Driving Time and Facial Skin Hydration Asymmetry in Florida Drivers
Trial statusRecruiting
Trial phaseNot listed
Trial typeObservational
Biological sexFemale
Age25-65
SponsorIAS Skin Care
About this trial
his observational study examines whether time spent driving is associated with differences in skin hydration between the left and right cheeks in female drivers residing in Florida. In left-hand-drive vehicles, the driver's left cheek is chronically exposed to ultraviolet A (UVA) radiation through the unshaded side window during every daytime driving episode. A prior study by IAS Skin Care (NCT07564869, n=30) found that the left cheek was less hydrated than the right cheek in 60% of participants, suggesting a possible effect of driving-related UVA exposure on facial skin hydration asymmetry.
Eighty female drivers aged 25-65 years residing in Florida will be enrolled. At a single visit, skin hydration will be measured at three facial zones (left cheek, right cheek, and forehead as a symmetrical control zone) using the BT-Analyze bioimpedance device. Participants will complete a structured questionnaire on driving habits, sun protection practices, and skin history. The primary outcome is the Hydration Asymmetry Index (HAI = right cheek minus left cheek BT-Analyze score). Associations between driving time, cumulative driving exposure, window tinting, sunscreen use, and HAI will be examined using Spearman correlation, Mann-Whitney U tests, and multiple linear regression.
Eligibility criteria
This trial accepts healthy volunteersQualifiers
Female sex, aged 25 to 65 years (inclusive)
Valid driver's license and active driving for a minimum of 3 years
Driving frequency of at least 3 days per week on average
Florida residency for a minimum of 2 years prior to enrollment
Disqualifiers
Window tinting on the driver-side window of the participant's primary vehicle
Regular sunscreen application specifically to the left side of the face before driving (more than half of driving occasions in the past month)
Active skin disease on the face at time of assessment
Injectable cosmetic procedures (Botox or fillers) in the past 6 months
Trial population
Convenience sample of female drivers aged 25-65 years residing in Florida, recruited from an esthetics practice client base and referral networks in the Orlando metropolitan area.
Trial design
Design model
Case-only
Time perspective
Cross-sectional
Treatments tested in this trial
BT-Analyze bioimpedance skin hydration measurement
Other interventionNon-invasive skin hydration measurement at three facial zones (right cheek, left cheek, forehead) using the BT-Analyze bioimpedance device. Three measurements per zone. Single visit.
Treatment groups
80 Participants
are divided into 1 treatment groupGroup A: Female Florida Drivers1 intervention
Trial outcomes
Primary outcomes
1
Hydration Asymmetry Index (HAI)
Difference in mean BT-Analyze bioimpedance scores between the right and left cheeks (HAI = right cheek mean minus left cheek mean). A positive value indicates lower hydration on the left cheek relative to the right.
Time frame
Single visit (Day 1)Secondary outcomes
1
Correlation between cumulative driving exposure and HAI
Spearman correlation between cumulative driving exposure index (years of driving × hours per week) and the Hydration Asymmetry Index.
Time frame
Single visit (Day 1)2
HAI by window tinting status
Comparison of Hydration Asymmetry Index between participants with tinted versus untinted driver-side windows, assessed by Mann-Whitney U test.
Time frame
Single visit (Day 1)3
HAI by sunscreen application habit
Comparison of Hydration Asymmetry Index between participants who regularly apply sunscreen to the left side of the face before driving and those who do not, assessed by Mann-Whitney U test.
Time frame
Single visit (Day 1)4
Forehead hydration as symmetry reference
Forehead BT-Analyze score used as a bilateral symmetry reference zone to confirm that observed cheek asymmetry is directional and not attributable to general hydration differences.
Time frame
Single visit (Day 1)Sponsors and contacts
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Source ClinicalTrials.gov