Aerobic Fitness and Neurocognitive Function Scores in Young Faroese Adults and Potential Modification by Prenatal Methylmercury Exposure.
Exposure to methylmercury was shown to decrease neural stem cell populations, whereas aerobic fitness has beneficial effects on the adult brain that relies on improved neurogenesis in the hippocampus.



We examined the association between aerobic fitness and neurocognitive outcomes at young adult age, along with the potential moderating effect of prenatal exposure to methylmercury.



At age 22 years, 262 members of a Faroese birth cohort, established in 1986-1987, underwent a graded exercise test of aerobic fitness to measure maximal oxygen uptake (VO2Max). Their prenatal methylmercury exposure had been assessed from the mercury concentration in cord blood. We estimated cross-sectional associations between VO2Maxand multiple measures of neurocognitive function. In addition, we compared groups with low and high prenatal methylmercury exposure.



A 1 standard deviation (SD) increase in VO2Maxwas associated with better scores on short-term memory and cognitive processing speed by 0.21 SD (95% CI: -0.04, 0.46) and 0.28 SD (95% CI: 0.02, 0.54), respectively. In the group with lower prenatal methylmercury exposure, a 1 SD increase in VO2Maxwas associated with increased scores on cognitive processing speed by 0.45 SD (95% CI: 0.08, 0.81) and with a slightly lesser benefit in short-term memory. No such association was observed in the group with high prenatal methylmercury exposure.



Higher aerobic capacity was associated with better performance in short-term memory and processing speed. However, prenatal methylmercury exposure seemed to attenuate these positive associations.
Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.
Youssef
Y
Oulhote
Frodi
F
Debes
Sonja
S
Vestergaard
Pal
P
Weihe
Philippe
P
Grandjean
D001944:Breath Tests; D003430:Cross-Sectional Studies; D003718:Denmark / Q000453:epidemiology; D004781:Environmental Exposure / Q000706:statistics & numerical data*; D004785:Environmental Pollutants / Q000097:blood*; D005260:Female; D005312:Fetal Blood; D006801:Humans; D008297:Male; D008767:Methylmercury Compounds / Q000097:blood*; D009483:Neuropsychological Tests; D017747:Seafood; D055815:Young Adult
D004785:Environmental Pollutants; D008767:Methylmercury Compounds