Assessing the Effect of Cool Roofs on Health Using Smartwatches: a Global Multi-center Study
NCT Number: NCT06579963
Acronym: REFLECT
Status: NOT_YET_RECRUITING
Study Type: INTERVENTIONAL
Phases: NA
Conditions: Heart Rate|All-day Steps|Distance Walked|Active Minutes|Moderate-intensity Activity Minutes|Vigorous-intensity Activity Duration|Sleep Quantity|Time in Sleep Stages|Awake Duration|Sleep Score
Sponsor: Aditi Bunker
Sex: ALL
Age: ADULT, OLDER_ADULT
Enrollment: 800
Study Design: Allocation: RANDOMIZED|Intervention Model: PARALLEL|Masking: DOUBLE (INVESTIGATOR, OUTCOMES_ASSESSOR)|Primary Purpose: PREVENTION
Start Date: 2024-09-02
Completion Date: 2026-01-31

Summary:
Ambient air temperatures in Asian, Latin American, African, and Pacific climate hotspots have broken record highs in 2024. Solutions are needed to build heat resilience in communities and adapt to increasing heat from climate change. Sunlight-reflecting cool roof coatings may passively reduce indoor temperatures and energy use to protect home occupants from extreme heat. Occupants living in poor housing conditions globally - for example in informal settlements, slums, and low-socioeconomic households - are susceptible to increased heat exposure.

Heat exposure can instigate and worsen numerous physical, mental and social health conditions. The worst adverse health effects are experienced in communities that are least able to adapt to heat exposure. By reducing indoor temperatures, cool roof application may improve heart health, sleep and physical activity in household occupants.

The long-term research goal is to identify viable passive housing adaptation technologies with proven health benefits to reduce the burden of heat stress in communities affected by heat globally. To meet this goal, the investigators will use smartwatches to measure the effects cool roof application on heart health, sleep and physical activity in four urban climate hotspots: Ouagadougou, Burkina Faso; Hermosillo, Mexico; Ahmedabad, India; and Niue, Oceania.

Primary Outcome Measures: Heart rate, Heart rate in beats per minute measured at 15-second intervals using Garmin Vivosmart 5 devices., Smartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at baseline and seven over 12 months, covering three consecutive hottest months and four alternate months.
Secondary Outcome Measures: All-day steps, The number of steps measured daily using Garmin Vivosmart 5 devices., Smartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at baseline and seven over 12 months, covering three consecutive hottest months and four alternate months.|Active minutes, The total number of minutes of active exercise daily using Garmin Vivosmart 5 devices., Smartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at baseline and seven over 12 months, covering three consecutive hottest months and four alternate months.|Distance walked, The total distance walked daily using Garmin Vivosmart 5 devices., Smartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at baseline and seven over 12 months, covering three consecutive hottest months and four alternate months.|Moderate-intensity activity minutes, The total number of minutes of moderate-intensity activity daily using Garmin Vivosmart 5 devices., MeasuSmartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at barements will be taken continuously for 12 months. Participants will be asked to wear their smartwatch for at least two weeks every month.|Vigorous-intensity activity duration, The total number of minutes of vigorous-intensity activity daily using Garmin Vivosmart 5 devices., Smartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at baseline and seven over 12 months, covering three consecutive hottest months and four alternate months.|Sleep quantity, The number of hours spent asleep each night using Garmin Vivosmart 5 devices., Smartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at baseline and seven over 12 months, covering three consecutive hottest months and four alternate months.|Time in sleep stages, The number of hours spent in sleep stages each night using Garmin Vivosmart 5 devices., Smartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at baseline and seven over 12 months, covering three consecutive hottest months and four alternate months.|Awake duration, The number of hours spent awake during sleep time each night using Garmin Vivosmart 5 devices., Smartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at baseline and seven over 12 months, covering three consecutive hottest months and four alternate months.|Sleep score, The Garmin sleep score (0-100) each night using Garmin Vivosmart 5 devices., Smartwatches will be worn for two consecutive weeks per month. Eight measurement points will be taken: one at baseline and seven over 12 months, covering three consecutive hottest months and four alternate months.