Mechanism and action behind contrast bathing

Is the action and its mechanism regarding contrast bathing and recovery known yet, since it seems contrast bathing is unlikely to directly stimulate to vasoconstriction, vasodilation and increased circulation deep in the muscle?

There`s Finnish research done about contrast showers, more closely it was done about benefits of “avanto uinti” which means going from sauna to cold water for a quick swim. I got problems about translation of few words but I try to do it today.

Just my two cents…

contrast showers…

take a look…just trying to find out what Charlie and Waldemar did…

Carl