A new study reveals trained runners' muscles extract more oxygen from blood, reducing heart workload. Researchers compared 44 trained runners with 41 untrained men during cycling. Runners reached higher VO2 peak but lower cardiac output. Their oxygen extraction was 30% higher, indicating greater efficiency. This suggests trained hearts may not need to work as hard.
The study highlights the importance of peripheral oxygen extraction in endurance training. Trained runners achieved higher whole-body oxygen consumption with less cardiac output. This efficiency may protect the heart. Fitness involves more than just pumping blood; muscle and capillary function also matter. This study emphasizes the role of consistent aerobic training. Read more culture coverage.
Endurance training improves muscle oxygen extraction, reducing heart workload. The study found trained runners had a higher arterial–venous oxygen difference. This means their muscles used oxygen more effectively. The findings suggest that trained hearts may not need to work as hard to deliver oxygen. This could have cardioprotective benefits. Related: Alberta runner's trail club thrives after 10 years.
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