Cardiovascular System - Relationship between resting values of Heart rate, Stroke Volume and Cardiac Output
- Created by: Jean-Luc Kondabeka
- Created on: 15-05-13 12:20
Fullscreen
Heart Rate - HR
- Represents number of times heart ventricles beat in 1 min
- Average resting heart rate is 70-72 beats per minute
- Max = 220-Age
- Bradycardia - Resting heart rate below 60 beats
- High level of aerobic fitness
- Due to hypertrophy - Increase in size/thickness of heart muscle wall
Stroke Volume - SV
- Volume of blood ejected by heart ventricles per beat/Difference in volume of blood before and after each ventricle contraction
- Average resting stroke volume is approx 70ml
- End diastolic volume - EDV before contraction is the volume of blood left in ventricles at end of relaxation/filling stage of cardiac cycle
- End systolic volume - ESV - After contraction - Volume of blood left in ventricles at end of Contraction/Emptying Stage
- EDV - ESV = SV
Cardiac Output (Q)
- Volume of blood ejected by heart ventricles in 1 Min
- Q = SV x HR
- Litres/min = ml/beat x bpm
Heart's Response to Exercise
Resting
SV - 60-80ml
HR - 70-72 bpm
Q - 5l/min
Sub - maximal
SV - 80/100ml - Untrained
-
- 160/200ml - Trained
HR - 100-130bpm
Q - Up to 10l/min
Maximal
SV - 100-120ml Untrained
160-200ml - Trained
HR…
Comments
No comments have yet been made