Bright Light Therapy for Weight Loss

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: NCT00406770
Recruitment Status : Completed
First Posted : December 4, 2006
Last Update Posted : October 19, 2009
Information provided by:
Russian Academy of Medical Sciences

Brief Summary:
The study investigates whether bright artificial light adds to hypocaloric diet to lose weight in obese subjects.

Condition or disease Intervention/treatment Phase
Obesity Device: Light therapy Not Applicable

Detailed Description:
The study is aimed to check a preliminary evidence that bright light may help to lose weight in obese people (Thor Helge Bergan, Norvay, 2002, unpublished). Subjects: aged 20-65 y, BMI > 30, non-seasonal (SPAQ score <8, no seasonal problem), in good general health, with regular sleep from 22:00-1:00 to 6:00-9:00. Study season: November-April. Placebo-controlled, single-blind, crossover. At least 1 mo between two arms; at similar phase of menstrual cycle (if present). If could not complete at the first year, the second arm is to be done the next winter. Intervention: Lightbox (4300 lux) - during one arm, deactivated ioniser - during another arm (sequential alternation upon entering the study) for 3 weeks each morning (at least 18 days) starting between 6:00-9:00. Seating distance (from the face to the device) is 41 cm, duration - 30 min. Diet: a target amount of kcal per day is calculated based on age, weight and gender (WHO), e.g. for a woman 40 y ang 80 kg it is 1502 kcal per day. Food content - is also as recommended by WHO. Food distribution over day - usual for the particular test subject but constant over sessions. Food diary is completed daily and subjects calculate kcal themselves based on a Table of kcal. Outcomes: Weight is measured during a visit to doctor a day before and day after the 3-week session, and also at home every week. Motivation and Expectation are rated by 3-point scales in a Diary, at the beginning of each session. Mood, activity and appetite are self-estimated using a VAS-like 10-points scale every week. At the end of each arm the "Easiness of dieting" scale and Adverse event(s) are completed. In the diary, there are also columns for sleep on and off times, intervention time, duration and distance, number of kcal. A target number of subjects to complete the study is 40.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 41 participants
Allocation: Non-Randomized
Intervention Model: Crossover Assignment
Masking: Single (Investigator)
Primary Purpose: Treatment
Study Start Date : December 2006
Actual Primary Completion Date : April 2007
Actual Study Completion Date : April 2007

Primary Outcome Measures :
  1. weight, kg [ Time Frame: 4 months ]

Information from the National Library of Medicine

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Ages Eligible for Study:   20 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • age 20-65 y
  • BMI > 30
  • non-seasonal (SPAQ score <8, no seasonal problem)
  • good general health; if there is a serious chronic disease - then compensated, with a constant dose of medication(s)
  • regular sleep from 22:00-1:00 to 6:00-9:00
  • a wish to participate and complete the study

Exclusion Criteria:

  • any acute disease during the past month
  • transmeridian travel >3 time zones over the past month
  • a use of medication(s) which influence body weight - during the last 2 months

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00406770

Sponsors and Collaborators
Russian Academy of Medical Sciences
Principal Investigator: Konstantin V. Danilenko, MD Institute of Internal Medicine SB RAMS

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Outside In Identifier: NCT00406770     History of Changes
Other Study ID Numbers: We-Light
First Posted: December 4, 2006    Key Record Dates
Last Update Posted: October 19, 2009
Last Verified: October 2009

Keywords provided by Russian Academy of Medical Sciences:
Light therapy
Hypocaloric diet