superficial hot modalities Flashcards
hemodynamic effects
vasodilator release, activates cutaneous receptors
vasodilators
histamine and prostaglandin
what happens when cutaneous receptors are activated
smooth muscles relax
- DRG ○ Later on synapsing to lateral gray horn of tc segments ○ Decrease symp adrenegic activation
when you increase temp by 1 degree ncv —- by —-
increases by 2 m/s
effect of hot on demyelinated peripheral enrves
conduction block
hot reduces ___ and ____
- Reduces ischemia and spasm
○ Breaks pain spasm pain cycle
how long should application be for decrease in muscle strength
initial 30 mins
how does thermo alter muscle strength
- Lowered firing rate of alpha motor neurons
Decreased firing rate of: type II muscle spindle efferents and gamma efferents
Increase firing rate of type 1b (GTO)
increase in metabolic rate is seen between ___ and ___ degrees
39 to 43
beyond 45 degrees, what is effect on metabolic rate
enzymatic activity reduced
beyond 50 degrees, what is effect on metabolic rate
○ Enzymatic activities stop
good effect of heat on metabolic rate
- Accelerates healing of chronic wounds
- Shift of o2 dissociation curve to right
○ Makes O2 available for tissue repair
- Shift of o2 dissociation curve to right
bad effect of heat on metabolic rate
- Increase in collegenase activity => destroy articular cartilage
temp and duration for tissue extensibility
40-45 degrees for 10 mins
methods of heat gain
- Conduction
- Convection
- Radiation
hot moist pack storage
70-75 degrees c
hmp is made of
bentonite and hydrophilic silicate gel
terry cloth is equivalent to
4 layers
duration of hmp
15-20 mins
