The science behind recovery at the 4Daagse

Walking 30 to 50 kilometres four days in a row takes more than endurance alone. The body has to deal with repeated muscle damage, fluid retention and fatigue, while recovery time between walking days is limited. Scientific research shows that targeted recovery helps the body cope better with this load, especially when recovery is already part of your preparation. 

Recovery as part of your preparation 

Recovery isn't a solution that only starts during the 4Daagse. The body adapts when it is regularly exposed to recovery stimuli, just as it adapts to walking training. By applying recovery during the period when you are putting lots of kilometres in your legs, you increase your capacity to recover and your resilience. 

Research published in Sports Medicine describes how recovery interventions, such as heat and cold therapy, not only have an acute effect but also contribute to better tolerance of repeated loading when applied consistently. 
Source: https://link.springer.com/article/10.1007/s40279-025-02300-8 

In practice during your preparation: 
After longer walks or periods with several walking days in a row, recovery helps keep your muscles supple, relax faster and be better prepared for the next effort. 

Heat therapy: relaxation and blood flow 

Heat therapy increases blood flow by dilating the blood vessels and supports muscle relaxation. This helps the body remove waste products and deliver oxygen and nutrients to muscle tissue. 

Physiotherapy literature describes these effects of heat in detail: 
https://sportaccentfysiotherapie.nl/waarom-koude-en-warmte-verschillende-effecten-hebben-op-je-herstel/ 

Application for walkers: 
Heat, for example from a sauna or sauna blanket, is well suited to days when you've walked a lot. It supports relaxation, reduces stiffness and contributes to a better night's sleep. 

Myofascial stimulation: keeping muscles supple 

Massage and myofascial techniques, such as massage guns and massage mats, are widely used to reduce muscle tension and maintain freedom of movement. A review in the International Journal of Environmental Research and Public Health shows that these techniques mainly contribute to the subjective feeling of recovery and to reducing stiffness. 
Source: https://www.mdpi.com/1660-4601/18/21/11698 

For the 4Daagse: 
Regular myofascial stimulation helps keep muscles supple during periods when your walking load increases, and makes the body more resilient to consecutive walking days.