How to tell you're not recovering

Progress in sport happens not during training but between sessions. If recovery consistently fails to keep pace with the loads, results stall or decline, while the risk of injury and illness grows. The trouble is that the body sends its signals gradually, and they are easy to write off as «a bad day». The editors have gathered the signs, tools and markers that help you spot under-recovery in time.

Fatigue as the norm and as a signal

Temporary fatigue after a hard training block is normal and even desirable. In sports science this is called functional overreaching: performance drops for a few days, but after rest it rises to a new level. Shock microcycles and training camps are built on exactly this principle.

The problem begins when performance does not return after ordinary rest. The ECSS and ACSM consensus (Meeusen et al., 2013) distinguishes non-functional overreaching, in which recovery takes weeks, from overtraining syndrome, which can drag on for months. The line between them is drawn largely in retrospect — by how much time it took to regain form.

Importantly, under-recovery is rarely tied to training alone. Sleep, nutrition, psychological stress, illness, travel — all of it adds to the overall «account» of load. An athlete training on the same plan can suddenly stop recovering during exam season or a stretch of life troubles.

Energy deficit deserves a separate mention. The IOC consensus on RED-S (2018) shows that a chronic shortfall of energy relative to expenditure leads to hormonal, immune and bone disturbances whose symptoms closely resemble overtraining. That is why assessing nutrition is a mandatory step.

Subjective signs: what your well-being tells you

The most sensitive monitoring tool is often the athlete himself. The systematic review by Saw and colleagues (2016) showed that subjective questionnaires (mood, fatigue, sleep quality, muscle soreness, stress) respond to changes in load more sensitively and consistently than most common biochemical and physiological measures.

The most frequent early signs of under-recovery are a feeling of «heavy legs» already during the warm-up, an inability to handle usual weights or pace, and a raised perceived difficulty of a standard workout. If the same work suddenly feels much harder, that is a warning sign.

• worsening sleep: difficulty falling asleep despite fatigue, frequent awakenings, morning grogginess;
• reduced motivation and desire to train, apathy or irritability;
• prolonged muscle soreness that does not pass within 3–4 days;
• changes in appetite, unplanned weight loss;
• frequent colds, cold sores, slow healing of minor injuries;
• in women — menstrual cycle disturbances.

For these signals to work, they must be recorded regularly rather than recalled once things are already bad. A simple daily questionnaire of 4–6 items rated on a scale from 1 to 5 takes a minute. What matters is not the absolute figures but the trend over 7–14 days compared with your usual baseline.

The subjective rating of perceived exertion (RPE) after each workout is also useful. Multiplied by the session duration in minutes, it gives so-called «session RPE» — a simple, validated way to count internal load and see when it spikes.

Objective measures: heart rate, HRV, tests

Resting morning heart rate is the most accessible physiological marker. It is measured immediately after waking, lying down, under identical conditions. A steady rise of a few beats above your personal baseline over several days may indicate incomplete recovery, the onset of illness or dehydration.

Heart rate variability is considered more informative. Plews and colleagues (2013) showed that in endurance athletes it is useful to look not at single measurements but at the 7-day rolling average and its fluctuations. A prolonged decline in HRV relative to personal baseline may point to under-recovery, though in some cases overreaching is, on the contrary, accompanied by an atypical rise in the metric.

Performance tests give a direct answer to the main question — whether the athlete is ready to work. This may be vertical jump height from a standstill, bar speed at a standard weight, time on a control segment or heart rate at a fixed power output. A consistent drop in the metric under stable conditions is a strong argument in favor of a deload.

Any objective measure makes sense only in comparison with your personal baseline. Comparing your HRV or heart rate with other people's figures is pointless: individual differences are large.

Laboratory markers and their limits

Athletes often want to «get tested for overtraining», but no such test exists. The Meeusen et al. consensus states plainly: no single biochemical marker allows overtraining syndrome to be diagnosed reliably. The laboratory is useful primarily for ruling out other causes of fatigue.

Creatine kinase can rise several-fold after a hard workout, and this in itself does not mean poor recovery. It is useful for comparison with your own history and for detecting rare but dangerous conditions such as rhabdomyolysis.

Baseline tests — a complete blood count, ferritin, thyroid function, vitamin D — are reasonably done at the start of the season to obtain a «reference point». Then, when symptoms appear, the doctor will have something to compare against.

Any deviations in the tests should be interpreted by a doctor, not on your own. Anemia, hypothyroidism, infections, depression and the aftermath of viral illness can masquerade as «overtraining» and require treatment, not merely rest.

What to do when the signs accumulate

The first step is to reduce the load without waiting until things get truly bad. A few days of easy training or a short deload week are far more effective than a forced month-long break. Often it is enough to cut volume by a third to a half while keeping part of the intensity.

The second step is an audit of the basics. How many hours do you actually sleep? Are you getting enough calories and carbohydrates for your workload? Have stress, flights or illness been added lately? Often the answer is found right here rather than in the training plan.

The third is monitoring the dynamics. If after 1–2 weeks of reduced load, normal sleep and nutrition the metrics do not return to baseline, that is a reason to see a sports physician for a full examination.

The fourth is prevention. Plan deloads in advance, build volume gradually, keep a well-being diary. The recovery consensus of Kellmann and colleagues (2018) stresses that recovery should be just as planned a part of preparation as training itself.

Editorial conclusions

Under-recovery develops gradually, and it shows first in well-being: poorer sleep, loss of motivation, a rise in the perceived difficulty of usual workouts.

Morning heart rate, HRV and simple performance tests help confirm the problem when you look at trends relative to your own baseline.

Laboratory tests do not diagnose overtraining, but they let you rule out anemia, thyroid problems and other causes of fatigue.

We also recommend reading our materials on stress and cortisol in athletes, on muscle soreness and ways to reduce it, and on meditation and breathing practices.

References

1. Meeusen R, Duclos M, Foster C, et al. Prevention, diagnosis, and treatment of the overtraining syndrome: joint consensus statement of the ECSS and the ACSM. Med Sci Sports Exerc. 2013;45(1):186–205.
2. Saw AE, Main LC, Gastin PB. Monitoring the athlete training response: subjective self-reported measures trump commonly used objective measures: a systematic review. Br J Sports Med. 2016;50(5):281–291.
3. Halson SL. Monitoring training load to understand fatigue in athletes. Sports Med. 2014;44(Suppl 2):S139–S147.
4. Plews DJ, Laursen PB, Stanley J, et al. Training adaptation and heart rate variability in elite endurance athletes: opening the door to effective monitoring. Sports Med. 2013;43(9):773–781.
5. Kellmann M, Bertollo M, Bosquet L, et al. Recovery and performance in sport: consensus statement. Int J Sports Physiol Perform. 2018;13(2):240–245.
6. Mountjoy M, Sundgot-Borgen JK, Burke LM, et al. IOC consensus statement on relative energy deficiency in sport (RED-S): 2018 update. Br J Sports Med. 2018;52(11):687–697.