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The so-called 'fight or flight' hormone secreted by the inner part of the adrenal gland. It prepares the body for action by its stimulatory effects on muscles, circulation, and carbohydrate and fat metabolism. Adrenaline increases heart rate, the depth and rate of breathing, and metabolic rate. It also improves the force of muscular contractions and delays the onset of fatigue. Its actions oppose those of insulin. Adrenaline accelerates fat mobilization and encourages the conversion of glycogen to glucose.

Adrenaline and adrenaline-related drugs are sometimes used in sport as stimulants. Although these drugs can improve performance, they may produce harmful side-effects such as heart beat irregularities. Consequently, they are on the International Olympic Committee's list of banned substances.

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16y ago

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