Metabolic rates are expressed as energy consumed (Calories) per unit time. Metab
ID: 3518300 • Letter: M
Question
Metabolic rates are expressed as energy consumed (Calories) per unit time. Metabolic rates vary widely and depend on multiple factors. In this lab, you will calculate your metabolic rate under different conditions.
The only equipment you have (and need) to calculate your metabolic rate is a spirometer and an oxygen sensor.
What formula can use to calculate metabolic rate with a spirometer and an oxygen sensor?
Resting:
Exhale: 11.5% O2
Volume out: 2L
2*.115=.23 LO2
Room O2: 13.7%
Volume in: .82 L
.82*.137=.112 LO2
Total Oxygen use: .118 L O2 *3breath cycles / 20sec = .0177 L O2/sec
Exercise:
Exhale: 11.0%
Volume Out: 1.40
1.4*.11=.154
Room O2: 13.7%
Volume in: .74
.74*.137=.101
Total Oxygen use: .053*5 breaths/20sec= .013 L O2/sec
How much did the metabolic rate change with exercise?
Explanation / Answer
metabolic rate is the expenditure of energy at rest to maintain Vital functions such as respiration, temperature regulation etc.
Formula to calculate metabolic rate:-
Metabolic rate = O2 consumed L/h × 4.862 calories
Metabolic rate at resting:-
Total oxygen use=0.0117 L/sec
Calculation of O2 consumed per hour
= 3600sec × 0.0117 L
=42.12 L
Metabolic rate = 42.12 L/h × 4.862 calories
=204.79 calories
Metabolic rate at exercise;-
Total oxygen use= 0.013L/s
Calculation of O2 use per hour
=3600sec ×0.013L
=46.8 L/h
Metabolic rate= 46.8 L/h × 4.862 calories
=227.54 calories
Metabolic rate changed with exercise
=Metabolic rate at exercise- metabolic rate at rest
=227.54 calories-204.79 calories
= 22.75 calories