Overreaching & Overtraining: Knowing When to Back Off

Three states

A short-term drop in performance after hard training that turns into improvement after recovery is functional overreaching. When the balance between training and recovery is not respected, non-functional overreaching can follow, and overtraining syndrome is marked by prolonged maladaptation. The 2013 joint consensus statement of the European and American sports medicine colleges says the line between the last two is very difficult to draw, depends on the clinical outcome and on excluding other causes¹. From the inside you cannot tell which state you are in, so act on the pattern and act early.

What it looks like

No single marker is definitive. A 2013 consensus statement says hormones, performance tests, psychological tests and biochemical and immune markers are all used, and none meets the criteria for general acceptance¹. In a 2021 systematic review of 12 studies of endurance athletes, functional overreaching showed up in power output, submaximal and recovery heart rate, perceived exertion and two athlete questionnaires, but not in maximal oxygen uptake or heart rate variability². A watch score is one input, and how the run felt outranks it.

In 24 recreational runners put through a two-week overload, the 8 who were overreached had a nocturnal heart rate 3.2% higher, a larger drop in readiness to train and a larger rise in leg soreness, while the runners who responded well had a heart rate 2.8% lower. Tolerance varied substantially between runners³. Compare your resting heart rate and your readiness with your own baseline and not with anyone else's. A line a day on sleep, mood, motivation and how the run felt makes a pattern easier to see.

Watch for a cluster across several days and not a single bad session:

• Performance flat or falling despite continued hard training.
• Workouts that feel harder than they should at your usual paces.
• Easy-run heart rate that stays high when it is not hot.
• Persistent heavy legs and fatigue.
• Disrupted sleep, low mood or loss of motivation to run.

What to do

The common reaction to feeling flat is to push harder. Do the opposite, in this order. The guides on rest days and training load and recovery cover the rest and the rebuild:

1. Look for the simple causes first: not enough food, low iron, poor sleep, or too little space between hard efforts.
2. Shrink the load without stopping. Split easy runs, for example two 30-minute runs instead of one hour, and keep a few strides.
3. Take a recovery block of four days to a week: one or two full rest days and easy running the rest of the time. Let how your performance and readiness respond, and not the calendar, tell you when to resume hard work.
4. If the decline has lasted several weeks, take real downtime and rebuild in order: frequency first, running most days even for 15 minutes, then duration, then intensity. Choose sessions you can finish well, so you win more workouts than you lose.

When to see a clinician

Per the 2013 consensus statement, a clinician works out overtraining syndrome by excluding organic disease, infections, caloric restriction (negative energy balance), insufficient carbohydrate or protein intake, iron deficiency, magnesium deficiency, allergies and other factors, together with identifying the events that triggered it¹. A decline in performance with persistent fatigue or low mood that does not lift after a couple of easy weeks is worth taking to a clinician, who can look for those causes. The couple of weeks is a rule of thumb and not a tested threshold.