The unit used to represent energy expenditure in the reviewed material is:

The unit used to represent energy expenditure in the reviewed material is:

• A. cal/kg/m
• B. kg/m²
• C. cal/kg/hr
• D. m/sec

Answer: (A)

The main idea here is how energy cost is measured relative to movement. When we talk about energy expenditure in movement studies, we often want to know how much energy is used to move a given amount of body mass over a certain distance. That’s why the unit calories per kilogram per meter (cal/kg/m) is used. It expresses the energy required to transport one kilogram of body mass for every meter traveled, which makes comparisons fair across different body sizes and distances. This unit is different from energy-use rate per time, such as calories per kilogram per hour. That metric tells you how much energy the body uses per hour for a given mass, regardless of how far you’ve moved, so it’s more about metabolic rate than movement efficiency per distance. The other options don’t capture energy use tied to distance: kilograms per square meter is a body-size index (like BMI), and meters per second is a measure of speed, not energy expenditure. So cal/kg/m is the appropriate unit because it directly quantifies energy cost of transport: how many calories are needed to move one kilogram of body mass for each meter traveled.

The main idea here is how energy cost is measured relative to movement. When we talk about energy expenditure in movement studies, we often want to know how much energy is used to move a given amount of body mass over a certain distance. That’s why the unit calories per kilogram per meter (cal/kg/m) is used. It expresses the energy required to transport one kilogram of body mass for every meter traveled, which makes comparisons fair across different body sizes and distances.

This unit is different from energy-use rate per time, such as calories per kilogram per hour. That metric tells you how much energy the body uses per hour for a given mass, regardless of how far you’ve moved, so it’s more about metabolic rate than movement efficiency per distance. The other options don’t capture energy use tied to distance: kilograms per square meter is a body-size index (like BMI), and meters per second is a measure of speed, not energy expenditure.

So cal/kg/m is the appropriate unit because it directly quantifies energy cost of transport: how many calories are needed to move one kilogram of body mass for each meter traveled.