Swing study

here’s an abstract of a studY I found. It concerns a baseball swing. Now old wisdom is to swing with a heavier bat(load) before you go to the plate because it will suppoably “make you swing faster” Now knowing the braketing technique, using a heavier load AND using a ligther load, Why would coaches only make their players swing with a heavier bat? My theory was Swing with a heavier bat first then swing with a lighter bat so the last thing your body remembers is a very explosive swing. Your thought on my theory

Then I find this study
“The purpose of this study was to determine if warm-up with baseball bats of different moments of inertia has an effect on swing pattern and bat velocity. Ten experienced baseball players (ages 20-25 years) voluntarily participated in this study. Each participant was required to complete 10 dry swings (5 warm-up and 5 postwarm-up) at maximum effort within 3 different conditions. Post warm-up was always with a standard bat (I = .27 kgm2; 83.8 cm, 9.1 N). Warm-up for Condition 1 was with the standard bat. Condition 2 required participants to warm up with a standard bat plus a 6.1 N lead donut (I = .49 kgm2, 83.8 cm, 15.6 N). Condition 3 required participants to warm up with a hollow plastic bat (I = .08 kgm2; 83.8 cm, 3.34 N). Quantitative and qualitative analyses indicated that following warm-up with the weighted bat (largest moment of inertia), swing pattern was significantly altered, and post warm-up velocity was the lowest of the three conditions.”

The last line sticks out, players using a weighted bat had altered swing patterns and lower velocity. So now I’m confused. What do you think? Should one swing with a heavier bat first and a lighter second or vice versa?

Using resistance of greater than 3% unloaded resistance will alter the mechanics of a sport specific action. You must take this into account before validating this study. I believe that your original theory is pretty intuitive and that you should run a study on this to validate your own hypothesis.

i wrote this program on bat speed. this is a paper i wrote about it. people have seen big improvement using this program

Bat Speed

The very first thing a scout looks for when he goes to watch a hitting prospect is whether or not he has bat speed. To a major league scout, the feel that they can teach you to swing your bat their way, but they feel they can’t teach bat speed.  The old philosophy is that it is almost impossible to teach anyone how to increase their speed, whether running, throwing, or hitting.  THIS CAN BE NOTHING FURTHER FROM THE TRUTH.  Yes, you can teach someone the proper mechanics, and yes, you can teach bat speed.  Today, through innovative thinking and technology it is possible to teach someone how to increase the attributes through something known as sport specific training.  
Sports specific training is basically training the body to increase strength and agility for one particular sport.  In our case, we are training to become better baseball players.  Most programs in the past have been implemented to increase strength as a football player.  In this program we are going to implement training programs to make you a better baseball player.  More specifically, a better offensive player.  
Baseball is a game of short bursts and explosions.  In hitting, you want to train your body to improve the short bursts of explosion to maximize bat speed at contact.  There is only one way to teach your body how to maximize this speed.  How do you do it? Go fast.  If you wanted to be an Olympic sprinter, you would not want to run 5 miles a day and not sprint.  This would be teaching your body how to move slowly.  Your body has to be taught to go fast.  Whether it be swinging a baseball bat, throwing, or running.  When you throw a baseball, if you constantly throw a curveball and neglect to throw a fastball, you will be teaching your arms to move slow and not accelerate.  Most coaches teach their kids how to go slow.  
While watching baseball games on ESPN, it isn’t too difficult to figure out that the best hitters in the game have higher bat speeds than the average hitters.  The combination of different forces gives the hitter a higher bat speed.  The first ingredient was mechanics. Others include, flexibility, elasticity, and muscle strength.  Some players will have more raw ability and better genetics to go fast.  However, all players can teach themselves how to go fast.  This is not a genetic trait.  This is a learned process.  
Your body has basically two types of muscle fibers, fast twitch muscle fibers and slow twitch muscle fibers.  Most players don’t completely utilize or train their fast twitch muscle fibers. This program is designed to break down your muscle fibers and rebuild them again.  Slow twitch muscle fibers are the muscles we use every day.  Walking, jogging, or weight lifting are examples of using fast twitch muscle fibers.  
This system is similar to a weight lifting program.  You want to lift chest on a certain day so you can tear down those muscle fibers.  You want to let them rest for a couple of days so you can recover and rebuild.  This is how you form new muscle fibers.  Except with this program you will break down both the fast pitch muscle fiber and the slow pitch muscle fiber to grow a faster, stronger muscle.  
To increase your speed or any other explosive movement, it is scientifically proven that you must use weight approximately 25 percent heavier and 25 percent lighter than your usual weight.  That is what is known as overload/underload training.  This type of training is done for most sporting events.  For instance, Olympic sprinters are doing whatever they can to increase their speed. For a sprinter to use overload training, he/she will sprint with a parachute behind them.  The next day a sprinter may sprint down a steep hill to teach their body to go faster.  The same principal holds true for a boxer.  The boxer will punch a heavy bag to work on his power punches, and later in training he will use the speed bag to work on the quickness of his punches.  
The big question here is what does and overload/underload program mean to a baseball player.  By utilizing an overload/underload training program, a hitter can increase bat speed by huge amounts.  The correct combination of the two will place the hitter to go faster than what he started at.  In the bat speed program we have designed, it is not uncommon for batspeed to increase 15 mph in 3 months.  We have seen as much as 27mph improvements in just a 5 week period.  
Many players want to know what improvement bat speed will do for their performance.  The first thing that increased bat speed will do is increase the impact on the ball.  There is a direct correlation between higher bat speed and hitting the ball harder.  On average, for every mph of bat speed, the ball will travel 5 feet.  Therefore, if a player has increased his bat speed 15mph, he has increased his ability to hit the ball an extra 75 feet.  This is a big difference. This is the same reason A-rod can hit the ball 500 feet.
Increased bat speed will give the hitter more time to see the pitch. This is because the player does not have to start as soon.  As we all know, the longer you have to decide on a pitch, the more successful you are going to be.  
Bat speed will also give the hitter more margin of error.  Because this player is swinging at a higher rate of speed, he will not have to be as precise on his swing.  This will mean that balls struck off center, not on the sweet spot, will travel further.  It would be great if a hitter could always hit the ball on the sweet spot, but this is not always the case.  If the ball is not stuck on the sweet spot, it will have a greater chance of being hit hard for an extra base hit.  How many times have you seen a big leaguer break a bat but still hit a homerun? 
As a hitter, knowing that he has above average bat speed, he will automatically be more confident.  Confidence is the key to hitting.  Many legends have gone on to say that baseball is 90 percent mental.  Without confidence, you will not succeed.  Having more confidence knowing you have more bat speed, the player will learn to trust his body and hands.  This will lead to the player having little or no mechanical flaws.
In high school, the player who earns the scholarship is the player who develops faster.  Some players will develop later in life, but this might be after he was cut from his high school team or cut as a freshman in college.  You can train your body to develop bat speed faster than your teammates or players on the opposing team.  If your whole team uses this bat speed program since their freshman year, you will probably have one of the best hitting teams in the state their junior and senior year.  This is because your team will have an edge on the opponent and that is what the key to championship teams are.
The key to the bat speed program is not just to swing these bats.  The purpose is to swing these bats in an arrangement to maximize the breakdown of muscle fibers.  The program is set to change from day to day.  You want to shock your muscles with the daily workload.  If you constantly change the workload, your body will not be able to be accustomed to a specific workout. This will shock your muscles and lead to more growth.
The theory of more is better is out the door.  If a person lifts more weights he will hit a barrier.  This means that the player will have an increase in the first month or so then stop.  He will hit a wall and not be able to increase after that. The key to this system, is the player will have varied his program to keep improving for a long period of time.

http://www.batspeed.com/

The demonstrator in the video is someone I used to work with. He played in the Houston Astros system. Very smart. John Elliott. The original teacher is a local coach in souithern Cal. I played in the minors tooooo long ago. The video was very informative. If you teach hitting and have a good understanding of the MANY mechanical differences that hitters can have, you will appreciate it. Look at the way Ted Williams would swing, and this ties some of that in. But not a topic I would normally discuss here.

The problem with this study is that the difference between the standard bat and the heavier and lighter bats was too large.
If your standard bat is 30 oz., try using a 24 oz. light bat and a 38 oz. heavy bat.
Make sure to go with different weight bats, don’t simply add donuts to the bat to increase weight.

ok but what does everyone think of my theory of swinging with a heavier bat then swinging with a lighter one to teach swinging faster

Your theory will work if the bat weights are right and you use the appropriate protocols. However, I would look at the use of weighted bats as a training tool, not as a way to transiently increase bat speed.