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23 Cards in this Set
- Front
- Back
1. What 4 factors determine cardiac performance?
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Preload, Afterload, Contractility, HR.
EACH affects *Q |
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2. Differentiate between the term chronotropic and ionotropic.
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Ionotropic-affects contractility(IE. B-blocker), Chronotropic-Time (Rate) motion.
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3. Which of the following represent myocardial oxygen consumption (indirectly)? Q, RPP, SV, EDV, or Vo2?
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RPP. Also called double product is the prevalent measure of MO2 -RPP.
(HR X Systolic BP) |
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4. What influence does SV have on contractility? What influence does coronary circulation have on contractility?
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Coronary circulation increases contractility
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5. What influence does an increased afterload have on performance?
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Decrease
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5b. What type of exercise (endurance training or strength resistance training) has an increased afterload?
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Strength training
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5c. What influence does this type of each type of training have on the heart structure?
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Different type of heart muscle hypertrophy. Both > Vent. Wall muscle. ST (afterload pressure)> Ventricular mass (concentric or layered myfibrils) & hypertrophy. Endurance training(Flow)Series or lengthening myfibrils>left ventrical dimensions w/ less hypertrophy.
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6. What influence does an increased afterload have on MO2?
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Increases it. RPP ^ therefore MO2 up^
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7. Why are static/dyanamic activities dangerous (e.g. shoveling snow)? What kind of effect does this activity have on HR and BP?
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High BP induced very quickly.HR rises quickly. BP & HR highly elevated
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8. What type of effect does an increased myocardial stretch have (preload) on SV?
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Increases SV
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9. What influence does working out at extremely high temperatures (thus sweating) have on preload (and overall exercise performance)?
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Lowers blood volume, ergo reduces SV and performance. (Therefore < Q)
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10. How does muscle help venous return?
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Muscle contraction "pumps" venous blood back toward heart. (Constriction)
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11. What effect does endurance exercise training have on the following:(See following 8 cards).
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See following
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What effect does endurance exercise training have on: Resting HR
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Reduced
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What effect does endurance exercise training have on: Parasympathetic activity at rest
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improved-better relaxation
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What effect does endurance exercise training have on: Sympathetic activity at rest
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Less
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What effect does endurance exercise training have on: Resting SV ?
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increased (ergo lower HR)
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What effect does endurance exercise training have on: Contractility during exercise
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improved
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What effect does endurance exercise training have on: Ventricular compliance during exrercise
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increased
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What effect does endurance exercise training have on: Blood volume
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increase as much as a litre
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What effect does endurance exercise training have on: Hematocrit
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actually goes down as a % due to increased blood volume. improved platelets
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12. How do we calculate Rate Pressure Product?
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RPP= HR X systolic BP
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13. Identify Frank Starling Mechanism
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Relationship between Myocardial stretch and SV is Frank-Starling Mechanism.( As much as 120% improvement from F-S M).
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