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When exercising, a number of things might alter heart rate. The oxygen/fuel ratio is as important to your body as it is to your car. Your body uses oxygen and a variety of fuels (carbohydrates, fats, and proteins) to produce muscle energy, much like a car's engine does. Numerous physiological events take place when the body's ratio is out of balance.The tachometer in your body, your heart rate, can be used to measure these occurrences. The true effectiveness of the body's engine, like that of an automobile, depends on a variety of components cooperating well. If there are any symptoms of engine trouble in your body, your heart rate will show it.having diabetes, high cholesterol, or cardiovascular disease. Temperature of the air. Body placement (standing up or lying down, for example) Emotions.to know more about Pulse rate visit https://brainly.com/question/17744527#SPJ9