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INTRODUCTIONrnUnder physiological conditions, the sympathetic nervous system (SNS) is involved in the so-called“fight-or-flight”response to acute stress. Upon perceiving threats to internal homeostasis, the SNS acts on multiple molecular and cellular processes throughout the body that ensure a coordinated adaptive response to different stressors. Physical mobility is boosted through an increase in heart and respiratory rates, as well as through energy mobilization from adipose tissue and the liver1–2.