Final answer:
Specific conditions must apply when measuring either basal or standard metabolic rate, including the requirement that animals be in a state of rest and fasting.
Step-by-step explanation:
The specific conditions that must apply when either basal or standard metabolic rate is being measured include the requirement that animals must be in a state of rest and fasting. This means that the measurements should be taken when the animal is not actively engaged in any physical activity and has not consumed any food. Additionally, it is important to control for factors such as body temperature and environmental conditions to ensure accurate measurements.
For example, when measuring basal metabolic rate (BMR), which represents the energy expended by an animal at rest, the animal must be in a thermoneutral environment, where the temperature is within its comfort range. This helps prevent any additional energy expenditure due to thermoregulation.
In the case of standard metabolic rate (SMR), which represents the energy expended by an animal at rest but under standardized conditions, it is important to ensure that the animal is in a specific physical and environmental state. This may involve acclimating the animal to the experimental conditions prior to measurements.