Protein that causes your heart to beat faster is most likely related to an allergic reaction. Proteins are an essential part of every food and beverage that you consume. After you ingest a food, your digestive system breaks down the proteins and absorbs them into the body to build muscles and cells.

The impact of exercise on your heart rate can be a complex concept to understand. Your heart rate will definitely increase as your activity level rises, but there is a healthy range for your heart rate, and anything outside of that may be an indicator of a heart condition.

Your heart rate provides a method to monitor your exercise intensity and ensure you gain the most benefits. Your maximum and target heart rates tend to decrease with age. If you're a healthy 70-year-old man, you should aim to reach at least 75 beats per minute during aerobic exercise.

Exercising with a heart rate sensor allows you to check how much effort you bring based on your heart rate. The higher your heart rate, the harder your lungs work, which is proportionately tied to your calorie expenditure.

Submaximal graded exercise is any physical activity whose intensity increases at regular intervals up to but never exceeding 85 percent of your maximum heart rate, according to the American Council on Exercise.

Brisk walking, like any form of exercise, will cause your heart to beat faster. As a general rule, the faster you move, the more your heart rate will increase. For example, running will typically cause a faster heart rate than walking at a leisurely pace.

A linear relationship exists between exercise intensity and heart rate. As exercise intensity increases, so does the heart rate. So one way to measure the intensity of your workout is to gauge how hard your heart is working.

An adrenaline rush is commonly known as the “fight-or-flight” response, and happens when you feel a sudden threat. The perceived threat can range from a vicious dog barking, job or family stress or someone trying to pick a fight with you.

If your toe goes numb during a run, take a look at your shoes before you jump to any conclusions. Tight shoes and tight lacings can compress your nerves and cause you to lose sensation in your toes, including your big toe.

It sounds counterintuitive, but just because you're working out harder, increasing your heart rate and burning calories doesn't mean you're burning fat. Your body's ideal fat-burning zone is only 60 to 70 percent of your maximum heart rate.

Most people are focused on burning fat with exercise because more than 66 percent of U.S. adults are overweight or obese, according to the American College of Sports Medicine. However, it is important to also maintain the lean muscle tissue you have to function properly as well as burn the most fat.

The pulse is most commonly checked on the wrist or neck, but there are other places on the body where a pulse can be examined. The pulse can be felt anywhere an artery runs close to the surface of the skin. Use two fingers to apply slight pressure to the site and you should be able to feel the pulse.