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Every Cell in Your Body Has a Clock

October 29, 2026 · 30 min

Show notes

Circadian rhythm isn’t just controlled by your brain. Every cell in your body runs on a 24-hour cycle, including your muscle cells. 

Karyn Esser is the chair of the department of physiology and aging at the University of Florida, and she’s a leading expert on circadian rhythm in muscle cells. Karyn's problem is this: How does the circadian rhythm in muscle cells change as we age, and how does exercise help keep our system in sync?

In this episode, Karyn explains: 

  • How every cell in your body has a clock in it
  • How muscle clocks prepare cells for work and schedule recovery during rest
  • How age affects these clocks’ ability to regulate effectively 
  • Why exercise can improve clock function 
  • Why jet lag and late-night eating can put your body clocks out of sync 

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