IMG_0159 - Therefore at upper levels of exercise we can...

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I I h fod. odr'$mpl o*lan. n*n* Lab 2 Blood Pressure & Effects of,Exercise tslood PresSure ano EXerclSe must go out", or more technically that the heart increases its contractile strength with increasing volume so that the end-diastolic volume of the heart determines SV. End- diastolic volume can be increased by increasing the pressure in the venous system. Venous pressgre is usually relatively low (-5 mmHg), but can increase through several factors, some of which are increased during exercise. Because the heart is only so big, increases .in CO during more demanding levels of exercise are mediated almost exclusively through increases in HR (Figure 4). These increases in HR are caused initially by decreases in parasympathetic stimulation and later by increases in sympathetic stimulation of the SA node of the heart. hoili'cl fterni i, pru/ssda 6mciid Stroke Volume (L/beat) Heart Rate (beatsimin) p"idnur f,rt{rg 10 15 Cardiac Output Figure 2: This figure diagrams how stroke volume and heart change can be expected to change as cardiac output increases.
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Unformatted text preview: Therefore, at upper levels of exercise we can assume that AHR is proportional to ACO. In addition to measuring heart rate we will measwe systolic and diastolic blood pressure while the body is in different positions, directly after exercise and at five two-minute intervals following exercise. Systolic pressure is the pressure generated by the heart during contraction, while diastolic is the residual blood pressure during relaxation. We'll examine how these values, and the difference between them (Pulse Pressure), change during exercise. Mean arterial pressure (MAP) is the average pressure in the cardiovascular system. We will calculate mean arterial pressure in this lab by calculating a weighted average using the following formula: MAP = ro*!r, 3 Where Po is the diastolic pressure and Pp is the pulse pressure (systolice pressure -diastolic pressure). The pressure driving blood through capillaries acts like any fluid Page 4 20...
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