Stimulatory effect of morning bright light on reproductive hormones and ovulation: results of a controlled crossover trial.

ABSTRACT:

Objectives

Studies have shown a shortening of the menstrual cycle following light exposure in women with abnormally long menstrual cycles or with winter depression, suggesting that artificial light can influence reproductive hormones and ovulation. The study was designed to investigate this possibility.

Design

Placebo-controlled, crossover, counterbalanced order.

Setting

Medical centres and participants' homes in Novosibirsk (55 degrees N), Russia.

Participants

Twenty-two women, aged 19-37 years, with baseline menstrual cycle length 28.1-37.8 d and no clinically evident endocrine abnormalities completed the study. The study lasted for two menstrual cycles separated by at least one off-protocol cycle.

Interventions

During one experimental cycle, bright li

SUBMITTER: Danilenko KV 

PROVIDER: S-EPMC1851732 | biostudies-literature | 2007 Feb

REPOSITORIES: biostudies-literature