Which macronutrient provides most of the energy required for moderate- and high-intensity activities?

Question

BlackTom AI · Accepted Answer

To tackle this question, I’ll evaluate what each macronutrient contributes to energy production during moderate- and high-intensity activity.
Option a: Minerals. Minerals are essential for many body functions and can modulate metabolism, but they do not provide a direct, primary energy source like the macronutrients do; they mainly act as cofactors and regulators rather than energy suppliers.
Option b: Protein. Proteins can be used for energy, but only after amino acids are deaminated, and they are not the body's preferred fuel during most exercise bouts. Protein's primary roles are tissue repair and enzyme function, not rapid energy provision in the common exercise window.
Option c: Vitamins. Vitamins are vital for metabolism and energy production pathways, yet they do not supply substantial calories themselves. They function as coenzymes and enable energy-releasing reactions, not as the main energy substrate.
Option d: Fat. Fats are a major energy source, especially at rest or during longer, lower-intensity efforts and during prolonged activities. However, during moderate- to high-intensity activities, the rate of energy production from fat is slower compared to carbohydrates, making fats less efficient for providing most of the energy in these conditions.
Option e: Carbohydrates. Carbohydrates are stored as glycogen in muscles and liver and can be rapidly mobilized to glucose, fueling high-rate energy production required in moderate- to high-intensity activity. They provide more ATP per unit time than fat under these conditions, which is why they are considered the primary energy source for such exercise intensity.
Option f: Water. Water is essential for hydration and physiological processes but does not supply calories or energy to power muscular work.
In the context of moderate- to high-intensity activity, the body relies most heavily on readily available carbohydrate energy, since the speed of ATP generation is higher from carbohydrate metabolism (glycolysis and associated pathways) than from fat oxidation. Thus, carbohydrates are the dominant energy source during these intensities, while fats contribute more at lower intensities or during prolonged efforts when fat oxidation ramps up.

HESM 286 (001) FALL 2025 Cumulative Final Exam

Which macronutrient provides most of the energy required for moderate- and high-intensity activities?

查看解析

登录即可查看完整答案

类似问题

What type of nutrient is starch?

Which of the following would be classified as a simple carbohydrate?

Some individuals are lactose intolerant and cannot digest lactose properly. Which of the following biomolecule types are these individuals having trouble breaking down?

Which statement about carbohydrates is correct?

Sucrose is

Which class of biomolecules can play a structural role or serve as an immediate source of energy in a cell?

This question has been regraded. Select all that apply Hydrocarbons can be found as the basis of which molecules:

Starches and sugars both belong to the group of compounds called carbohydrates.

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单