Six weeks of polarized functional interval training with large training load reductions does not affect performance gains compared to traditional workouts - Held, Steffen; Isenmann, Eduard; Rappelt, Ludwig; Wiedenmann, Tim; Kutschki, Dominic; Harbrecht, Jannik; Kirchner, Katrin; Geisler, Stephan; Donath, Lars (Frontiers in Physiology, 2024)