This article explains exactly what the HbA1c value is, how it can be influenced by exercise – especially endurance training – and why it is also relevant for healthy, athletic people.
What exactly is the HbA1c value?
The HbA1c value indicates how much sugar is bound to your red blood cells (hemoglobin) in the long term . This occurs through a process called glycation – a natural chemical process. The higher the average blood sugar level over the last 8 to 12 weeks , the higher the HbA1c value will be.
The units:
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In Germany, the percentage is usually given.
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An HbA1c level of 5.0% to 5.6% is considered normal.
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5.7% to 6.4% = prediabetes .
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A level of 6.5% or higher indicates type 2 diabetes .
Why should a road cyclist know their HbA1c level?
Even if you feel fine, a high HbA1c level can be a warning sign – long before symptoms appear. This value is particularly relevant in the following contexts:
1. Early detection of metabolic problems ✅
Even slim, athletic people can be insulin resistant – an early stage of type 2 diabetes. The HbA1c test can provide initial indications. And the sooner you take action, the better.
2. Optimization of energy supply ✅
Stable blood sugar levels ensure better energy availability during training and competition. Those who experience significant blood sugar fluctuations risk performance drops, cravings, or concentration problems – all things you want to avoid during interval training or long rides.
3. Long-term health ✅
A persistently elevated HbA1c level is not only associated with diabetes, but also with an increased risk of cardiovascular disease – even in seemingly "healthy" individuals. Cyclists who take their health seriously should therefore keep an eye on it.
Long-term blood sugar levels in competitive sports: What counts at the Tour de France?
In professional cycling – for example, at the Tour de France – nothing is left to chance. Besides VO₂max , lactate levels, and power output , blood sugar also plays a central role in performance management. Many teams now use continuous glucose monitoring (CGM) to observe blood sugar levels in real time – and thus optimally coordinate energy intake, exertion, and recovery.
But it's not just the moment that counts. The HbA1c level is also regularly checked to ensure that the driver remains metabolically healthy – despite high exertion and sometimes extremely carbohydrate-rich diets during races.
Typical strategies in the professional peloton:
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Targeted carbohydrate intake : depending on exertion, stage profile and body weight, gels, bars and drinks are precisely dosed.
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Training in different metabolic states (e.g., fasted vs. carbohydrate-supplied) to promote metabolic flexibility
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Regeneration as the key : Only those who maintain balance can consistently deliver peak performance – an excessively high HbA1c level would be a warning sign of overexertion, poor nutrition, or insufficient recovery.
In short: Even in high-performance sports, a stable HbA1c is an indicator of good control of stress and nutrition – and therefore of sustainable performance.
What amateur athletes can learn from this
You don't have to be a professional to benefit from the knowledge of the tour teams. On the contrary: especially in amateur sports, one's own metabolism is often underestimated. Those who adopt the following principles can improve performance, recovery, and health simultaneously :
🛠 Practical tips for amateur cyclists:
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Regularly check your blood levels – not just HbA1c, but also fasting glucose and insulin if necessary.
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Training on an empty stomach or with reduced carbohydrate intake (e.g., easy sessions in the morning) promotes fat burning and lowers HbA1c in the long term.
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Use carbohydrates strategically : More isn't always better. During training, yes – in everyday life, opt for high-quality, fiber-rich carbohydrates in moderate amounts.
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Take regeneration seriously : Good sleep, stress management and micronutrients play an important role – also for blood sugar.
💡 Conclusion for amateur cyclists: Keeping an eye on your HbA1c level not only helps you stay healthy but also allows you to train more effectively. Long-term blood sugar levels thus become a silent ally on the path to greater endurance and resilience – whether on a recreational cycling event or a challenging stage through the low mountain ranges.
How does road cycling affect HbA1c levels?
Regular endurance training is one of the most effective ways to lower or maintain a low HbA1c level. Studies show that even moderate exercise over several weeks can measurably improve this level. The following are particularly effective:
💡 Fun Fact: Just 150 minutes of endurance training per week can significantly lower the HbA1c level – completely without medication.
Nutrition & HbA1c – what should you pay attention to?
The quality of carbohydrates is also crucial for athletes. Especially relevant:
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Long-chain carbohydrates instead of sugar bombs
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Lots of vegetables, fiber & healthy fats
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Minimally processed foods
Energy bars, gels, and isotonic drinks have their place in training – but in everyday life, the focus should be on maintaining a stable blood sugar balance. Consuming a lot of sugar on a regular basis is not good for your HbA1c, even if it seems to "raise" it.
When should you get your HbA1c tested?
Even if you have no symptoms, an annual check-up with your family doctor or sports medicine specialist can be beneficial – especially if:
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diabetes runs in your family
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You are over 40
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You are often tired, lethargic, or hungry
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You want to actively optimize your health
For those who prefer self-monitoring, home tests are now available, such as finger prick tests. However, a laboratory test is generally more accurate.
Cycling as medicine – without a prescription
For those looking to lower or maintain their HbA1c level, road cycling is one of the most effective and enjoyable methods available. The rhythmic movement, aerobic training, and fresh air act as a natural metabolism booster. Studies show that even moderate endurance exercise over several weeks can significantly improve long-term blood sugar levels – entirely without medication.
It doesn't have to be an Alpine stage. Even leisurely tours in the lowlands, regular rides after work, or weekend excursions produce measurable results. And those with physical limitations or who don't (yet) feel confident enough can also start with an e-bike – the exercise remains, only the barrier to entry is lower.
Conclusion: A blood value that should not be ignored
The HbA1c value is far more than just a diabetes-specific lab value – it's a long-term indicator of metabolic health that's also relevant for ambitious cyclists. Those who regularly ride road bikes can not only improve their performance through targeted training and a tailored diet, but also positively influence their long-term blood sugar levels.
