Aaron and Daphne's Biomechanic Project

biomechanics project.

So this project is about the range of motion of

the elbow joint.

My partner and I shows the motion of an overhand

throw of a softball.

We limited the range of motion through a series of

trials for to be exact, each time, adding more resistance

and recording how far a ball want every time.

We were basically studying how resistance bands affected the distance

of how far a ball could be thrown.

My introduction below is attached to diagrams of the arm,

one of all the bones and the other one of

the muscles.

The primary joint of the overhand throw is the elbow

joint. The humerus, ulna and radius are involved in this

movement and that also the elbow itself.

The prime mover of this throw is the deltoid muscle,

specifically the posterior deltoid and the biceps are antagonists.

The abdominal muscles work as stabilizers and synergistic include the

rotator muscles.

The throw is not just one movement, it's a bunch

of joints, um and muscles working together and all doing

different movements.

Um To create the throw, the wrist has a movement

of flexion of the forearm and an extension of the

shoulder. Now in this movement to measure how much an

arm could fully extend.

We used to go anemometer.

So what is a good anemometer?

It's a tool to measure angles.

Um It has multiple purposes and isn't only used and

throws, but in this lab we used it to measure

the angle of the range of motion from the elbow

joint. The goal anemometer shows how movement can be limited

and the joint.

This movement can be limited in the different planes of

the body.

A prediction of mine coming into the lab was that

when we prevent or Limit the motion of one joint,

that other joints will also be limited or change their

range of motion because all the joints and muscles work

together and if one is limited, the others will be

affected by it.

This is important and leads to what I've learned about

an anatomy and physiology throughout this year, because improper motion

and mechanics can lead to injuries.

Putting stress on certain joints or muscles can over time

lead to deterioration, tears and injuries to decrease this um

effect. You can stretch to increase the range of motion

of certain parts of your body.

In the case of a throw, the more range of

motion you have, the further you will be able to

toss the ball.

The elbow joint Usually has a range of motion of

about 145°..

So now, going to my data and analysis below is

a picture of my subject throwing the softball um overhand

and you can see the resistance band wrapped from his

forearm down to behind his tricep.

So the goni arbiter has two different arms and a

midpoint to basically break down.

Um how to how to use a go in the

open air.

We'll go over here to go nanometer breakdown.

So the end points of the gold anemometer were the

shoulder and the wrist.

There's two different arms of the go nanometer.

One stays in place and one dozen the stationary arm

of the gom.

Jah meter.

I left on the arm.

I attached the end to where the shoulder was and

I attached the body which is the circle part of

the bony ah meter that helps read a joint's range

of motion and degrees at the elbow.

The moving part was attached to my wrist where I

use stickers to market in the video, the stationary part

of my exercise was the arm and the shoulder.

The moving part of the arm was the elbow joint

and the forearm.

I was able to resist the movement by wrapping the

forearm and then going around the arm and shoulder to

restrict the range of motion that the arm could go

in the toss.

The restriction happens at the elbow joint and restricts the

full range of motion of the extension of the arm,

and restricts elbow flexion.

In the picture below it is shown how this restriction

took place.

Mhm. Now, to my conclusion, after completing the multiple sets

of data and analysis and going through the trial, the

four different trials of Trevor or my subject throwing the

softball, I realized when you limit the movement of the

extension of the arm and increase the flexion of the

elbow joint for every throw.

The ball is unable to travel as far of a

distance, and other joints and muscles try to work harder

to substitute for that limited range of motion of the

resisted joint.

A prime example of this is throughout the video, or

the different videos.

As you see Trevor throw or my subject throw with

no resistance 211 resistance band to resistance band, three resistance

band every time his wrist extends more and more.

And you can see he's putting more effort into using

his wrist because the other parts and joints muscles of

his arm aren't working as well, They're being restricted.

Aaron and Daphne's Biomechanic Project

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