Lecture 3 (heat) COPY Flashcards
What are the 3 kinds of heat therapy?
Moist hot pack
Parafinn
Fluidotherapy
What is thermal conductivity?
How well heat flows through matter
What is heat?
The speed at which particles are moving
How well heat flows is based on 3 things. What are they?
Intensity of heat applied
Time of exposure to heat
**What is being heated **(sticking hand in oven at 212 degrees is a lot different than a bowl of water at 212 degrees) - this is because water is much more conductive than air is –> water will transfer its heat at a much quicker rate than air will and a solid will transfer heat even faster (depending on the solid)
KNOW:
Things that transmit heat from slowest to faster
Air –> Water –> Sold (depends on solid [metal = faster])
Kinetic motion of atoms / molecules of one object is passed on to another object
Hot object comes into contact w/ another hot object is called
Conduction
What two heat modalities utilize conduction?
Moist hot pack, parafin
Object transmits heat directly to skin
KNOW: w/ conduction the easiest way to remember it is sold coming into contact w/ sold or still object coming into contact w/ still object
* think sticking hand into non-moving water. this would be conduction (still object w/ solid object) because nothing is moving
* The other key to conduction is that the objects must be in direct contact
Bulk movement of moving molecules in lquid or gases is called
Convection (remember that theres movement w/ this)
Convexion = bulk movement of moving molecules in lquid or gases
when it gets hot somewhere those molecules take that heat and move elsewhere
think blood flow throughout the body w/ EX
* say were doing grip isometrics = increased heat in that area –> increased blood in that area and heated w/ conduction then the blood moves (heat moving) = convexion (moving heat) and heat is dispursed throughout the body
EX in a nonpainful area causes the painful area to heat up (which is what we want). Is this conduction or convexion?
Its convexion because those heat molecules are being dispursed around the body
NOTE: if pt comes in w/ a back issue and we want to heat it up it would be beneficial to put them on a bike to do this because were getting that theraputic EX while heating the messed up area (bad part is when pt comes in and depends heat pack)
KNOW: this is more effective for heating the body than just putting a hot pack on (conduction) because this is multiple tissues heating up and dispursing throughout the body.
What is the conversion of heat energy to electromagnetic radiation?
Radiation
Do all objects emit / absorb radiation?
Yes - unless they’re absolute zero
Does ice amit radiation?
Yes, any object above absolute zero. However, it doesnt admit that much
Do we use radiation in PT?
No
KNOW: Convexion is moving fluid particles
If I’m trying to heat the entire body could I use a hot pack? If not what would be ideal to use?
No - isnt big enough
Use THEREX
Does muscle return to baseline quickly after heated / cooled? Why or why not?
Will not because of high water content
Why is muscle tissue able to absorb and hold onto heat better?
Increased water content
* note it also does this with cold
Why does fat take longer to heat up than muscle?
Because it has less water content
What holds onto heat / cold longer muscle or fat?
fat because it has bad bloodflow
KNOW: Muscle has loads of blood flow
What temperature is therapeutic?
104-113
Anything under this is normal body temp
At what temperature does tissue damage occur?
above 122
Does heat increase or decrease elasticity?
Increases it (get more flexible / less ridgid when warm)