lecture 3 Flashcards
shockwave and US
the negative pressure wave is called?
Rarefaction wave
2 modes of waves are called?
Transverse waves, Longitudinal waves
the relationship between absorption and penetration is?
Inverse (As absorption increases, penetration decreases, and vice versa)
- if the US head is not moved, a _______ wave could form?
standing
the range of therapeutic US in frequency is from ___MHz to ___MHz
o.75 MHz —— 3 MHz
Intensity for US is measured in ____/cm2?
watts per square centimeter (W/cm²)
What is cavitation?
formation of tiny gas bubbles in a liquid caused by pressure changes
What are the settings most likely to decrease swelling?
Low frequency, low intensity, 20% duty cycle and longer treatment
How does US act “non-thermally”?
they produce little to no heat
What is the purpose of gel in US?
Ensure transmission of waves and reduce air gaps
When considering depth of treatment, which is most important: frequency or intensity?
frequency
What are the contraindications to US?
Pregnancy, cancerous tissues, infected areas
How does the “shape” of the shockwave differ from US?
Shockwaves=sharp, high-pressure peak and rapid
ultrasound= smooth, continuous with lower pressure.
- Shockwave is generally better for conditions which are?
Chronic or musculoskeletal pain
The most common type of shockwave is?
radial shockwave
Unlike US, shockwave does not have a ______ to generate the soundwave?
crystal
What does SEMG actually measure?
Electrical activity
What does GSR measure?
(Galvanic Skin Response) how much sweat is on skin
Why might somebody benefit from down-training?
reduce stress, decrease muscle tension, improve relaxation
What is a commonly “uptrained” muscle?
Upper trapezius
