Lecture 5 Block 2 Flashcards
what are thermal neutral zones
range of ambient temperatures at which there is no change in body temp or metabolic rate
what are the main variables that influence metabolic rate
temperature and body size
what does direct calorimetry measure
total body heat produced
what does indirect calorimetry measure
respiratory gases that are influenced by metabolism
what are some other methods to measure energy expenditure
heart rate measurement and doubly labeled water
what does the heart rate measurement measure
indirect measure of O2 consumption
what does the doubly label water measure
CO2 production
what is the equation for the respiratory quotient
rate of CO2 production/rate of O2 consumption
when is BMR measured
on resting, fasted animals with no thermal stress during their rest phase
what is BMR
minimum cost of living in endotherms
what is SMR
minimum cost of living in ectotherms
when is SMR measured
on resting, fasted animals at a specific temperature
what is the normal TNZ for humans
25-30 degrees celsius
why is it important to measure fasted animals
animals who are fed have lower LCTs than animals that are fasted
