Hoi! Dit is een hoorcollege van ageing en concepting. Deze colleges worden gebruikt voor het maken van een betoog als tentamen. Dit wordt gegeven tijdens de minor volwassenen.
Veranderingen hart wanneer je ouder wordt:
- Hartspier gaat verbindweefselen
- Hartwand wordt stugger ( hogere systolische druk)
- Bij lichamelijk inspanning zijn er ook veranderingen: hartslag loopt op bij bewegen.
Veranderingen long wanneer je ouder wordt:
- Verschil in zuurstofdruk in arterie en venen
- Zuurstofopname capaciteit neemt af
- Elastciteit van longweefsel neemt verandert.
Hart:
-Thickening of the aorta and other major vessel walls
-Thickening of lef ventricle and atrium
- Thickening and fragmentaton of tunica intma of arteries
-Thickening Tunica intma leads to narrowing of arteries;
-Narrowing arteries require an increased blood pressure to assure normal blood supply
-Increased blood pressure leads to increased actvity of the lef ventricle
-The lef ventricle becomes hypertrophic
, -Reduced elastcity of older arteries lead to a decreased diameter during systole
-A decreased diameter of the main arteries increases the blood fow
-This is only possible if the blood pressure increases:
-Lef ventricle hypertrophy
-Reduced responsiveness of smaller arteries and arterioles to neurological and/or humoral
signals during physical actvites.
-Blood pressure rises during physical exerton
-Increased workload of lef ventricle
-May lead to hypertrophy
-In elderly persons arteries and arterioles sufer from atherosis: faay deposits.
-Narrowing arteries
-Higher blood pressure
-Lef ventricle hypertrophy
In alle gevallen:
• Increased systolic blood pressure leads to:
- A greater load on the heart due to:
- Increased statc contracton efort of the heart muscle;
- It requires a higher intra ventricular pressure before the aorta valve opens up and
the blood fow into the aorta starts
Hartslag:
-The maximum HR decreases with age
-Exercise training does not afect this
-Classical idea: 220 bpm – Age in years
-Beaer: in persons over 00 years of age: 208 – 0.7 x age in years
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