The following parameters were measured in a trained athlete and a sedentary univ

Question

The following parameters were measured in a trained athlete and a sedentary university administrator, at rest and during a bout of exercise: A) Fill in the blanks above. B) Give a possible explanation as to why stroke volume in the administrator didn't change in the same way with exercise as it did in the trained athlete. 4. The wall thickness of an essentially spherical left ventricle can be considered constant at 1.5 cm throughout the cardiac cycle. Measured transmural pressures are as follows: 19 mm Hg as the AV valve opens, 24 mm Hg as the AV valve closes, 71 mm Hg as the semilunar valve opens, 80 mm Hg as the semilunar valve closes, and maximally, 99 mm Hg when 80% of the stroke volume has been ejected. Suppose that the ventricular end diastolic volume (EDV) is 362 mls and the cardiac output is 4.9 L/min at a heart rate of 75 bpm. A) The left ventricular stroke volume (SV) = ___ B) The left ventricular preload in mm Hg = ____.

Explanation / Answer

1.

2. Stroke's volume in administrator does not change the same way as in trained athelete because in athlete the blood will return to the back to the heart. Due to the Frank-Starling law of the heart, it caues an increases in blood volume entering the heart, which will result in increased volume of blood ejected. Also, myocardial distension increases which results in an increase in contractility and Aortic and pulmonary pressure.

Cardiac output Heart rate Stroke's volume Trained athelete (rest) 5.0 66 100 Exercise 30 116 220 University resident (Rest) 5 72 60 Exercise 7.2 180 120

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