Inverse U-shaped Association between Sleep Duration and Semen Quality: Longitudinal Observational Study (MARHCS) in Chongqing, China.

ABSTRACT:

Study objectives

To investigate the association between sleep duration and semen parameters as well as reproductive hormone levels.

Methods

We designed a cohort of male college students in Chongqing, China. A total of 796 subjects were recruited in 2013 and 656 (82.4%) were followed up in 2014. Each time, semen and peripheral blood samples were collected for semen quality and reproductive hormone measurement. Sleep duration was estimated by revised Munich Chronotype Questionnaire. In 2014, sleep quality was also measured by Pittsburgh Sleep Quality Index (PSQI).

Results

There was a substantial inverse U-shaped association between sleep duration and two semen parameters (semen volume and total sperm number), with 7.0-7.5 h/day of sleep showing highest parameters. Eithe

SUBMITTER: Chen Q 

PROVIDER: S-EPMC4678345 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature