What does overtraining mean?
Sport is healthy – this is true for most people and in most phases of life. However, those who train intensively over a longer period without adequate recovery can enter a state known as overtraining or overtraining syndrome. In this condition, the training load chronically exceeds the body's capacity to recover. Instead of an improvement in performance, the result is stagnation or even a marked drop in performance.
Overtraining is not just an issue for professional athletes. Ambitious recreational runners, triathletes, strength athletes or crossfit enthusiasts can also be affected – particularly when occupational and personal stressors place additional demands on the body.
How overtraining syndrome shows itself
The symptoms of overtraining syndrome are varied and usually develop gradually. They are often initially misinterpreted as temporary fatigue. Doctors broadly distinguish between short-term overload ("overreaching") and a longer-lasting overtraining syndrome, which can persist for several weeks to months.
Physical signs
- Persistent drop in performance despite regular training
- Increased morning resting pulse or altered heart rate response under load
- Muscle soreness that lasts unusually long
- Frequent infections, especially of the upper respiratory tract
- Sleep disturbances, restless sleep or difficulty falling asleep
- Changes in appetite, weight loss
- Susceptibility to injury, tendon complaints or bone stress reactions
Psychological and autonomic signs
- Lack of drive, lack of motivation to train
- Irritability, mood swings, low mood
- Concentration problems
- Inner restlessness or, conversely, severe exhaustion
- In women: changes to or absence of menstruation
If several of these symptoms occur simultaneously and over a longer period, this should be taken seriously. A medical assessment is advisable in order to rule out other causes such as thyroid disorders, iron deficiency, vitamin D deficiency or infections.
Causes: why does the body fall out of balance?
Overtraining syndrome is rarely caused by a single factor. Usually, several factors interact.
Training-related factors
- Too rapid an increase in volume or intensity
- Too few or too short recovery periods between sessions
- Monotonous training without variation
- Lack of periodisation, i.e. no planned alternation between loading and unloading phases
- Too many competitions in quick succession
Lifestyle and external influences
- Occupational or personal stress
- Lack of sleep
- Inadequate or unbalanced nutrition, particularly insufficient energy intake
- Insufficient fluid intake
- Alcohol or nicotine consumption
- Travel, climate change, altitude exposure
Particularly critical is so-called Relative Energy Deficiency in Sport (RED-S) – a situation in which the energy supplied is persistently insufficient to cover both training and the body's basic functions. The hormonal system, bone metabolism and immune system can all suffer as a result.
Recovery in sport: what really matters
Recovery in sport is not a sign of weakness, but an integral part of any good training plan. It is only during the recovery phase that the body adapts to the stimuli – muscles, tendons, the cardiovascular system and the nervous system all become more efficient.
Sleep as the most important pillar of recovery
Key repair and growth processes take place during deep sleep. Seven to nine hours of sleep per night is considered sensible for most adults. Physically active people often benefit from somewhat more sleep, particularly during intense training phases.
Nutrition and fluids
- Adequate energy intake matched to training volume
- Protein evenly distributed across the day
- Complex carbohydrates as the main source of energy
- Sufficient fruit, vegetables and healthy fats
- Regular drinking, ideally water or unsweetened beverages
Active and passive recovery
- Easy sessions at low intensity (e.g. gentle cycling, walking, swimming)
- Mobility and stretching exercises
- Breathing exercises, yoga, meditation
- Sauna, contrast baths or massage may support subjective well-being
Training management
- Planned unloading weeks every three to six weeks
- Variation of training stimuli
- Monitoring of resting pulse, heart rate variability and subjective well-being
- Training diary or digital tools to track progress
When a medical assessment is sensible
Anyone who suspects they are suffering from overtraining syndrome should not try to "train their way out" with even more exercise. Instead, a careful assessment of the situation is important. A medical examination can rule out other causes and provide guidance on how to proceed.
The following may be useful:
- A detailed consultation covering training, sleep, nutrition and stress
- Physical examination
- Laboratory tests (e.g. blood count, iron status, thyroid, vitamin D, inflammatory markers)
- Exercise ECG or sports medicine performance diagnostics
- Further diagnostic tests if required
The most important measure in the case of manifest overtraining syndrome is usually a consistent break from training or a significant reduction in load – often over several weeks. Exactly how long depends on the individual. The body often needs longer than one might expect.
Preventing overtraining: practical tips
- Increase volume and intensity gradually (rule of thumb: no more than around ten per cent per week).
- Build regular rest days and unloading weeks firmly into your plan.
- Pay as much consistent attention to sleep, nutrition and hydration as you do to training.
- Listen to your body's warning signs – such as persistent tiredness or frequent infections.
- Take occupational and personal stress into account when planning your training.
- Seek support where appropriate, from coaches or doctors experienced in sports medicine.
Conclusion
Overtraining usually does not result from a single hard session, but from a lasting imbalance between exertion and recovery. Those who know the warning signs, recover regularly and keep an eye on their lifestyle can significantly reduce the risk. Sensible recovery is not a luxury, but a prerequisite for sustainable performance and health.
This article does not replace medical advice.