期刊
AMERICAN JOURNAL OF EPIDEMIOLOGY
卷 171, 期 8, 页码 883-891出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/aje/kwq007
关键词
caffeine; cola, fertility; reproductive medicine; semen analysis
资金
- European Union [QLK4-1999-01422/BMH4-CT96-0314]
- Danish Environmental Agency
- Danish Research Council [2107-04-0006, 22-03-0198, 95-103-21990]
- Malermester Johansens Fond and Svend Andersens Fond
- Danish Agency for Science, Technology and Innovation [271070678]
The authors examined the association between semen quality and caffeine intake among 2,554 young Danish men recruited when they were examined to determine their fitness for military service in 2001-2005 The men delivered a semen sample and answered a questionnaire including information about caffeine intake from various sources, from which total caffeine intake was calculated Moderate caffeine and cola intakes (101-800 mg/day and <= 14 0 5-L bottles of cola/week) compared with low intake (<= 100 mg/day, no cola intake) were not associated with semen quality High cola (>14 0.5-L bottles/week) and/or caffeine (>800 mg/day) intake was associated with reduced sperm concentration and total sperm count, although only significant for cola High-intake cola drinkers had an adjusted sperm concentration and total sperm count of 40 mill/mL (95% confidence interval (CI). 32, 51) and 121 mill (95% CI 92, 160), respectively, compared with 56 mill/mL (95% CI. 50, 64) and 181 mill (95% CI. 156, 210) in non-cola-drinkers, which could not be attributed to the caffeine they consumed because it was <140 mg/day. Therefore, the authors cannot exclude the possibility of a threshold above which cola, and possibly caffeine, negatively affects semen quality. Alternatively, the less healthy lifestyle of these men may explain these findings
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