Reproductive function during summer and winter in Norwegian men living north and south of the Arctic circle.

Malm, GunillaLund University,Lunds universitet,Reproduktionsmedicin, Malmö,Forskargrupper vid Lunds universitet,Reproductive medicine, Malmö,Lund University Research Groups (author)

Seasonal, daylight-dependent variation in human spermatozoa counts, with lowest values during summer, has been suggested. To test this hypothesis, we performed a longitudinal study of semen quality and reproductive hormone levels in Norwegian men living north and south of the Arctic Circle. An ejaculate and a serum specimen were obtained both in summer and in winter from 92 volunteers in Tromsoe (69° north latitude) and 112 in Oslo (60° north latitude). Semen analyses were performed, and serum was assayed for FSH and inhibin B. The median spermatozoa concentration in Tromsoe after adjustment for abstinence period length was 49 × 106/ml in summer and 54 × 106/ml in winter. Corresponding values for Oslo were 59 × 106/ml and 54 × 106/ml. The seasonal differences in spermatozoa concentration were not statistically significant, nor were significant differences observed in median total spermatozoa count, semen volume, percentage progressive motile spermatozoa, or FSH. In Tromsoe, but not Oslo, inhibin B concentration was slightly, but significantly (P = 0.02) higher in winter than summer (229 ng/liter vs. 223 ng/liter).The length of the daylight period may have a slight impact on hormonal markers of spermatogenesis but does not cause substantial changes in spermatozoa numbers and motility.

Haugen, Trine B (author)
Henrichsen, Trine (author)
Bjørsvik, Cathrine (author)
Grotmol, Tom (author)
Saether, Thomas (author)
Malm, JohanLund University,Lunds universitet,Klinisk kemi, Malmö,Forskargrupper vid Lunds universitet,Clinical Chemistry, Malmö,Lund University Research Groups(Swepub:lu)klke-jma (author)
Figenschau, Yngve (author)
Hagmar, Lars (author)
Rylander, LarsLund University,Lunds universitet,Avdelningen för arbets- och miljömedicin,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Occupational and Environmental Medicine, Lund University,Department of Laboratory Medicine,Faculty of Medicine(Swepub:lu)ymed-lry (author)
Levine, Richard J (author)
Giwercman, AleksanderLund University,Lunds universitet,Reproduktionsmedicin, Malmö,Forskargrupper vid Lunds universitet,Reproductive medicine, Malmö,Lund University Research Groups(Swepub:lu)kir-agi (author)
Reproduktionsmedicin, MalmöForskargrupper vid Lunds universitet (creator_code:org_t)

In:Journal of Clinical Endocrinology and Metabolism: The Endocrine Society89:9, s. 4397-44021945-71970021-972X

By the author/editor: Malm, Gunilla; Haugen, Trine B; Henrichsen, Trin ...; Bjørsvik, Cathri ...; Grotmol, Tom; Saether, Thomas; show more...; Malm, Johan; Figenschau, Yngv ...; Hagmar, Lars; Rylander, Lars; Levine, Richard ...; Giwercman, Aleks ...; show less...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Obstetrics Gynae ...

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Health Sciences; and Occupational Hea ...

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Basic Medicine; and Medicinal Chemis ...

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