Muscles get used to hard workouts

Original Title

Eccentric exercise per se does not affect muscle damage biomarkers: early and late phase adaptations

Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms

Summary

When you first do a new kind of workout, your muscles get sore and hurt — but if you keep doing it once a week, they stop getting damaged, even if the workout is just as hard.

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Surprising Findings

Muscle damage biomarkers (CK, DOMS, ROM loss) disappeared completely after 10 weeks—even though participants were still performing maximal-effort eccentric contractions.

It contradicts the long-held belief that eccentric exercise inherently causes muscle damage. The fact that damage vanished despite identical mechanical load suggests the body adapts at a systemic level, not just locally.

Practical Takeaways

If you're new to eccentric training (e.g., slow lowers in squats or pull-ups), don’t panic if you’re sore after the first session—it’s normal. But after 3–4 sessions, the soreness should fade, and you’ll still be getting stronger.

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