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# Overtraining: How to Diagnose & Prevent It
- URL: https://www.alphabetguides.com/overtraining-how-to-diagnose-prevent-it/
- Published: 2026-09-08T08:00:41.000Z
- Updated: 2026-09-08T08:00:40.000Z
- Description: Monitoring and early diagnosis can prevent overtraining syndrome, as can planned training, rest, recovery, nutrition and lifestyle choices.
- Author: Dr. Robert Davies
- Tags: Exercise, #pin, #link, Health, #cite

summary 

- Dips in performance exist on a spectrum ranging from temporary "overreaching" to full, stubborn "overtraining syndrome".
- Early diagnosis can prevent it. So track performance markers like your sleep, mood, heart rate, and health status to avoid it.
- Overtraining can be prevented by properly planned training, rest, recovery, good nutrition and other lifestyle choices.

In Victorian England, prisoners were forced to [exercise](https://www.alphabetguides.com/tag/exercise/) for 6–8 hours a day by treading on wide wooden boards, which spun a wheel. The wheels were (sometimes!) connected to mills that ground grain or pumped water. This is where the word “treadmill” comes from. 

The purpose of this task was punishment. The goal was to break prisoners' spirits, exhaust them physically, and destroy them mentally. They overtrained them on purpose. 

## Defining Overtraining

The formal term for overtraining is technically “overtraining syndrome”. It is characterised by a clear and consistent change in the way your body works in response to exercise. Overtraining syndrome *cannot* be attributed to injury or other external factors (other than [exercise](https://www.alphabetguides.com/tag/exercise/)). It’s not easy to diagnose.

Therefore, it is critical to be able to distinguish between the normal fatigue that you experience after you exercise (technically referred to as “overreaching”) and overtraining syndrome. 

The time duration that the fatigue lasts for, the change in your performance, the severity of the other symptoms, the effect that rest has on it, and the presence of other side effects are distinguishing features of overtraining syndrome. It is categorised into three distinct types:

#### 1\. Functional Overreaching

This is a short-term increase in the amount of exercise you are doing, followed by a ****short** dip in performance. This is then followed by improvements in performance (or strength) and improvement with rest. Functional overreaching is typically expected, normal, and only occurs over a few days. ****This is not overtraining**. 

#### Non-Functional Overreaching

Similar to functional overreaching, but performance only returns to baseline without any further improvement in performance after rest. In other words, training is no longer working as intended or as it should be. It can be accompanied by other symptoms, but it is generally cured within a week or two. ****This is not overtraining**.

#### Overtraining Syndrome

Overtraining syndrome is different from non-functional overreaching, as there is a ****persistent** performance decline which lasts months. Performance ****doesn’t** return to baseline levels with [rest and recovery](https://www.alphabetguides.com/sleep-for-muscle/). Other physical and mental health issues are usually present alongside the performance decrements. 

---

## Physiology of Overtraining: What to Look For

Recognising these signs, symptoms, and risk factors early on allows for timely intervention before full-blown overtraining syndrome develops. You are probably looking for at least a handful of these. 

1. **"Neurological Dysfunction":**  
  1. Weakness and loss of strength or [endurance](https://www.alphabetguides.com/improve-your-vo2max/).
  2. Persistent feelings of fatigue, slow reaction times, and changes in normal movement patterns.
  3. Reduced focus and intensity during training.
2. **"Endocrine Disruption":**  
  1. Decreased [testosterone](https://www.alphabetguides.com/testosterone-blueprint/)
  2. Increased [cortisol](https://www.alphabetguides.com/what-is-cortisol/), amenorrhoea
  3. Impaired fight-or-flight response.
3. **"Immune Suppression":**  
  1. More frequent illnesses (particularly upper respiratory tract infections like colds, coughs, flus).
  2. Longer recovery from injury
  3. Elevated [inflammatory markers](https://www.alphabetguides.com/anti-inflammatory-diet/)
  4. Persistent pain, stiffness, or soreness in muscles or joints.
4. **"Autonomic Nervous System Imbalance":**  
  1. Poor [sleep](https://www.alphabetguides.com/tag/sleep/).
  2. Change in resting heart rate (higher or lower than normal).
  3. Inability to increase heart rate during physical activity
  4. High blood pressure
  5. Headaches, stomach aches, stomach problems, and tiredness.
  6. Loss of appetite or unintended weight loss or weight gain.
5. **Psychological Disturbance:**  
  1. Irritability and mood swings.
  2. Low motivation or enjoyment for training
  3. Increased anxiety and/or depression
  4. Poor concentration and [brain fog](https://www.alphabetguides.com/tag/brain-health/).
6. **Performance Markers:**  
  1. Inconsistent performance, performance plateauing or getting worse despite training.
  2. Inability to give full effort to training or to complete the expected workout targets.
  3. Longer (than usual) recovery times.
  4. Poor response to stimulants like caffeine.
7. **Risk Factors:**  
  1. Excessive training volume or intensity without adequate rest and recovery.
  2. Monotonous programming, poor nutrition, poor sleep.
  3. Outside stress from work, school or personal life.
  4. Previous illness, exposure to environmental extremes (e.g., heat or altitude) or increased travel demands.

![](https://storage.ghost.io/c/69/dc/69dcec6d-c40d-40e8-823a-e4ec7bb45b10/content/images/2026/08/overtraining.jpg)

---

## Preventing Overtraining: Programming and Lifestyle Solutions

The only nonmedical, widely recommended treatment for overtraining syndrome is **rest**. 

It's debatable whether this means complete rest (i.e., no exercise at all) or relative rest (i.e., more rest than normal). But more rest is the prescription. However, preventing overtraining is much, much better (and easier) than trying to cure it. Here are some tips:

1. **Variation and Periodisation:**  
  1. Avoid monotony, vary the type of exercise, intensity, amount or length of rest.
  2. “[Deload](https://www.alphabetguides.com/deload/)” every month or two by significantly reducing, not stopping, exercise.
  3. “Taper” training by reducing the amount of exercise leading up to competition or other stressful events.
2. [**Nutrition**](https://www.alphabetguides.com/tag/nutrition/) **and Hydration:** Consume enough calories, macronutrients, vitamins, minerals, and fluids throughout the day.
3. **Sleep and Stress Management:** Aim for around 8 hours a night (at least 6). Daily routines, mindfulness, reducing life stressors and resilience training are shown to [improve sleep](https://www.alphabetguides.com/how-to-sleep-better/).
4. **Monitoring and “Auto-regulation”:** If you're concerned about overtraining, you can track your sleep, heart rate, blood pressure, performance and psychological state over time to establish your normal habits.

## The Art of Pushing Without Breaking

You **can** exercise too much! Even the most well-intentioned routine can be counterproductive when pushed beyond your body’s capabilities. 

“Overtraining” is real and defined as the tipping point where the stress of exercise exceeds the body’s ability to repair, recover and adapt from it. Just like those Victorian prisoners, you may still be moving, sweating and straining during exercise — but physiologically and psychologically you’re deteriorating rather than improving. Or worse, you’re getting injured and going backwards. 

Understanding the distinction between traininghard and trainingexcessivelyis essential for maximising [adaptations](https://www.alphabetguides.com/tag/muscle/) to exercise and performance gains whilst avoiding the costly consequences of chronic fatigue and underperformance.

---

#### Sources

1. Budgett R. Fatigue and underperformance in athletes: the overtraining syndrome. Br J Sports Med. 1998 Jun;32(2):107-10\. PMID: [9631215](https://pubmed.ncbi.nlm.nih.gov/9631215/?ref=alphabetguides.com)
2. Halson SL, Jeukendrup AE. Does overtraining exist? An analysis of overreaching and overtraining research. Sports Med. 2004;34(14):967-81\. PMID: [15571428](https://pubmed.ncbi.nlm.nih.gov/15571428/?ref=alphabetguides.com)
3. Kellmann M et al. Recovery and Performance in Sport: Consensus Statement. Int J Sports Physiol Perform. 2018 Feb 1;13(2):240-245\. PMID: [29345524](https://pubmed.ncbi.nlm.nih.gov/29345524/?ref=alphabetguides.com)
4. Kreher JB, Schwartz JB. Overtraining syndrome: a practical guide. Sports Health. 2012 Mar;4(2):128-38\. PMID: [23016079](https://pubmed.ncbi.nlm.nih.gov/23016079/?ref=alphabetguides.com)
5. Meeusen R et al. European College of Sport Science; American College of Sports Medicine. Prevention, diagnosis, and treatment of the overtraining syndrome: joint consensus statement of the European College of Sport Science and the American College of Sports Medicine. Med Sci Sports Exerc. 2013 Jan;45(1):186-205\. PMID: [23247672](https://pubmed.ncbi.nlm.nih.gov/23247672/?ref=alphabetguides.com)