It is heartbeat, which happens when bloods are flown into the heart from the main artery. ① Finding a disease ② A standard to grasp the appropriate extent of one’s exercise. Age 2 3 4~8 8~15 Adults The aged Pulse rate per minute 100~115 90~100 86~90 80~86 60~80 60~70 The pulse rate above is the measurement when people take a rest. Purpose of exercise Appropriate heart rate (% against maximum heart rate) Strength of exercise Application Beginners of exercise 50 ~ 60 % Low Light walking, Stretching, Patients having heart diseases Losing weight 60 ~ 70 % Low, Medium Jogging Improvement in the endurance of the heart and the lung 70 ~ 85 % Medium, Strong Fast running Professional training 85 ~ 100 % High Soccer, Basketball Normal pulse rate = (Maximum heart rate - One’s age) * within 0.75 Target pulse rate = (220-age) * Strength of exercise (%) = [(Max. heart rate - Normal heart rate) * Strength of exercise (%)] + Normal heart rate Max. heart rate = 220 - Age (male) = 200 - Age (female) When the heart repeats to contract and relax, the quantity of bloodstream in the peripheral blood vessels gets changed and the volume of the blood vessels is changed too. At this time, the quantity of transmitted light is measured by use of an optical sensor and then, the heart rate is indicated in waves. - Measurement of heart rate - Setting the section for heart rate training - Indication of consumed calories - Average heart rate/Maximum heart rate - D-day function - Digital clock - 1,000ion/cc anion effect - Over 92% far infrared rays - Waterproof - Those who enjoy marathon, exercise at fitness club, mountain-climbing, in-line skating, cycling, and golf - Those who want to take care of their health through continuous heart rate check - Those who want to improve their sports records - Those who prepare to lose weight based on objective data - Those who want to prevent unexpected accidents which can be caused by excessive exercise    (Myocardial infarction, Angina pectoris, Hypertension, Cerebral apoplexy)