ANSWERS | LATEST UPDATE 2024/2025 100%
(GRADE A+)
Cardiac Output
Ans>> The amount of blood the heart pumps through the circulatory system in a minute. The
amount of blood put out by the left ventricle of the heart in one contraction is called the stroke
volume. The stroke volume and the heart rate determine this.
- typically about 5L/min at rest
- will be higher if physically fit (max of 40L/min)
- for unfit, 14-20L/min max
Stroke Volume
Ans>> Refers to the volume of blood that is pumped by the heart with each contraction
- during PA, it will increase until intensity reaches ~50% of VO2 max, then HR will increase the
cardiac output
- for physically fit people, SV is likely to be higher and RHR likely to be lower
Blood Pressure
1
,Ans>> Refers to the pressure blood exerts on walls of blood vessels, and reflects efficiency of
blood flow through the CV system
- systolic: heart contracting
- diastolic: heart relaxing
120/80 is normal
144/94 max safe ranges
normal BP for healthy, active adult is 110/70
- during PA, systolic will rise slightly and diastolic will remain roughly the same
Heart Rate
Ans>> number of heart beats/minute
- RHR average 60-80bpm
- higher RHR for women
- lower RHR with age
Normal Responses to short-term, light-mod Aerobic Exercise
Ans>> CO: Increases rapidly;
2
,plateaus at steady
state within 2 min
SV: Increases rapidly;
plateaus at steady
state within 2 min
HR: Increases rapidly;
plateaus at steady
state within 2 min
SBP: Increases rapidly;
plateaus at steady
state within 2 min
DBP: shows little or no change
Normal Response to Long-Term,
Light to Moderate to Heavy
Submaximal Exercise
Ans>> CO: increases rapidly; plateaus
3
, SV: increases rapidly; plateaus; negative drift
HR: increases rapidly; plateaus; positive drift
SBP: increases rapidly; plateaus; slight negative drift
DBP: shows little or no change
Normal Response to Incremental Aerobic Exercise to Maximum
Ans>> CO: rectilinear increase with plateau at max
SV: increases initially;plateaus at 40-50% vo2 max
HR: rectilinear increase with plateau at max
SBP: rectilinear increase with plateau at max
DBP: shows little or no change
Normal Response to Static Exercise
Ans>> CO: modest gradual increase
SV: Relatively constant at low workloads; decreases at high workloads; rebound rise in recovery
HR: modest gradual increase
SBP: marked steady increase
4