Energy Expenditure during Rest and Exercise

BMR zMinimum level of energy required to sustain the body’s vital functions in a waking state. zReflected in heat production zDetermined by O 2 consumption

BMR z12 hour fast zno physical activity z30 minute rest/acclimation z10 minute O 2 consumption zenergy baseline for weight control

RMR zResting Metabolic Rate z3 - 4 hours following light meal zactive metabolic processes & regulatory balance at rest zaccounts for 60-75% of TDEE zfeeding 10%, physical activity 15-30%

RMR/BMR zLBM offers good index of BMR zBMR in females 5-10% < males z2-3%  in BMR/decade   body fat

RMR/BMR zHeavy resistance training in y.o.  8%  in BMR zheavy resistance training can offset usual  in BMR that are associated w/ aging z8 week aerobic training  10%  in BMR

Estimated BMR

Estimated MR per Hour z= body surface area (nomogram) * estimated BMR znomogram - stature/height - body mass/weight - surface area

Nomogram

Factors Affecting Energy Expenditure zPhysical Activity zDietary-Induced Thermogenesis - obligatory - digestive process - facultative - sympathetic response zClimate

Classification of Physical Activities zPhysical Activity Ratio (PAR) - light work - 3x resting requirement - heavy work - 6x-8x - maximal work - 9x+

MET zMET - multiple of RMR z1 MET = 3.6 mL / kg-min

MET zMales

MET zFemales

Daily Expenditure zAge zmales kcal zfemales kcal zBody Mass  expenditure esp. w/b activities

Body Mass & Expenditure

HR to Estimate Expenditure zLinear relationship w/in a person zif HR is known then O 2 uptake can be predicted w/ reasonable accuracy zvalidity - specificity??

HR vs. O 2 Uptake Oxygen Uptake (L/min) Heart Rate (beats/min)