Which tissue is most important for nonshivering thermogenesis in a neonate?
Any increase over basal metabolic activity in metabolic heat production that is not a result of increased muscular activity is defined as nonshivering thermogenesis. Brown fat is the primary source of nonshivering thermogenesis in a neonate and makes up about 6 percent of the body weight of a term infant (Figure 1).
Tissues that contribute to nonshivering thermogenesis in a neonate include:
Skeletal muscle is a minor contributor to nonshivering thermogenesis in a neonate. The heart, kidneys and pancreas do not contribute to nonshivering thermogenesis.
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