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43 terms

Respiratory Physiology

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Respiration Rate: Equation
# breaths/min
Normal Respiration Rate
12 breaths/min
Tidal Volume (TV): Equation
average of 3 normal exhales
Normal Tidal Volume (TV)
500 ml
What does MRV stand for?
Minute respiratory volume
MRV: Equation
TV x respiration rate
Normal MRV
500 x 12
What does ERV stand for?
expiratory reserve volume
What is ERV?
The volume of air that can be forcibly exhaled after a normal expiration
Normal ERV
700-1200 ml
ERV: Equation
average of 3 forced exhales after a normal expiration
What does VC stand for?
vital capacity "gold medal"
What is VC?
the total exhangeable air of the lungs
VC: Equation
TV + IRV + ERV
Normal VC
3100ml-4800ml
What does IRV stand for?
inspiratory reserve volume
IRV: Equation
VC - (TV + ERV)
What is IRV?
volume of air that can be forcibly inhaled following a normal inspiration
Normal IRV
1,900-3100 ml
% predicted VC value: Equation
average VC/predicted x 100
What does RV stand for?
Residual Volume
What is RV?
it is the amount of air remaining in the lungs (1,200) that's can't be voluntarily forced/flushed from the lungs. important for even gas exchange.
RV: Equation
VC x factor
what is the normal factor for teens?
0.25
What does FEVt stand for?
Forced Expiratory Volume.
What is FEVt?
it is like FVC, but it specifically looks at the percentage of the vital capacity that is exhaled during specific time intervals of the FVC test.
FEVt: Equation
A-B
What is FEV1?
the amount of exhale during the first second
FEV1: Equation
(A-C)/(A-B) x 100
What is a healthy percentage for FEV1?
above 75%
What does BMI stand for?
Body Mass Index
What is BMI?
an index of body fat that corrects for height
Normal BMI range
19-25
What is the 1st step?
Body weight (lb) X 0.45
2nd step?
height (in) x 0.025
3rd step?
square the answer to number 2
4th?
step 1/ step 3
1st step RW
Determine % Fat
% Fat = 457/density - 414.2
2nd step RW
Determine FW
FW = BW x % fat
3rd step RW
Determine LBW
LBW= BW-FW
4th step RW
select desired fat percentage (DFP)
5th step RW
compute recommended body weight.
RBW = LBW - (1.0 - DFP)
How do you calculate Max Heart Rate?
220-age