learning module 3: measuring metabolic rate
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Learning Module 3: Measuring Metabolic Rate. Clark J Cotton. Measuring Metabolic Rate. Metabolic Rate : the sum of all energetic processes occuring in the body. Measuring Metabolic Rate. Metabolic Rate : the sum of all energetic processes occuring in the body. - PowerPoint PPT PresentationTRANSCRIPT
Learning Module 3:Measuring Metabolic Rate
Clark J Cotton
Measuring Metabolic Rate
Metabolic Rate: the sum of all energetic processes occuring in the body.
Measuring Metabolic Rate
Metabolic Rate: the sum of all energetic processes occuring in the body.
How do you measure metabolic rate?
Measuring Metabolic Rate
Metabolic Rate: the sum of all energetic processes occuring in the body.
How do you measure metabolic rate?– Direct Calorimetry
Measuring Metabolic Rate
Metabolic Rate: the sum of all energetic processes occuring in the body.
How do you measure metabolic rate?– Direct Calorimetry– Mass Balance
Measuring Metabolic Rate
Metabolic Rate: the sum of all energetic processes occuring in the body.
How do you measure metabolic rate?– Direct Calorimetry– Mass Balance– Oxygen Consumption
What’s Oxygen Got to do with It?
• Oxygen is the basic reducing compound used to convert sugar to carbon dioxide, releasing energy for our bodies and producing carbon dioxide.
• Depending on level of activity, almost all of our metabolism is dependent on oxygen.
6 O2 + C6H12O6 6 CO2 + 6 H2O
Measuring Metabolic Rate
• Materials: 1 empty milk jug, plastic tubing, 500ml beaker, permanent markers.
• Gradually fill up milk jug in 500ml increments, mark each addition.
• Flip jug upside down in tub of water and insert plastic tube.
• If you breath in through your nose, and out through your mouth you can calculate the amount of air you breath.
Tidal Volumes
• Tidal volume is the volume of air you inhale and then exhale with each breath.
Vital Capacity
• Vital Capacity is the maximum amount of air that you can inhale and exhale.
Dead Space
• Dead space volume is the volume of air that does not participate in gas exchange because of airway volume. Dead space volume (ml) = body weight (kg) * 2.2
Total Lung Capacity
• Total lung capacity is equal to the vital capacity + the dead space.
Measuring Metabolic Rate
• If you know the number of breaths you take per minute, and the average volume of air per breath, you can calculate the total volume of air you’re breathing per hour.
• Assuming that the air you breath contains 21% oxygen, and the air you exhale contains 17% oxygen, you can calculate your total oxygen consumption per hour.
Example:15 breaths / minute500ml air / breath
450 L air / hour
(.21*450) – (.17*450) = 18 L O2 per hour
Possibilities with Metabolic Rate Measurements
Effects of:• Age• Exercise• Size• Temperature• Time of Day
Possibilities with Metabolic Rate Measurements
Effects of:• Age• Exercise• Size• Temperature• Time of Day
Possibilities with Metabolic Rate Measurements
Effects of:• Age• Exercise• Size• Temperature• Time of Day
Possibilities with Metabolic Rate Measurements
Effects of:• Age• Exercise• Size• Temperature• Time of Day
Possibilities with Metabolic Rate Measurements
Effects of:• Age• Exercise• Size• Temperature• Time of Day