. This increases the duration of the deceleration phase (Newton and Wilson 1993b), as the athlete must slow the bar to a complete stop at the end of the range of motion and therefore does not optimally develop power.?
The authors go on to say:
?Plyometric training and weighted jump squats avoid this problem by allowing the athlete to explode all the way through the movement to the point of load projection (i.e., takeoff in jumping, ball release on throwing, or impact in striking activities). It could be argued that traditional weight training activities promotes development of the deceleration action. The deceleration results from a decreased activation of the agonist during the later phase of the lift and may be accompanied by a considerable activation of the antagonists, particularly when using lighter resistances and trying to lift the weight quickly (Newton et al.1994). This deceleration obviously is very undesirable when attempting to maximize explosive performance. To offset this, a style of lifting must be incorporated that involves ballistic resistance training.?
Steven Plisk, in High Performance Sports Conditioning, also discusses the need for ballistic (RA) training when maximal explosiveness is desired: ?Some individuals have misunderstood the method of submaximal accelerative efforts to mean that they should accelerate light weights through the entire range of motion without releasing them (i.e. , ?speed reps?). Such movements have been shown to be futile because more time is spent decelerating the bar for self protection than accelerating it for beneficial force or power production?(78-79).
These three paragraphs perfectly illustrate Dietrich?s ideas about PIM training being detrimental to power training, and the need to incorporate reactive-acceleration training into a power training protocol. Numerous coaches advocate the use of lighter resistances for speed-strength training development, and many advocate compensatory acceleration techniques of such loads. However, as stated above, without an accompanied load release at the end of the movement you will incorrectly program the nervous system to de-emphasize agonist action at the end of a movement, and actually increase antagonist activation, which creates a faulty pattern of activation, which causes a BIG PROBLEM. We know that increasing velocity at toe-off in the vertical jump or the release point of a throw is the determining factor for a big jump or a 100 mph heater. RA work, or as these authors term it, ballistic lifting solves this problem by allowing the acceleration pattern to be maintained throughout the entire range of motion thus improving acceleration at the end of the movement versus actually hindering it, as traditional PIM methodics do.
Does this mean you should scrap all traditional (PIM) training? Of course not, but it does mean that you need to take a strong look at what is holding your performance back. If you need strength to aid the absorption phase then PIM, ISO, OI, FDA, and ADA methodics can be used to help improve whatever deficiency you may have in this area. What about REA and OSP-REA work, don?t we decelerate the bar at the end of these methods as well? Yes, we do, but the goal with these movements is to train for specific deficiencies in the absorption ? stabilization ? reaction ? acceleration cycle. Remember, we also program these methods with a companion session consisting of RFI and RA work to help preserve proper firing patterns.
The progression we are looking for is to be proficient in the absorption and stabilization phase (ISOs, FDAs, and ADAs). Then, your attention turns to the reaction phase. Failure to adhere to the elements of the cycle will hinder performance gains or worse yet cause injury. Think about it this way, how can you react with a load properly if you cannot absorb and stabilize it first? Improving your ability to quickly absorb and stabilize a load will also greatly aid in the subsequent reactive contraction. According to Mel Siff, a short, quick braking movement in the absorption phase of the A-S-R-A cycle will improve the reactive potential for the movement (Siff Supertraining pg 219).
When you are proficient in the first three phases of the A-S-R-A cycle, then you can turn your attention to the acceleration phase. This brings us back to the main focus of the article, to improve acceleration you must maintain acceleration throughout the entire ROM and actually leave the ground/ release the bar at the end of the movement. I know that many athletes and coaches have had success using CAT techniques but given the research above, it makes me wonder if their results would have been even greater if they implemented their acceleration training in a slightly different manner. As a side note, I think this is why so many coaches bang on the Olympic lifting drum. In the O-lifts when accelerating the bar upwards prior to the catch phase it is not uncommon to see athletes jump during this phase. This is a primary reason for the Olympic lift?s success in developing power versus traditional movements (squats etc…) My problem with Olympic lifting is that the movements are fairly complex to perform correctly. I would rather give an athlete a jump squat which will have a similar effect but is an easier movement to learn. That is a topic for another day though.