Trial 1:/ Device Trial 2: Heart Rate: Radial Carotid nd count (*6): nd count (*4

Question

Trial 1:/ Device Trial 2: Heart Rate: Radial Carotid nd count (*6): nd count (*4): count: Heart rate monitor Lab Report (Question Style) Explain why HR and SBP rise with exercise intensity (30 pts.) Identify factors that can affect HR measurement acutely (number them). For each factor, explai it's effect. (30 pts.) Explain why endurance athletes would have a lower resting HR than sedentary individuals. (20 p If you are in a situation where you need to take HR via palpation, explain why you would not war beats for an entire minute during exercise (particularly if you or the subject need to stop exercisin beats). (20 pts.)

Explanation / Answer

1). During exercise, the oxygen consumption by the muscles increase, so the carbon dioxide production also increase, the baroreceptors sense the change in blood oxygen and carbon dioxide levels and stimulate the respiratory center, so the rate of respiration increases. Simultaneously, the sympathetic stimulation occurs to meet the increased oxygen demand of the muscles. This results in increased heart rate (HR) (number of beats per minute), and increased cardiac output (in terms of increased systolic blood pressure (SBP) or force of contraction of the heart). This increases the cardiac output and thus helps to meet the increased oxygen demand.

The Frank-Starling’s law of heart explains the force-length relationship of muscle fibers. The more the muscle fibers are stretched, the greater will be the contraction.

For example, during exercise, the venous return is higher because the cardiac output increase. The increased venous return causes more stretching of the ventricles, which triggers more forceful contraction of the ventricles (increased SBP) and thus, the greater stroke volume. The increased stroke volume increases the cardiac output.

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