01:119:116 Lecture Notes - Lecture 5: Resting Metabolic Rate, Basal Metabolic Rate, Sodium Bicarbonate
16 Oct 2019
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Implications of EPOC
• Optimal recovery depends upon type of exercise
• Steady rate exercise
• Little to no lactate accumulation
• Use passive recovery- extra activity would only serve to elevate total
metabolism & delay recovery
• Non steady rate exercise
• Blood lactate will accumulate
• Active recovery- will accelerate lactate removal
• Working about 30-45% if cycling recover
• Working about 55-60% if running to recover
• Differences reflect localized muscular effort
RQ and RER/R
• Respiratory Quotient(RQ):
• Tells us what fuel is being used during rest and steady state aerobic exercise
• RQ=CO2 produced/O2 consumed
• RQ for carbohydrate=1.00
• RQ for fat=.696
• RQ for protein=.818
• RQ- assume that oxygen consumption and carbon dioxide
production measured at mouth reflects activity in tissues
• Respiratory Exchange ratio(RER or R)
• Does not indicates fuels used- measured during non steady state
exercise, but still computed like RQ
• Can be >1.0 due to hyperventilation and buffering of lactate w/ sodium
bicarbonate during high intensity exercise
Jan 31st
Chapter 9
Human Energy Expenditure During Rest and Physical Activity
Energy Expenditure At Rest
• Total daily energy expenditure(TDEE):
• Resting metabolic rate (60-75%)
• Thermogenic effect of food consumed( about 10%)
• Energy expended during PA and recovery(15-30%)
• Basal metabolic rate
• Energy to maintain vital functions in wake state
• Measured in fasted state and no exercise
• Resting metabolic rate
• Energy to maintain vital functions plus digestion
• Measure 3-4 hours following a meal, no prior exercise
Metabolism at Rest
• Resting energy metabolism varies in proportion to the body's surface area
• Resting metabolic rate (RMR) as a function of LBM provides best method for accounting
for intergender differences in energy expenditure
• If looking at absolute values, women have 5-10% lower RMR than men
