Overtraining in runners

Overtraining in runners is an imbalance between training load and the body’s capacity to recover. When sessions become too frequent or too intense, or when rest periods are insufficient, the body no longer has time to adapt properly.

Normally, training causes temporary fatigue followed by a recovery phase that leads to improved performance. With overtraining, recovery becomes insufficient, fatigue builds up and performance gradually declines. In runners, this can lead to persistent fatigue, reduced performance and various physical or psychological problems. This syndrome can affect beginner runners and experienced athletes alike.

Overtraining does not only affect elite athletes: recreational runners can also be affected, particularly when preparing for a marathon or an ambitious goal. Highly motivated runners preparing for a demanding goal are particularly at risk.

Training-related factors

A sudden increase in weekly mileage can exceed the body’s capacity to adapt. Repeated interval sessions, races or long runs can also greatly increase the physiological load.

Factors related to recovery and lifestyle

Insufficient sleep or a lack of rest days promotes the onset of chronic fatigue. Work, family or emotional stress can add to training stress and limit recovery. The main risk factors are therefore a rapid increase in mileage, back-to-back races, insufficient recovery, poor-quality sleep, an inappropriate diet and significant psychological stress.

Overtraining often shows itself gradually over the weeks of training through persistent fatigue, reduced performance, a feeling of heavy legs, a higher heart rate during exercise, sleep disturbances, irritability or reduced motivation, as well as recurrent injuries.

When to see a doctor?

A consultation may be useful if fatigue persists for several weeks, if performance declines despite training, if injuries keep recurring, or if the motivation to run disappears. A healthcare professional or a sports medicine specialist can assess the situation and suggest adjustments to training.

Preventing overtraining relies on gradual training planning (lighter weeks, a measured increase in volume, recovery periods), respecting rest days and paying close attention to your body’s signals. Attention to sleep, diet and hydration also helps you keep running sustainably.