Recognizing Overtraining Syndrome: 6 Body Warning Signs You Should Not Ignore

Introduction

“Overtraining Syndrome (OTS)” is the state endurance athletes fear most—not just ordinary fatigue, but a “systemic breakdown of the body.” In mild cases, recovery takes 2 weeks; in severe cases, athletes cannot return to their previous form for six months. Many amateur riders fall victim to OTS while preparing for Wuling or Taroko. This article teaches you how to recognize the warning signs, prevent it, and recover.

Overtraining vs. Functional Overreaching

Sports science distinguishes three stages:

FOR is a normal training phenomenon, NFOR requires immediate volume reduction, and OTS is already a medical issue.

6 Major Warning Signs

Warning Sign 1: Elevated Resting Heart Rate

Measure your resting heart rate every morning upon waking. If it is more than 7 bpm above your normal for 5 consecutive days, you may be in NFOR. For example, if your normal is 50 bpm, and it stays above 58 bpm for 5 consecutive days.

Warning Sign 2: Decreased HRV (Heart Rate Variability)

If HRV drops below 80% of your normal and persists for 7 consecutive days, it is a sign of excessive fatigue. Whoop, Garmin, and Polar can all measure this.

Warning Sign 3: Heart Rate Rises or Falls at the Same Intensity

Interestingly, in the later stages of OTS, heart rate actually “cannot spike”—during a 5-minute Z5 workout, your heart rate cannot reach 170, accompanied by a feeling of weakness.

Warning Sign 4: Declining Sleep Quality

Difficulty falling asleep, waking up in the middle of the night, light sleep with many dreams. OTS is often accompanied by elevated cortisol, which affects sleep.

Warning Sign 5: Mood Changes

Becoming irritable, depressed, and losing enthusiasm for training. The POMS (Profile of Mood States) is a common tool in sports psychology.

Warning Sign 6: Weight Changes

Sudden weight loss of more than 2 kg (cortisol breaking down protein), or increased water retention.

Risk Factors

Prevention Strategies

• Mandatory recovery week every 4 weeks: Cut training volume by 40–50%
• Monthly CTL increase < 8 points
• Record resting heart rate daily
• If TSB < -25, reduce volume immediately
• Adequate sleep of 7–8 hours
• Caloric balance—eat 300–500 kcal more on training days
• Start tapering 3 weeks before an A-priority race

NFOR Rescue Plan

If you have already entered NFOR, execute the following immediately:

• 5–7 days of complete rest (do not “ride easy”—it will prolong recovery)
• Prioritize sleep: 9 hours/day
• Increase food intake: carbohydrates + protein
• HRV monitoring: only resume training after HRV recovers to 95% of normal
• Training resumption intensity: focus on Z2, starting with 4 hours per week

Common Cases Among Taiwanese Riders

Case 1: A working professional rider preparing for Wuling started training 15 hours per week in March. By the end of May (4 months before the race), he was already in NFOR and was ultimately forced to withdraw from the race in September. Mistake: training volume increased too quickly.

Case 2: A retired rider thought having more time meant he could train more. He raised his monthly CTL from 60 to 95, and after 3 months he developed OTS, taking six months to recover. Mistake: monthly CTL increase exceeded 10 points.

Practical Advice

First, “skipping a week of training will not cost you fitness”—research indicates that VO2max drops only 2–4% after 7 days of no training, but rest can improve the quality of subsequent training by 20%. Second, reduce volume the moment warning signs appear—do not wait and say “I can push through one more week.” Third, life stress also counts as load—during major projects or family events, proactively reduce training volume by 30%. Fourth, HRV is the best tool, more sensitive than resting heart rate. Fifth, Taiwan’s hot, humid summers increase OTS risk by 30%; from June to August, it is recommended to drop intensity by one level.

Conclusion

OTS is not a matter of “weak willpower,” but rather a “training plan error.” Every rider struck down by OTS thought they could “push through a little longer”—and that is exactly where the danger lies. Treat recovery as part of training, and view rest as an investment rather than laziness. Remember: “No Pain, No Gain is a gym slogan, not a road cycling philosophy. No Recovery, No Adaptation is the truth.”

Related Reading

• Cycling Overtraining Syndrome: 7 Warning Signs and Recovery Strategies (Amateur Rider Edition)
• Overtraining Syndrome Detection Guide: Recognizing Warning Signs to Avoid Training Breakdown
• Early Warning Signs of Overtraining: How to Spot Fatigue Accumulation Before Breakdown
• Warning Signs of Running Overtraining: How to Recognize Overtraining Syndrome