NASM Chapter 4 Exercise Metabolism and Bioenergetics

A marathoner just completed a grueling 26.2 mile run. A power lifter, just threw 200 kg’s over his head in a snatch. Both of these athletes are using energy.

How does energy consumption of an endurance exercise and a high intensity exercise differ?

In this chapter we will find out.

But first let’s talk about something called Substrates. Substrates can come from Carbohydrates, Fats, and Proteins

Substrates are broken down food converted into an usable form of energy.

The energy stored in Substrates is then chemically released, into the form of of a high energy compound called Adenosine Triphosphate (ATP)

Adenosine Triphosphate is really powerful. Like whoa. Like explosive. Remember that powerlifter we mentioned earlier? Recall that marathoner? They are both using ATP. But the body produces ATP at different rates, depending on exercise.

Energy Metabolism or Bioenergetics: Is the study of how energy is transformed through various biochemical reactions.

Metabolism. That words gets thrown around a lot. People blame their metabolism for a lot things. But here is what Metabolism really means. Metabolism is all the chemical reactions that occur in the body to maintain itself.

Exercise Metabolism- Is the investigation of Bioenergetics (Energy Metabolism) As it relates to unique physiologic changes (Heart Rate, and Respiratory Rate go up) and demands placed on the body during exercise.

Sources of Energy Metabolism (Bioenergetics)

Remember those substrates coming from Fats, Carbohydrates, and Protein?

Here’s how those get used.

Carbohydrates: When they get digested they turn into something called Glucose. Glucose can either be used or stored in the cells. The storage form of glucose is Glycogen.

Fats: The chemical form/ substrate form of fat is Triglycerides. When calories are consumed but not actively used. they get turned into triglycerides and transported to fat cells where they are stored. One benefit of fat as a fuel source is Inexhaustible supply. Which can be broken down into triglycerides during prolonged physical activity.

Proteins, the last line of energy.

Because of their structure protein molecules are poor chemical energy sources. Usually when protein is utilized as energy, the body is in Starvation. When amino acids are used in energy production that is called gluconeogenis.

So your body needs a constant supply of energy to function and maintain health.

Substrates from Fats, Carbohydrates, and proteins, provide that energy by ATP (Adenosine Triphosphate)

Bioenergetics is the study of energy transformed through various chemical reactions.

Exercise Metabolism is the examination of Bioenergetics (Energy Metabolism) and the body’s energy demands during exercise.

Stay hungry my friends, and Remember

Live Creatively

See things in New Perspectives

Work Passionately

Do things Boldly

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