Overtraining Syndrome in Cycling: Early Recognition and Recovery

Introduction

“More training is always better”—this belief has led many dedicated Taiwanese cyclists into the trap of overtraining. After weeks of consecutive high-intensity training, you may find your performance stagnating or declining, persistent whole-body fatigue, low mood, and even a growing aversion to riding. This is not a matter of willpower—it is the classic manifestation of Overtraining Syndrome (OTS).

The Physiological Mechanisms of Overtraining

Overtraining is the result of a long-term imbalance between training stress and recovery, involving dysfunction across multiple physiological systems:

Hormonal Imbalance

Chronic high training stress leads to dysfunction of the hypothalamic-pituitary-adrenal (HPA) axis:

• Persistently elevated cortisol: Increases catabolism, hindering muscle repair and synthesis
• Declining testosterone: The testosterone/cortisol ratio (T:C ratio) is a key monitoring metric; a drop of >30% is a warning sign of overtraining
• Reduced growth hormone secretion: Affects tissue repair and body composition

Autonomic Nervous System Dysregulation

• Parasympathetic-type OTS (common in endurance sports): Decreased resting heart rate, abnormal HRV fluctuations, lowered blood pressure
• Sympathetic-type OTS (less common): Elevated resting heart rate, insomnia, increased anxiety

Immune System Suppression

During high-intensity training, NK cell (natural killer cell) activity declines, making athletes more susceptible to colds or upper respiratory infections—a common early sign of OTS.

Classification and Severity of OTS

Early Warning Signs

If 3 or more of the following symptoms are present, training plans should be reassessed immediately:

Physiological signs:

• Resting heart rate 5–10 bpm above your personal baseline (for 3+ consecutive days)
• HRV values persistently below your personal baseline
• Abnormally high or low heart rate at the same power output
• Deteriorating sleep quality (difficulty falling asleep, frequent waking)
• Recurrent upper respiratory infections
• Delayed muscle soreness recovery (DOMS lasting more than 72 hours)

Psychological signs:

• Loss of motivation for training, beginning to dread riding
• Low mood, irritability, decreased concentration
• Increased performance anxiety

Performance signs:

• FTP or maximal power declining in testing
• The same training session feeling noticeably harder (elevated RPE)
• Regressing race or test results

Scientific Prevention Strategies

Monitoring Training Load

• Use the “Acute Training Load (ATL) / Chronic Training Load (CTL)” ratio to track training stress; ATL/CTL >1.5 is a high-risk zone
• Record HRV weekly to establish a personal baseline
• Complete a “Profile of Mood States” (POMS) questionnaire monthly

The Importance of Deload Weeks

Schedule a deload week every 3–4 weeks (reduce training volume by 40–50%, maintain intensity) to allow supercompensation to occur and prevent the accumulation of OTS.

Recovery Strategies

Mild (Functional Overreaching):

• Reduce training volume for 3–7 days, maintaining only low-intensity easy rides
• Increase sleep duration (target 8–9 hours)
• Ensure adequate carbohydrate and protein intake

Moderate to Severe OTS:

• Completely stop structured training for 2–4 weeks
• May engage in unstructured light activity (walking, easy swimming)
• Consult a sports medicine physician to assess hormonal status
• Seek psychological support (sports psychologist if necessary)

Practical Advice

• Taiwanese cyclists often over-push their bodies during the “build phase” before the Wuling KOM; it is recommended to begin systematic tapering 3 weeks before the event
• “Non-training stressors” such as work pressure, exam stress, or family upheaval also deplete recovery resources and should be factored into training load calculations
• Sleep is the most powerful recovery tool—for every hour of sleep lost, next-day maximal power drops by approximately 3–5%
• Keep a training log; three consecutive days of subjective feeling scores below 5 (out of 10) is a trigger point for tapering

Conclusion

Overtraining syndrome is preventable. Listening to your body’s signals, respecting the importance of recovery, and building a scientific monitoring system—these habits are not limiting your training; they are what allow you to progress consistently and sustainably over the long term. The best training is the kind you can keep improving from, uninterrupted, for decades.

Related Reading

• Early Warning Signs of Overtraining in Cycling: Your Body’s Signals to Stop
• Overtraining Syndrome for Cyclists: How to Identify and Recover from Overtraining
• Overtraining Syndrome (OTS): A Complete Scientific Guide to Identification, Prevention, and Recovery
• Overtraining Syndrome: How to Identify, Prevent, and Recover