TY - JOUR
T1 - Is Sedentary Lifestyle Associated With Testicular Function?
T2 - A Cross-Sectional Study of 1,210 Men
AU - Priskorn, Lærke
AU - Jensen, Tina Kold
AU - Bang, Anne Kirstine
AU - Nordkap, Loa
AU - Joensen, Ulla Nordström
AU - Lassen, Tina Harmer
AU - Olesen, Inge Ahlmann
AU - Swan, Shanna H
AU - Skakkebaek, Niels E
AU - Jørgensen, Niels
N1 - © The Author 2016. Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: [email protected].
PY - 2016/8/15
Y1 - 2016/8/15
N2 - Based on cross-sectional data on 1,210 healthy young Danish men, we investigated whether sedentary lifestyle was associated with testicular function (semen quality and reproductive hormones) independent of physical activity. The men were invited to participate in the study between 2008 and 2012, when they attended a compulsory medical examination to determine their fitness for military service. Information on sedentary behavior (television watching and computer time) and physical activity was obtained by questionnaire. The men had a physical examination, delivered a semen sample, and had a blood sample drawn. Time spent watching television, but not time sitting in front of a computer, was associated with lower sperm counts. Men who watched television more than 5 hours/day had an adjusted sperm concentration of 37 million/mL (95% confidence interval (CI): 30, 44) versus 52 million/mL (95% CI: 43, 62) among men who did not watch television; total sperm counts in those 2 groups were 104 million (95% CI: 84, 126) and 158 million (95% CI: 130, 189), respectively. Furthermore, an increase in follicle-stimulating hormone and decreases in testosterone and the testosterone/luteinizing hormone ratio were detected in men watching many hours of television. Self-rated physical fitness, but not time spent on physical activity, was positively associated with sperm counts.
AB - Based on cross-sectional data on 1,210 healthy young Danish men, we investigated whether sedentary lifestyle was associated with testicular function (semen quality and reproductive hormones) independent of physical activity. The men were invited to participate in the study between 2008 and 2012, when they attended a compulsory medical examination to determine their fitness for military service. Information on sedentary behavior (television watching and computer time) and physical activity was obtained by questionnaire. The men had a physical examination, delivered a semen sample, and had a blood sample drawn. Time spent watching television, but not time sitting in front of a computer, was associated with lower sperm counts. Men who watched television more than 5 hours/day had an adjusted sperm concentration of 37 million/mL (95% confidence interval (CI): 30, 44) versus 52 million/mL (95% CI: 43, 62) among men who did not watch television; total sperm counts in those 2 groups were 104 million (95% CI: 84, 126) and 158 million (95% CI: 130, 189), respectively. Furthermore, an increase in follicle-stimulating hormone and decreases in testosterone and the testosterone/luteinizing hormone ratio were detected in men watching many hours of television. Self-rated physical fitness, but not time spent on physical activity, was positively associated with sperm counts.
U2 - 10.1093/aje/kwv338
DO - 10.1093/aje/kwv338
M3 - Journal article
C2 - 27501721
SN - 0002-9262
VL - 184
SP - 284
EP - 294
JO - American Journal of Epidemiology
JF - American Journal of Epidemiology
IS - 4
ER -