Table 2

Energy expenditure of systems and organs under various conditions

System/organ

Energy expenditure

per day (kJ/day)a


Total body basal metabolic rate

7,000

Total body metabolic rate with usual activity

10,000

Total body metabolic rate during minor surgery

11,000

Total body metabolic rate with multiple bone fractures

Up to 13,000

Total body metabolic rate with sepsis

15,000

Total body metabolic rate with extensive burns

20,000

Total body daily uptake (absorptive capacity in the gut)

20,000

Immune system metabolic rate under normal conditions

1,600b

Immune system metabolic rate moderately activated

2,100b

Central nervous system metabolic rate

2,000

Muscle metabolic rate at rest

2,500

Muscle metabolic rate activated

2,000 to 10,000 and more

Liverc metabolic rate

1,600

Kidney metabolic rate

600

Gastrointestinal tractc metabolic rate

1,000

Abdominal organ (together)c metabolic rate

3,000 to 3,700

Lungc metabolic rate

400

Heart metabolic rate

1,100 (and more when activated)


Data taken from [2]. a10,000 kJ = 2,388 kcal. bSee derivation of energy need in [2]. cEnergy need is difficult to estimate independent of the immune system in these organs.

Spies et al. Arthritis Research & Therapy 2012 14:216   doi:10.1186/ar3885