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# The effect of posture on heart

mins 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16.
Group 1 46 48 44 48 54 52 58 56 62 62 64 62 50 46 44 44.
2 66 62 66 62 64 68 72 68 74 72 76 76 70 60 60 58.
3 52 50 48 48 58 60 58 56 68 66 58 54 62 56 52 52.
4 52.
50 48 48 50 46 40 40 48 46 42 40 50 52 50 50.
5 52.
54 54 52 58 58 60 48 66 70 66 60 60 54 48 48.
6 72.
64 72 72 86 78 80 84 94 102 102 104 64 58 58 58.
7 66.
62 68 70 76 74 88 86 70 84 82 86 64 62 68 60.
avg 58.
56 57 57 64 62 65 63 69 71 70 69 60 55 54 53.
.
Lying down Sitting down Standing up Lying down.
G: Interpretation of Results.
From the graph and the results we can see that generally as we move from horizontal to vertical, heart rate increases. We can also see that when going from vertical to horizontal, the heart rate decreases.
.
Between minute 1-4 the subject was lying on a desk. I observed that the heart rate, on average was 57.0 beats per minute. Then between minute 5-8 the subject was sitting on the desk. I observed that the heart rate was on average 65.5 beats per minute. When the person was standing up between minute 9-12 the heart rate was around 69.8 beats per minute. Finally between minute 13-16, the subject was lying horizontal desk again. The average heart rate was 55.5 beats per minute. The results obtained from the experiment were reasonably accurate as, in general the average resting heart rate of an adult is 55 beats per minute and the average heart rate of an adult standing up is 70 beats per minute.
The fact that heart rate changes every time we change posture is due to gravity. When standing vertically it is harder to pump blood back to the heart via the veins, than if you were lying down. The body needs to maintain a constant cardiac output, which is the stoke volume, the volume of blood out each time the heart beats, multiplied by the heart rate, the number of times the heart beats per minute. Which results in the equation:.
Cardiac Output (CO) = Stroke Volume (SV) X Heart Rate (HR).

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