Skeletal muscle adaptation to home-based exercise in chronic kidney disease.
Sarah E Brashear, Anas Mohamed Sulthan, Denise Chan et al.
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In 30 seconds
This randomized controlled trial examined skeletal muscle responses to a 12-week, personalized home-based exercise program in 25 people with stage 3–5 chronic kidney disease (19 assigned to exercise and 6 to usual care). The program combined high-intensity interval training, power walking, and strength training; muscle biopsies were assessed before and after intervention. Exercise was associated with increased muscle capillarization and fewer fibroadipogenic progenitors, alongside increased in vivo muscle oxidative capacity. Fiber size, fiber type, satellite-cell number, and measured fibrosis did not change significantly.
Key findings
- After exercise, muscle capillarization increased and fibroadipogenic progenitors decreased.
- In vivo muscle oxidative capacity increased in the exercise cohort.
- Fiber size, fiber type, satellite-cell number, collagen content, and extracellular-matrix area showed no significant changes.
- Walking distance showed a trend toward increase.
Why it matters
The findings suggest that skeletal muscle in people with stage 3–5 CKD can respond to a home-based exercise program, including changes in vascularization and oxidative capacity. The reduction in fibroadipogenic progenitors may be relevant to future fibrosis, but measured fibrosis itself did not change during the study.
What to keep in mind
The trial was small, with 25 participants and an unequal allocation between exercise and usual care. The intervention lasted 12 weeks, and measured fibrosis did not change.