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Untreated Sleep Apnea Speeds Heart Aging and Raises Death Risk (Level A1) — A woman with white hair covering her face

Untreated Sleep Apnea Speeds Heart Aging and Raises Death RiskCEFR A1

14 Dec 2025

LevelA1
A2
B1
B2

Adapted from Rochita Ghosh-U. Missouri, Futurity • CC BY 4.0

Photo by Markus Kammermann, Unsplash

Level A1 – Beginner
2 min
70 words
  • Scientists studied untreated sleep apnea in laboratory animals.
  • The study was done in a laboratory with mice.
  • Oxygen dropped again and again during mouse sleep.
  • Mice exposed to low oxygen died much earlier.
  • Their hearts showed clear signs of early aging.
  • Blood pressure increased and heart work worsened significantly.
  • Blood vessels became less flexible and weaker.
  • Researchers say this problem can shorten life.
  • Early diagnosis and treatment are very important.

Difficult words

  • apnea — a condition with pauses in breathing during sleep
    sleep apnea
  • untreated — not given medical care or treatment
  • oxygen — the gas animals and people need to breathe
  • diagnosis — the process of finding what illness someone has
  • vessel — a tube that carries blood in the body
    Blood vessels
  • flexible — able to bend or change shape easily

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Have you ever had trouble sleeping?
  • Would you see a doctor for sleep problems?

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