Fuel Use During Physical Activity Determine which macronutrient is the most impo

Question

Fuel Use During Physical Activity Determine which macronutrient is the most important for the scenario listed below This macronutrient may contribute up to 15% of energy needs for fueling most important is shouesmoderate aerobic This is an important energy source for low or moderate aerobic exercise This is the important This should constitute thee greatest percentage of calories for all macronutrients for during exercise when exercise duration surpasses one hour endurance athletes In trainingthat lasts more than 20muscles during endurance minutes activities. Protein Fat Carbohydrate

Explanation / Answer

Which is the most important macronutrient to consume during exercise when exercise duration surpasses one hour

This should constitute the the greatest percentage of calories for all macronutrients for endurance athletes in training.

Carbohydrates are the main source of fuel for athletes, especially those participating in endurance sports. Carbohydrates, such as sugar and starch, for example, are readily broken down into glucose, the body’s principal energy source. Glucose can be used immediately as fuel, or can be sent to the liver and muscles and stored as glycogen. During exercise, muscle glycogen is converted back into glucose, which only the muscle fibers can use as fuel.

This is an important energy source for low or moderate aerobic exercise thatlasts more than 20minutes.

Fat is the major fuel for light-intensity to moderate-intensity exercise, such as jogging, hiking, dance, cycling, and recreational swimming. Half of the energy for these activities comes from the aerobic (using oxygen) breakdown of muscle sugar stores (glycogen) and the other half comes from circulating blood sugar and fatty acids. It is recommended that athletes consume 20–30% of calories as fat.

This macronutrient may contribute upto 15% of energy needs for fueling muscles during endurance activities.

Proteins provide the minor fuel source. The energy contribution during small exercise is 5% total and contribution varies according to type of exercise, during endurance exercise, may contribute 3-15% total energy needs. Energy is provided via metabolism of branched-chain amino acids.

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