The muscle bulging in the Model View window provides an immediate feedback on the overall stres state of the body, but it does not give much detailed information. For detailed investigation of results, the system provides several charting facilities. Here we shall just review the basic functionality: The ChartFX View. It provides the basic ability to make two-dimensional diagrams depicting the results. You can also export the graphs to the clipboard on several different formats or as text for pasting into a spreadsheet.

The first step is to click Window -> ChartFX 2D (new). A new window containing a blank field in the middle and a tree view in the left hand pane appears.

The tree expands to reveal the entire structure of output data generated by AnyBody. Every element in the model generates some form of output from the analysis, so the tree is very large. One of the first nodes you encounter is the MaxMucleActivity variable:

Clicking the node produces an empty cordinate system in the large field. The reason why it is empty is that the standard setting of the ChartFX View is to display time-varying data for moving models. In this simple case our model is static, so it does not make much sense to draw curves. Instead we shall switch the setting to Bar diagrams in by the Gallery button in the toolbar:

 You will obtain the following Image:

This tells you that to stand upright and carry the 50 N load in the right hand, the model is using 4.00e-001 = 40% of its maximum voluntary contraction. This means that the relative load of the muscle with the highest activity in the system is 40% of the muscle's strength. Even though one number is a very simplified way of regarding a system with hundreds of muscles, there are good mathematical reasons why this particular number is a good measure of the human effort of a particular task.

You can obtain more detailed information if you expand the Model branch in the tree view on the left hand side of the bar diagram. Going down through Model -> HumanModel -> Right -> ShoulderArm -> Mus gives you a long list of all the muscles in the right shoulder and arm. A bit down this list you can find the rotator cuff muscle supraspinatus, which tends to be one of the sources of rotator cuff pain. Like many of the muscles in the model, the anatomical muscle supraspinatus is divided into several mechanical branches to account for fibers going in different directions and attaching to different bones. If you open op Supraspinatus_3 you can find the property Fm inside. Click it once, and you should see a new bar illustrating the force in this muscle element similar to the picture below.

This shows that the force in this muscle branch is roughly 18 N. Notice the specification line above the graphics pane marked with the red circle above. This is where the specification of the current picture is listed. You can use this to plot several muscles at the same time. If you change

Main.Study.Output.Model.HumanModel.Right.ShoulderArm.Mus.supraspinatus_3.Fm

to

Main.Study.Output.Model.HumanModel.Right.ShoulderArm.Mus.supraspinatus_*.Fm

i.e. replace the figure 3 with an asterix, '*', then you should see a bar diagram of all the supraspinatus muscles in the right hand side of the body.

All these branches have the same force, which is because they are assumed in the model to have the same strength. However, if you specify:

Main.Study.Output.Model.HumanModel.Right.ShoulderArm.Mus.*.Fm

then you will get all the muscles in the right shoulder and arm:

The different muscles do indeed have very different forces. You can see the muscle name in a little pop-up window if you hold the mouse still over a given bar.

Congratulations! You have just completed your first biomechanical analysis with the AnyBody Modeling System. Now is a good time to play a bit around with the facilities of the system and the model. Try changing the posture and/or the load in the mannequin.any file and investigate the results again.