Biomechanics Final

One Point v Two Point Calibration

One Point v Two Point Calibration

One point calibration sets the device to one known point(like tarring a scale so that its new baseline is zero). Two point calibration uses two known values to calibrate the instrument(goinameter).

Accuracy v Precision

Precision checks to see how far apart the measured values are(think standard deviation). Accuracy checks to see how close the measured values are to known values( percent error kinda)

When should calibration occur (sensor is on/off the device)

Sensor off the device, to ensure that the values used to calibrate are the most accurate they can be and aren’t altered by the device in any way.

Proper use of load cell(force transducer)

The screws need to be pulled apart-not pushed together

Mechanism for air muscle contraction

As you increase the pressure(air) in the muscle, it contracts and shortens. To make it longer, you release the pressure.

Air Muscle Controlled Variables + Limitations

Pressure max, range of motion was small

Electrodes Used

Two Pos(CH1) on bicep, Two neg( CH2) placed the tricep. Earth/Reference placed on the wrist that wasn’t being used.

What operation was used to produce meaningful EMG data

Integration

If unable to measure release angle when throwing a ball, what accommodation and assumption can be made in order to calculate release velocity?

The height of release was the same throughout all trials, angle was parallel to the ground at release

Independent/Dependent variables in tension

Independent: Time, mass added

Dependent: Change in length

Independent/Dependent variables in compression

Independent: Weight Applied

Dependent: Change in width, change in height

Gelatin

Has the same amino acid sequence as collagen, used as a model of an implant composed of a naturally derived polymer.

Glutaraldehyde

Disinfectant? IDK I googled this one

Blue Dextran

The “drug” being released

Trypsin

Used to model the bodies digestion, as its digestion ability affects many proteins.

Sterilization Methods

Bleach-disposal of liquids

BSC/Culture Hood-Aseptic technique

Ethanol- Used to sterilize going in/out of the hood

Autoclave- Sterilize materials to be used for aseptic technique

How do Cells Adhere?

Integrins bind to extra-cellular proteins in vivo. In vitro proteins adhere first, then the cells interact and Adhere to the proteins.

Paraformaldehyde

Used to control the crosslinking of the polymer

How to find elastic modulus from stress-strain

In elastic region, change in stress/change in strain

Poisson’s ratio

-(transverse/axial)