Crossover trial of the effects of a far-infrared heater that heats the feet with ceramic balls on autonomic nervous activity and mood states.

Introduction: The accumulation of fatigue and stress creates problems, including reductions in quality of life and productivity.

Objectives: To investigate the effects of a far-infrared heater that heats the feet with ceramic balls on autonomic nervous activity and mood states.

Methods: This study was performed as a crossover trial.