Measurement of body heat production

Direct calorimetry Indirect calorimetry

Metabolic rate

This depends on: 5

Muscular exertion during or just before measurement

Recent food ingestion

High/low environmental temperature

Height, weight and surface area

Growth

Reproduction

Lactation

Emotional state

Body temperature

Circulating levels of thyroid hormones Circulating catecholamine levels

Closed-circuit spirometry Open-circuit spirometry

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