Lab 2 prep Flashcards
(34 cards)
cardiac output (Q) calculation
Q = SV x HR
ventilation (Ve) calculation
Ve = Freq x tidal volume
increase demand for energy on total peripheral resistance (TPR)
decreased TPR
- vasodilation
Fick Equation
increased O2 uptake
VO2 = a-v O2 difference x Q
- difference between arteriole O2 and venous O2
- how much O2 is utilized
average # of breathes per min
~16 breaths per minute
average resting Ve (ventilation)
- calculation
8 L/min
- Vt x breaths per min
- 500mL x 16 breaths per min
maximum Ve (ventilation)
150 L/min - 200 L/min
- depending on fitness level
changes in respiration with increasing power output
- Vt and Freq
Tidal Volume (Vt) - linear increase and plateau
Freq
- no initial increase
- linear increase as Vt plateaus
what effects rate of breathing
increase [CO2]
how Ve increases with increase power output
- steady linear increase
- break point
- steeper linear increase
Q at rest
- calculation
Q = 6.0 L/min
- HR x SV
- 75b/min x 80mL/beat
*recreationally trained indv
Q during exercise
Q = 25.0 L/min
- HR x SV
- 200b/min x 125mL/beat
*recreationally trained indv
SV average range
80mL (rest) - 125mL (exercise)
- recreationally trained individual
HR vs. power output
linear increase
- 75-200 bpm
max HR
220 - age
Stroke volume vs. power output
steep linear increase
- early plateau
- lower continued increase in athletes
Q, HR and SV of a world class athlete
Range
- SV ~120- 200mL (avg 80-125mL)
- HR ~50-200bpm (avg 75-200bpm)
Max
- Q ~40L/min (avg 25L/min)
*nearly double
peripheral blood flow
- % to muscle at rest vs exercise
Rest
- 25% goes to muscle
Max Exercise
- 85% goes to muscle
Muscle blood flow (MBF)
- at rest and exercise
rest MBF = 1.5 L/min
- 25% x 6L/min
exercise MBF = 21 L/min
- 85% x 25L/min
Systole and diastole BP
- rest + exercise
Systole
- 120-200
diastole
- 80 (incr/decr w exercise)
mean arteriole pressure calculation
rest
- 2/3 diastole + 1/3 systole
exercise
- (SBP + DBP) / 2
BP calculation
Q x TPR
TPR calculation and avg measures
TPR = MAP / Q
Rest
~16.7 PRU
= 100mmHg / 6L/min
Exhaustion
~4.8 PRU
= 120mmHg / 6L/min
*lowers with exercise
how to calculate VO2 given power output
equation
- calculated avg from data of large sample
- (wont need to know)
VO2 = (0.01141 x PO) + 0.435
