Preliminary Study on a Hydroptical Thermal Display for Bathing with Spatial Temperature Control

Ichihashi Sosuke, Inami Masahiko, Ho Hsin-Ni, Noura Howell

doi:10.32279/jjhr.202545j05

【Background】People have long engaged in various bathing to achieve physiological and mental benefits. This study aims to create a fast-switching, spatial hot- and cold-water bathing experience using hydroptical thermal feedback, which alters the perceived water temperature by heating the skin with light. This may enhance the effects of muscle fatigue relief and mental recovery by introducing localized and rapid hot-cold stimulation into conventional bathing practices.【Methods】A hydroptical thermal display system was designed to rapidly alter the perceived water temperature over the entire forearm or a localized area. A preliminary study was conducted to assess whether rapid water temperature changes could occur across the entire forearm and in specific localized regions.【Results】Participants reported perceiving overall and localized temperature changes across the forearm. Additionally, issues such as unnatural posture, changes in actual water temperature, and the noise were reported.【Conclusion】The results suggest that this device can induce both overall and localized water temperature changes in the forearm. However, further improvements to the device are necessary, as well as a more controlled study involving more participants to investigate the perceptual characteristics and recovery effects.

Preliminary Study on a Hydroptical Thermal Display for Bathing with Spatial Temperature Control

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