Cardiac physiology(심장생리)

소개글

Cardiac physiology(심장생리)에 관하여 브래덤, 델리사 등 재활의학 textbooks를 참고하여 정리한 슬라이드입니다.

목차

■ Structure of heart

■ Musculature : endocardium + myocardium + pericardium

■ Characteristics

■ contraction & dilatation

■ cardiac cycle

■ Regulation

■ Stroke volume

■ Oxygen consumption

■ Cardiac output

■ Heart rate

■ Stroke volume

■ Myocardial oxygen consumption

■ Physical inactivity

■ Aerobic training

■ Effect of training on oxygen consumption

■ Effect of training on cardiac output

■ Effect of training on heart rate

■ Effect of training on stroke volume

■ Effect of training on myocardial oxygen consumption

본문내용

■ Regulation
▲ Cardiac output (CO)
* CO = heart rate (HR) X stroke volume (SV)
* normal resting CO : 5L / min
▲ Heart rate (HR)
* parasympathetic Ach : hyperpolarization of SA node, decrease of prepotential
slope
HR decrease
* sympathetic NE : increased repolarization velocity of SA node, increase
prepotential slope
HR increase
diastolic depolarization
■ Stroke volume
▲ intrinsic regulation
* Frank-Starling’s law
increase of venous return increase of EDV increase of SV increase of CO
LV-EDV
Stroke Volume
Normal
Systolic Dysfunction (dilated cardiomyopathy)
Starling’s Law of the Heart
■ Stroke volume
▲ extrinsic regulation
* Sympathetic excitation




■ Effect of training on oxygen consumption
- with aerobic training maximal oxygen consumption is increased, but the oxygen consumption at rest and during any given submaximal load remains unchanged
- increased arteriovenous O2 difference
increased peripheral oxygen utilization
■ Effect of training on cardiac output
- Significant increase is noted in cardiac output at higher work intensities, however, at rest and submaximal work intensities, cardiac output remains the same as that before training
■ Effect of training on heart rate
- Heart rate at rest and submaximal work intensities are actually reduced compared with the untrained state, due to enhanced vagal tone producing cardiac slowing
- The reduced HR allows for longer diastolic filling time.
■ Effect of training on stroke volume

참고 자료

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