METABOLISM IN TRAINING Flashcards
what do all metabolic processes produce
heat
rate of heat production defines rate of energy metabolism
calorimetry
defines the measure of heat transfer
can be indirect or direct
direct calorimetry
measures heat production
1cal = inc temp of 1g of water by 1degC
1 kcal = inc temp of 1kg of water by 1degC
measure the body’s heat production to calc energy expenditure
CANNOT be used in intense exercise bcs slow results
indirect calorimetry
measures inspired o2 and expired co2
open circuit spirometry: respiration chamber, douglas bags attach to person
- measures breath by breath
closed circuit spirometry: from chamber, breathe into
- limited space
based on measure of o2 utilization
fuel can be determined via co2…carb/fat metabolic processes make co2
L to kcal conversion
1L = 5kcal
metabolic cart
measures volume and concentration of gas in air, breath by breath
values shown as o2 consumed/min and co2 produced/min
VI and VE
VI = vol air inspired
VE vol air expired
FIO2
FEO2
fraction of o2 in inspired air
fraction of o2 in expired air
FICO2
FECO2
fraction of o2 in inspired and expired air
VO2 calc
(VI x FIO2) - (VE X FEO2)
co2 and o2 relationship in air
expired o2 conc is greater than o2 in inspired air
co2 conc is higher in expired than inspired air
difference is how much o2 taken, how much co2 produced
VCO2 calc
(VE X FECO2) - (VI X FICO2)
ATPS
ambient temp and pressure, saturated
environ condiitons air was collected in, for measurements by douglas bag
must be converted to BTPS or STPD
BTPS
body temp and pressure, saturated
gas expands in lungs, for body measures VE and VI
STPD
standard temp and pressure, dry
0degC, 760mmhg, dry
for vo2 and vco2
must convert ATPS to this, which carts to automatically
