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  "path": "/news/2026-03-high-intensity-interval-boosts-muscle.html",
  "publishedAt": "2026-03-09T16:30:04.000Z",
  "site": "https://medicalxpress.com",
  "textContent": "Researchers from the University of Southern Denmark investigated how eight weeks of high-intensity interval training affect the structure of mitochondria—the parts of muscle cells that produce energy. The study shows that training not only increases the number of mitochondria but also expands the active membrane—the cristae—inside them.",
  "title": "High-intensity interval training boosts muscle mitochondria, study shows"
}