Hot, Cold, and Combined Thermodynamic Exposure to Improve Sleep Quality and Sleep-Time Glymphatic Clearance Among Military Cadets
Medical University of South Carolina
Summary
This pilot study investigates the effects of cold-water immersion, traditional sauna use, and their combination on sleep architecture, glymphatic clearance, and psycho-affective health in military cadets. The study uses wearable technologies including the Oura Ring and the Applied Cognition Glymphatic Monitor to collect objective sleep and physiological data.
Description
The study will enroll 45 military cadets from The Citadel Military College, randomized into three groups: Cold-Water Immersion (CWI), High Heat Sauna (HHS), and Combined (COM). Participants will undergo a 7-day baseline period followed by a 14-day intervention. Sleep architecture, glymphatic function, and psycho-affective health will be assessed using validated wearable devices and questionnaires. The study aims to identify intervention-specific improvements in sleep and glymphatic clearance.
Eligibility
- Age range
- 18–30 years
- Sex
- All
- Healthy volunteers
- Yes
Inclusion Criteria: * 18 - 30 years of age * Member of the Ranger Challenge group at The Citadel. * Access to a smartphone with access to appropriate app marketplace (Apple iOS 15, Android 8.0 or newer) and reliable data access. * Ability to access and operate Oura Ring application Exclusion Criteria: * Medical contraindications to continuous wearing of the Oura Ring. * Current diagnosis of neurological, cardiovascular, and/or sleep disorder.
Interventions
- BehavioralCold Water Immersion
Participants will complete 14 daily sessions of cold-water immersion exposure.
- BehavioralHigh Heat Sauna
Participants will complete 14 evening sessions in the high heat sauna
Location
- The Citadel Military CollegeCharleston, South Carolina