The Study
From Fatigue to Overtraining: Beyond the Dichotomy of Structure and Function
This study is like a teacher summarizing what scientists think about overtraining. It doesn’t do a new experiment or collect new data — it just explains ideas from other studies. So, it can help us understand the topic, but it can’t prove what causes overtraining.
Analysis score
Maximum 5 for a narrative review.
Where the score came from
When athletes train too much and don’t rest or eat enough, their bodies can’t recover, leading to long-term drops in performance. This is called overtraining. There’s a scale from normal tiredness to serious overtraining, and doctors use a five-part checklist to diagnose it. New tech can test body chemicals to catch early signs.
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 51 / 100
Quality score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes, this matters because catching overtraining early can help athletes recover faster and avoid long breaks from sport.
- 2Overtraining causes performance drops lasting weeks to months.
- 3The 'Olympic Squares' tool checks 5 areas: performance, stress, recovery, food, and mental health.
- 4Metabolomics can measure about 1,000 body chemicals, mostly fats, to spot problems early.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Sports & Exercise Medicine Switzerland
Year
2026
Authors
Carrard
Related Content
Claims (6)
When athletes push too hard, their performance might dip at first — but if it's 'functional' overreaching, they bounce back stronger. If it's 'non-functional,' they stay weak even after resting.
To diagnose overtraining in athletes, doctors need to rule out other health issues like low nutrients, infections, or energy deficiency, because those can cause similar symptoms and often happen at the same time as overtraining.
If athletes push themselves too hard for too long without enough rest, they can develop a serious condition called overtraining syndrome, where their performance gets worse and just won't improve — even after taking time off.
When athletes train too much without enough recovery, their brain and body systems—like brain chemicals, hormone responses, and muscle energy production—can go out of balance, leading to overtraining syndrome.
There's a tool called 'Olympic Squares' that checks athletes in five areas—like how they're performing, how stressed they are, and how well they're eating and recovering—to help figure out if they're overtrained when their performance drops for a long time.
New tech can scan hundreds of chemicals in your body, including fat-based messengers, to create a personal 'metabolic fingerprint' that might catch early warning signs when athletes are pushing themselves too hard.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.