REF-453 · Hawley, Hargreaves, Joyner, Zierath, 2014 · Cell, Vol. · Paper · PubMed

Integrative biology of exercise

Cell review consolidating molecular, cellular and systemic exercise biology

B+moderate evidenceMeasured on a mixed groupWritten before October 2026, being re-checked

Scope

Exercise is framed as a major challenge to whole-body homeostasis: contracting muscle raises energy and oxygen demand and perturbs numerous cells, tissues and organs, and multiple integrated — often redundant — responses operate to blunt those homeostatic threats.

The review covers what molecular techniques have revealed about the multiplicity and complexity of the cellular networks involved in exercise responses, and how muscle "communicates" with other organs to mediate the benefits of exercise on health and performance. Frequently used as a single authoritative overview of "how exercise works".

Key Findings (themes)

1

Homeostatic challenge and integrated, redundant responses to the energy and oxygen demand of contracting muscle (abstract)

2

Molecular networks of the exercise response — signalling cascades and master regulators of adaptation (specific molecules such as Ca²⁺, ROS, AMP/ATP, PGC-1α, AMPK, mTOR: full text; not checked against the abstract)

3

Muscle-to-organ communication — muscle as a signalling organ mediating systemic effects (abstract)

4

Health and performance — the same mechanisms underlie the benefits of exercise for both (abstract)

Practical Application

Narrative review (Hawley, Hargreaves, Joyner & Zierath 2014): exercise perturbs whole-body homeostasis through the energy and oxygen demand of contracting muscle; multiple integrated and redundant responses blunt that threat, and molecular work shows muscle "communicating" with other organs to mediate the health and performance benefits of exercise. Use it as the anchor citation for the mechanism of adaptation; it carries no protocol-level numbers.
Foundational for understanding "why training works" at the systems level
Less directly actionable than substrate-metabolism papers, but conceptually central

Limitations

High-level narrative review, light on protocol-level prescriptions; no systematic method
Evidence base up to 2014
Mouse models heavily represented in the underlying literature (translational caveat)
How this entry was checked and changed
Why this level

regraded 2026-09-27 from A: authoritative narrative review from a leading group, no systematic method

Content correction 2026-09-27
Level A -> B+ (narrative review; "2000+ citations" is not an evidence grade and was removed).
Scope and Key Themes rewritten to the abstract's framing (homeostatic challenge, integrated redundant responses, muscle–organ communication); the named pathways/regulators are kept only as full-text topics.
Added Tier/Sport lines and an abstract-based Practical Application lead.