Heart rate is affected by several numbers of factors which includes exercise. In men, the normal range of the heart is within 50 to 100 beats per minute but can go as low as 30 and high as 110 as in the case of 1,000 healthy young aviators. For women, their rate tends to be higher from men’s normal at least 7 beats per minute. With this, however, it cannot be presumed that physical fitness could be related to slower heart rate as experiments revealed. Walking exercise, unlike walking, elevated heart rate and invariably increases it. A man lifting at least 200 kilograms steadily remained at stable heart beat. For a given work load, healthy-trained individual benefits less heart strain because of having greater stroke volume as increase in heart rate deprives the heart from resting. The fit individual had already achieved the desired cardiac output with smaller increase in heart rate. After exercise, the heart rate recovery of a healthy-trained individual is faster, however, the required oxygen of such event falls faster that heart rate. Unlike the untrained, healthy individuals under light exercise does not attribute most of the increase in cardiac output to heart beat as stroke volume decreases in the process. As a result, venous return is held constant curbing the direction of cardiac output opposite to increasing heart beat. Healthy individuals utilize both the increase of heart beat and stroke volume to increase cardiac output. Aside from this, diminishing heart rate participation to increase cardiac output is also observed when a person has contractile power enabling the fair venous return to still achieve increased cardiac output at low levels of heart rate. Stroke volume of the trained individuals is grater than the untrained because of the completed systolic emptying resulting to greater amount of blood ejection which paves the way for optimal diastolic volume. Excessive enlargement of the heart due to additional blood infused is prevented due to relatively thick ventricles thereby does not require increase in heart rate to achieve increase in cardiac performance. With this scenario, fatigue cannot easily interfere in a certain activity because the recovery period of the heart is attained under low heart rate and longer periods of paused heart beat preventing the withdrawal from such activity which is the common case. The increase in arterial blood pressure in exercise increases both the heart beat and stroke volume that results in lesser diastole and greater systole respectively. In slow walking, the second premise may not hold even diverting it to the opposite direction. However, as the intensity of the activity increases, pumping activities rises invariably. Lastly, the response of the blood pressure under different activities relies in several factors beyond intensity, rate or period dedicated to them as the condition of the subject is also a significant contributor. These factors are needed to be able to accomplish high cardiac output requirement.