Metabolic and endocrine response to exercise: Sympathoadrenal integration with skeletal muscle

Derek Ball*

*Corresponding author for this work

Research output: Contribution to journalReview article

14 Citations (Scopus)

Abstract

Skeletal muscle has the capacity to increase energy turnover by w1000 times its resting rate when contracting at the maximum force/power output. Since ATP is not stored in any appreciable quantity, the muscle requires a coordinated metabolic response to maintain an adequate supply of ATP to sustain contractile activity. The integration of intracellular metabolic pathways is dependent upon the cross-bridge cycling rate of myosin and actin, substrate availability and the accumulation of metabolic byproducts, all of which can influence the maintenance of contractile activity or result in the onset of fatigue. In addition, the mobilisation of extracellular substrates is dependent upon the integration of both the autonomic nervous system and endocrine systems to coordinate an increase in both carbohydrate and fat availability. The current review examines the evidence for skeletal muscle to generate power over short and long durations and discusses the metabolic response to sustain these processes. The review also considers the endocrine response from the perspective of the sympathoadrenal system to integrate extracellular substrate availability with the increased energy demands made by contracting skeletal muscle. Finally, the review briefly discusses the evidence that muscle acts in an endocrine manner during exercise and what role this might play in mobilising extracellular substrates to augment the effects of the sympathoadrenal system.

Original languageEnglish
Pages (from-to)R79-R95
Number of pages17
JournalJournal of Endocrinology
Volume224
Issue number2
DOIs
Publication statusPublished - 2015

Keywords

  • Cytokine
  • Endocrine
  • Muscle energetics
  • Sympathoadrenal

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