The Study
Oxidative stress biomarkers responses to physical overtraining: implications for diagnosis.
This study watches what happens to 12 guys during a tough workout plan. It shows that when they train too much, certain chemicals in their body change and go along with worse performance, but it can't prove that one caused the other.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
When strong guys lift too much weight for too long, their bodies show signs of stress and weakened defenses. Scientists checked their blood and pee to see how bad it got.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 525 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes, this matters — it shows that pushing too hard in the gym can harm your body and hurt performance.
- 2After too much training: pee chemicals went up 7 times, body stress went up 56–73%, good body protectors dropped 31–56%, and bad ones rose 25%.
- 3The more they trained, the worse these numbers got.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Free radical biology & medicine
Year
2007
Authors
Konstantinos Margonis, I. Fatouros, A. Jamurtas, M. Nikolaidis, Ioannis I. Douroudos, A. Chatzinikolaou, A. Mitrakou, G. Mastorakos, I. Papassotiriou, K. Taxildaris, D. Kouretas
Related Content
Claims (3)
When guys who lift weights train too much, their body's natural antioxidants take a hit — they lose a lot of the good kind and build up more of the used-up kind, which might be why they start performing worse.
If guys who lift weights train too much — like a whole lot in a week — their bodies might get stressed in a way that could hurt their performance, and scientists can see this stress through certain markers in their body.
In guys who lift weights a lot, certain chemicals in their urine that show stress on the body are closely linked to both worse performance and more training — meaning they might help tell when someone’s overdoing it.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.