The science behind recovery at the 4Days

Walking 30 to 50 kilometers for four days in a row requires more than just endurance. The body experiences repetitive muscle damage, fluid retention and fatigue, while recovery time between walking days is limited. Scientific research shows that targeted recoveryhelps to better absorb this load, especially when recovery is already underway in preparation is taken. 

Recovery as part of the preparation 

Recovery is not a solution that only starts during the 4 Days. The body adapts when it is regularly exposed to recovery stimuli, just as it adapts to walking training. By applying recovery during the period in which you... gets a lot of miles in his legs, you increase your recovery capacity and resilience. 

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

Practical in preparation: 
After longer walks or periods of several walking days in a row, recovery helps to keep muscles more flexible, relax faster and be better prepared for the next effort. 

Heat therapy: relaxation and blood circulation 

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

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

Application for hikers: 
Heat, for example via a sauna or sauna blanket, is suitable after days of walking a lot. It supports relaxation, reduces stiffness and contributes to a better night's sleep. 

Myofascial stimulation: keep muscles flexible 

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 the reduction of stiffness. 
Source: https://www.mdpi.com/1660-4601/18/21/11698 

For the 4 Days: 
Regular myofascial stimulation helps to keep muscles flexible during periods when the walking load increases, and makes the body more resistant to consecutive walking days.