Working… Menu

Two Consecutive Sunscreen Applications Optimize Sun Protection

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03033654
Recruitment Status : Completed
First Posted : January 27, 2017
Last Update Posted : January 27, 2017
Information provided by (Responsible Party):
Ida M. Heerfordt, Bispebjerg Hospital

Brief Summary:
The investigators aim to investigate how much two consecutive applications of sunscreen before sun exposure can increase the quantities of sunscreen applied and decrease the skin area left without sunscreen compared to a single application. Volunteers wearing swimwear applied sunscreen in a laboratory environment twice and had pictures taken in black light before and after. As sunscreens absorb black light the darkness of the skin increased with increasing amounts of sunscreen applied. The investigators conducted a standard curve establishing a link between picture darkness and applied sunscreen quantity. Participants were asked to apply sunscreen the way they would normally do but two consecutive times. No other advice was given. The level of protection was determined by picture analysis as measurements of darkness of selected skin sites as well as the percentages of skin area left without sunscreen in different body regions and in total.

Condition or disease Intervention/treatment Phase
Sun Protection Other: Sunscreen, Actinica Not Applicable

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 31 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: Two Consecutive Sunscreen Applications Optimize Sun Protection
Actual Study Start Date : February 2015
Actual Primary Completion Date : February 2015
Actual Study Completion Date : February 2015

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Sun Exposure

Arm Intervention/treatment
Experimental: Intervention
Two Consecutive Sunscreen Applications
Other: Sunscreen, Actinica
Two Consecutive Sunscreen Applications

Primary Outcome Measures :
  1. Sun protection [ Time Frame: The day of intervention. Sun protection will be assessed right after sunscreen application. ]
    Sun protection will be determined as sunscreen quantities applied in mg/cm^2 and areas of covered skin in percentage.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Gender Based Eligibility:   Yes
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy Caucasians between older than 18

Exclusion Criteria:

  • Suffering from a skin disease, were allergic to the content in sunscreen, were pregnant or breastfeeding
Layout table for additonal information
Responsible Party: Ida M. Heerfordt, MD, Bispebjerg Hospital Identifier: NCT03033654    
Other Study ID Numbers: H-1-2014-094
First Posted: January 27, 2017    Key Record Dates
Last Update Posted: January 27, 2017
Last Verified: January 2017
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

Layout table for additional information
Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
Layout table for MeSH terms
Sunscreening Agents
Radiation-Protective Agents
Protective Agents
Physiological Effects of Drugs
Dermatologic Agents