Force/velocity-graph: some practical real life examples

In the post before you have been reading about the value of monitoring the strength training process by simply making a force/velocity-graph and the force/power-graph. For that has been a great step forwards in make the strength training workouts for my athletes more efficient.
That value can be found in:
1.    monitoring the individual development of strength, speed and power
and adapting the program according to the outcome of the tests
2.    comparing different athletes with each other to see individual characteristics.
For both  your will find some real life examples and explanations below, of course I have gathered thousands of these graphs through the years, but I choose these as examples.
In the post before you have seen the development of the force/velocity- and force/power-graphs in free squat in an Olympic sprint medallist.
Here is an example of an elite soccer player that that I used to work with for a few years in terms of conditioning.  Before, he had broken a few bones in his lower leg and got a variety of pins, screws and plates that had recently been taken out again. Now if you think about it: if you take a screw out of a piece of wood, you will find a hole in there. So if you take a screw out of a bone, you will most likely find that too, so don’t load that (right) leg too much…….and here is the result, measured in knee extension.(the right leg is the red F/V and F/P graphs) . A tremendous L/R dysbalance which we balanced out in 2 months.

FV Edgar
Another example in a sprinter (200m 20.19, 100m 10.18): we monitored the F/V graphs throughout the training year and adjust the strength training, share of strength vs. power exercise accordingly and one can see the changes in the F/V graphs, easy to detect in the force part of the graph, at the left side.

FV TDBut as I said, we can also compare athletes. In the next graph you will find three women I coached, two world class 100/200m sprinters (Ottey: 10.74 and 21.64; Onyali: 10.97 and 22.08)  and one world class 800 meter runner (Vriesde 1.56.65). And you can see where I went overboard as a sprint coach coaching the long and boring distance of 800 meters. Vriesde was the strongest of them all and the slowest, (blue line) she could squat a lot, we did not go too high in load too often, but she responded very well to strength training, and since she improved so well, I did not dare to change the program again.MO LV MO FVP

In the last graph you see two world class field hockey players, members of the national Olympic men’s team, that I worked with for conditioning.
Obviously there is the experienced veteran player, Delmee, who could handle a lot of load in strength training and the younger not as experience in strength training, Doherty. The difference in maximal strength and power levels is clear.

FV hockey

Does the F/V graph or the F/P graph explain the differences in performance?
Of course not, there are technical, tactical, and mental components and the influences of endurance. Somebody might be much stronger and having a better F/V graph, but the other athlete might have a much better endurance.
And there is the limitation in exercise, somebody might generate a lot of power in squat, but less power on the track. So: the F/V and the F/P graphs only reveal a part of the total of complex performance factors, but an important one.
No singular test is directly and closely related to performance in competition, I wish that was true since I am still looking for that one single, the “Great Predictor of Success In Competition”. If you found, it, let me know…..

About Henk Kraaijenhof

My name is Henk Kraaijenhof and I started this blog as a random collection of concepts, ideas, stories and events that are important or interesting to me in my work as an international performance consultant in a wide range of fields, and sometimes outside of my work. I will try to post a new entry every 3-4 days. Feel free to comment if you like.
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One Response to Force/velocity-graph: some practical real life examples

  1. mike craven says:

    Mr. Kraaijenhof, your articles have really challenge my thought process in program design. NO- POWERLIFTING AND THE FORCE/ VELOCITY- CURVE. I have some questions that need to be answer for me to be more clear. Does training to improve Power come by improving the Force that can be lifted at an optimum speed. Does the speed of bar come from me applying max force. Example I can squat 500lbs 1 time. If I apply that effort to 350lb bar it should move with higher acceleration than someone who can only lift 360lbs 1 time. Does this mean that Starting Strength or the person who can LEARN to synchronize the highest number of motor units Fast and slow is of great advantage to increasing the watts when a weight is sub maximum between 30%-60%. Also would the rate of force production drop in watts be from Fast twitch units dropping out because of ATP-PC depletion(once recruited losing their energy currency) . Even if I can keep completing more reps than six it is with some fast twitch fibers losing ability to activate as more slow twitch continue set but at less power production. Does this mean zones of intensity70%, 80%, and 90% of your 1rep max have a optimum speed from the 1st rep of set that should be match or the set is stop because of lack of display of power for REPS in that zone. With more sets done no loss of bar speed we would be truly training for increase synchronization and rate coding. I have video of me hitting my best set of 5 reps in the squat with me gutting out the last 2reps that displayed poor technique. At the time it was roughly 93% of my 1rep max. It led to a false since of being meet ready(I BOMB) because doing 5 sets of one I would of felt it was not hard enough or enough of a struggle to activate all of muscle fibers when in reality the fast twitch would of been turn on for all of them.

    Can you have a individual that can have enough limit strength let’s say 2.5 times bodywt but cannot display this when ask to display strength within two tenths of a sec like most sports requiring sprinting and jumping. If the load on the bar does not change but the velocity does then it seems the number of reps in a set can be of wasted effort because of not enough attention to bar speed and adjusting reps to match what is optimum speed. Please let me know a time I could call and talk more about this to you . Thanks Mike

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