# What is an external energy cycle?

## What is an external energy cycle?

• External energy cycle: Plants transform radiation from the sun into stored. chemical energy (carbohydrates, proteins, and fats) • Internal energy cycle: Animals, including human beings, use the stored chemical. energy for body needs.

## What is REE and BMR?

Basal metabolic rate (BMR) is often used interchangeably with resting metabolic rate (RMR). While BMR is a minimum number of calories required for basic functions at rest, RMR — also called resting energy expenditure (REE) — is the number of calories that your body burns while it’s at rest.

## During which life stage are energy needs per unit of body weight the highest?

The highest rates of energy expenditure per unit of body weight occur during infancy and decline through childhood. In adult life, the decline continues at approximately 2% per decade because of a decline in lean body mass.

## What does REE measure?

RESTING METABOLIC RATE (RMR)/ RESTING ENERGY EXPENDITURE (REE) • Using indirect calorimetry, the amount of oxygen consumed is measured. ( in direct calorimetry, the amount of. heat produced is measured) • Every calorie consumed requires a fixed amount of oxygen to be converted to energy.

## Which organ requires the most energy while a person is resting?

May is the Month of the Brain, our most energy-consuming organs. Representing only 2% of the weight of an adult, the brain consumes 20% of the energy produced by the body.

## Which body tissue is the least metabolically active?

Organ-tissue level modeling Four metabolically active organs, brain, liver, kidneys and heart, have high specific resting metabolic rates when com- pared with the remaining less-active tissues, such as skeletal muscle, adipose tissue, bone and skin (13).

## What is normal REE?

Resting energy expenditure (REE). Normally, REE accounts for more than 60% of the total energy expenditure and is related most directly to the amount of fat-free (lean) mass, which is more metabolically active than fat mass.

## How do I calculate my REE?

The equation for males is:

1. 66 + (13.7 x weight) + (5 x height) – (6.8 x age) And for females it is:
2. 655 + (9.6 x weight) + (1.85 x height) – (4.7 x age) The formulas are from Katch, McArdle & Katch (2011).