Heavy legs around 15 km? This is what happens in your body

Many walkers recognize it during the preparation for the 4 Days. The first kilometers go smoothly, but somewhere around 15 to 20 kilometers the legs start to feel heavier. 

The pace drops slightly, muscles feel stiffer and the effort seems greater. That's no coincidence. During prolonged exercise, various processes take place in your muscles and in your brain. 

What happens in your muscles during a long walk? 

Your body mainly uses energy during longer walks carbohydrates and fats as an energy source. As the effort lasts longer, the glycogen stores in the muscles gradually decreases. Glycogen is the stored form of carbohydrates and an important fuel for muscle activity. 

Research into endurance exercise shows that lower glycogen availability can contribute to: muscle fatigue and a heavier feeling in the legs. Studies on glycogen availability and muscle performance show that reduced glycogen stores are an important factor in fatigue during prolonged exercise. 

In addition, problems arise during prolonged exertion minor damage to muscle fibers. This process, too exercise-induced muscle damage mentioned, is a normal part of training. During recovery, the body repairs these fibers and adapts, ultimately making muscles stronger and more resilient. 

Research into long-term walking loads shows that clear increases occur in markers of muscle damage and muscle fatigue after long-term loads for distances of 15 to 50 kilometers. 

This is exactly why recovery plays such an important role in preparing for the 4 days. 

Sources: 

Fatigue is not just in your legs 

It also plays a role during long periods of exertion nervous system a role. When energy stores decrease and muscles become fatigued, the brain receives signals that the effort is becoming strenuous. 

This can lead to: 

This combination of physical and mental fatigue is a well-known phenomenon during endurance exercise. 

Why recovery is so important 

The kilometers you make are important, but... real training progression happens during recovery. 

In the hours and days after a workout: 

Sufficient recovery helps to prevent fatigue from building up and to start the next training session with fresh legs. 

Practical tips for recovery and energy 

Hydration: more than just water 

During long walks you lose moisture through sweating. That goes too electrolytes lost, such as sodium and potassium. These play an important role in fluid balance and muscle function. 

Practical tips: 

Energy while walking 

During prolonged exercise, the body mainly uses energy carbohydrates as fuel. 

For longer workouts, it can help to get small amounts of energy while walking, for example: 

This helps to replenish energy stores and delay fatigue.  

Post-workout nutrition 

After training, the body needs building materials for recovery. 

A combination of carbohydrates and proteins can help with: 

For example: 

Walk and stretch 

After a long walk a short cooling-down help to gradually calm the body. 

A gentle walk for a few minutes helps keep circulation going and supports muscle recovery. Then you can light stretching help to reduce muscle tension and maintain mobility. 

Rest and recovery methods 

Sleep and relaxation are essential for recovery of both muscles and the nervous system. In addition, many walkers use various recovery methods to stimulate blood flow and help relax muscles, such as: 

Compression 
For example with recovery boots or compression sleeves to support circulation in the legs. 

Massage 
Massage can help reduce muscle tension. This can be done with one massage mat or for example a massage gun. 

Heat 
Heat can contribute to muscle relaxation and stimulation of blood circulation. For example, some athletes use one for this infrared sauna blanket. 

Cold therapy 
Cold baths or ice baths are sometimes used to reduce inflammatory responses and muscle soreness after strenuous exercise. The effect may differ per person, but in certain situations it is possible cold therapycontribute to recovery after intensive strain. 

Recovery as part of your preparation for the 4 Days 

While preparing for the 4 days the emphasis is often on making kilometers. Yet it is the balance between load and recovery at least as important. 

By consciously paying attention to recovery through nutrition, hydration, rest and recovery methods, you help your body to adapt to the training load. This way you not only work on strong legs, but also on a fresh head for the next training kilometers. 

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