Komentarze do: Why Does Heart Rate Increase Immediately After Sitting Up From The Supine Position? http://www.zastawka.pl/why-does-heart-rate-increase-immediately-after-sitting-up-from-the-supine-position/ Choroby serca poradnik dla chorych i zdrowych Sat, 03 Jan 1970 18:17:13 +0000 hourly 1 http://wordpress.org/?v=3.2.1 Autor: HeartDoc http://www.zastawka.pl/why-does-heart-rate-increase-immediately-after-sitting-up-from-the-supine-position/comment-page-1/#comment-579 HeartDoc Thu, 01 Jan 1970 08:25:07 +0000 http://www.zastawka.pl/why-does-heart-rate-increase-immediately-after-sitting-up-from-the-supine-position/#comment-579 The main reason, as you suggest, is that the BP drops. The body compensates by (among other things, such as constricting the blood vessels) increasing the heart rate. The BP drops because with sitting up, gravity now pulls blood out of the chest, decreasing its return to the heart. The main reason, as you suggest, is that the BP drops. The body compensates by (among other things, such as constricting the blood vessels) increasing the heart rate.

The BP drops because with sitting up, gravity now pulls blood out of the chest, decreasing its return to the heart.

]]> Autor: monkey77 http://www.zastawka.pl/why-does-heart-rate-increase-immediately-after-sitting-up-from-the-supine-position/comment-page-1/#comment-578 monkey77 Thu, 01 Jan 1970 07:11:02 +0000 http://www.zastawka.pl/why-does-heart-rate-increase-immediately-after-sitting-up-from-the-supine-position/#comment-578 (Guessing) Maybe partially because the heart needs to increase the blood flow to the brain to compensate for it being raised. Another answer would be... Because adrenalin is released when a person thinks about sitting up. The blood pressure question is a little past me, but you could google postural hypotension. Heres from medterms.com: Postural hypotension: A drop in blood pressure (hypotension) due to a change in body position (posture) when a person moves to a more vertical position: from sitting to standing or from lying down to sitting or standing. The change in position causes a temporary reduction in blood flow and therefore a shortage of oxygen to the brain. This leads to lightheadedness and, sometimes, a "black out" episode, a loss of consciousness. (Guessing) Maybe partially because the heart needs to increase the blood flow to the brain to compensate for it being raised.

Another answer would be… Because adrenalin is released when a person thinks about sitting up.

The blood pressure question is a little past me, but you could google postural hypotension.

Heres from medterms.com:

Postural hypotension: A drop in blood pressure (hypotension) due to a change in body position (posture) when a person moves to a more vertical position: from sitting to standing or from lying down to sitting or standing.

The change in position causes a temporary reduction in blood flow and therefore a shortage of oxygen to the brain. This leads to lightheadedness and, sometimes, a "black out" episode, a loss of consciousness.

]]> Autor: chandrasekharam b http://www.zastawka.pl/why-does-heart-rate-increase-immediately-after-sitting-up-from-the-supine-position/comment-page-1/#comment-577 chandrasekharam b Thu, 01 Jan 1970 05:17:22 +0000 http://www.zastawka.pl/why-does-heart-rate-increase-immediately-after-sitting-up-from-the-supine-position/#comment-577 Generally in younger and healthy persons there will be no much difference in the BP in the prone or supine positions due the balanced autonomic system maintained in health. However, in old age, cardiovascular diseases, anaemias etc., this gets affected / disturbed causing variations in the blood pressure (BP) even for slightest disturbance in the posture, exercise, diet, stress and strain, psychological thoughts, anxiety states etc; hence the postural variations in the blood pressure. And naturally as a compensatory reactive mechanism, when ever the BP falls the pulse rate should immediately go up naturally to maintain normal blood supply to the vital organs especially the brain for normal function. Generally in younger and healthy persons there will be no much difference in the BP in the prone or supine positions due the balanced autonomic system maintained in health.

However, in old age, cardiovascular diseases, anaemias etc., this gets affected / disturbed causing variations in the blood pressure (BP) even for slightest disturbance in the posture, exercise, diet, stress and strain, psychological thoughts, anxiety states etc; hence the postural variations in the blood pressure.

And naturally as a compensatory reactive mechanism, when ever the BP falls the pulse rate should immediately go up naturally to maintain normal blood supply to the vital organs especially the brain for normal function.

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