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3d ago

Genetic Study Reveals Blood Pressure and Cold Tolerance Adaptations in Jeju's Haenyeo Divers

Research confirms unique genetic traits among Jeju Island natives, suggesting evolutionary adaptations for diving and potential health benefits, including reduced stroke risk and pregnancy protection.

Image
A group of Haenyeo pose for photographers as they perform a demonstration during a media event on November 6, 2015. The term "Haenyeo," or "sea women," refers to women who use free-diving techniques to retrieve shell fish from the sea floor.
Legendary Female Free-Divers Reveal Evolution in Action on South Korean Island

Overview

  • A study published on May 2, 2025, found that Haenyeo divers and other Jeju Island natives possess a blood pressure-lowering gene variant at a significantly higher frequency than mainland Koreans.
  • This genetic adaptation may protect against hypertensive complications during pregnancy, a critical factor for Haenyeo, who historically dove while pregnant.
  • Additional genetic variants linked to cold tolerance and red blood cell function were identified, aiding divers in enduring frigid waters and optimizing oxygen use.
  • The research highlights the importance of lifelong training in enhancing the Haenyeo's dive reflex, with divers exhibiting significantly greater heart rate reduction during simulated dives compared to non-divers.
  • Jeju Island's low stroke mortality rate could be linked to these genetic traits, with researchers exploring broader cardiovascular health applications, including treatments for hypertension and stroke prevention.