Plasma concentrations of thyroxine in dairy cows exposed to 60 Hz electric and magnetic fields

Burchard, J.F.; Nguyen, Duc Hai; Rodríguez, María I.

doi:10.1002/bem.20253

Cited by 9 publications

(4 citation statements)

References 42 publications

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“…27 Based on the results obtained in this study, exposure of dairy cattle to 10 kV/m 30 µT EMF altered the blood thyroxin level. Although this study has some similarities with the current investigation, TSH level that is a much more sensitive criterion than T4 for assessment of thyroid function was not evaluated.…”

Section: T3(ng/ml) T4(microg/dl) Tsh(miu/l)mentioning

confidence: 68%

Alterations in TSH and Thyroid Hormones following Mobile Phone Use

Mortavazi¹,

Habib²,

Ganj-Karami³

et al. 2009

OMJ

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As far as the study is concerned, this is the first human study to assess the associations between mobile phone use and alterations in the levels of TSH and thyroid hormones. Based on the findings, a higher than normal TSH level, low mean T4 and normal T3 concentrations in mobile users were observed. It seems that minor degrees of thyroid dysfunction with a compensatory rise in TSH may occur following excessive use of mobile phones. It may be concluded that possible deleterious effects of mobile microwaves on hypothalamic-pituitary-thyroid axis affects the levels of these hormones.

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Section: T3(ng/ml) T4(microg/dl) Tsh(miu/l)mentioning

confidence: 68%

Alterations in TSH and Thyroid Hormones following Mobile Phone Use

Mortavazi¹,

Habib²,

Ganj-Karami³

et al. 2009

OMJ

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“…These EMFs have also been associated with changes in the concentrations of macro and trace elements in blood plasma [Burchard et al, 1999] and neurotransmitter metabolites in cerebrospinal fluid [Burchard et al, 1998c] and slight variations in plasma thyroxine [Burchard et al, 2006] in dairy cattle. Lactating pregnant dairy cows exposed to EMF (60 Hz, 10 kV/m, and 30 mT) had increased blood prolactin (PRL) and decreased diurnal melatonin (MLT) concentrations [Rodriguez et al, 2004].…”

Section: Introductionmentioning

confidence: 99%

Exposure of pregnant dairy heifer to magnetic fields at 60 Hz and 30 µT

Burchard

Nguyen

Monardes

2007

Bioelectromagnetics

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Thirty-two pregnant Holstein heifers weighing 499 +/- 45 kg, at 3.1 +/- .7 months of gestation and 21 +/- 2.0 months of age were confined and exposed to 30 microT magnetic fields (MFs) and a 12 h light/12 h dark light cycle. The heifers were divided into two replicates of 16 animals. Each replicate was divided into two groups of eight animals each, one group the non-exposed and the second, the exposed group. The animals were subjected to the different treatments for 4 weeks. After 4 weeks, the animals switched treatment, the exposed group becoming the non-exposed group and vice versa. Then the treatment continued for 4 more weeks. Catheters were inserted into the jugular vein, and blood samples were collected twice a week to estimate the concentration of progesterone (P4), melatonin (MLT), prolactin (PRL), and insulin-like growth factor 1 (IGF-1). Feed consumption was measured daily. The results indicated that exposure of pregnant heifers to MF similar to those encountered underneath a 735 kV high tension electrical power line for 20 h/day during a period of 4 weeks produces slight effects. This is evidenced by statistically significant higher body weight (1.2%), higher weekly body weight gain (30%), and decreases in the concentration of PRL (15%) and IGF-1 (4%) in blood serum. The absence of abnormal clinical signs and the absolute magnitude of the significant changes detected during MF exposure, make it plausible to preclude any major animal health hazard.

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“…Regarding the mechanism of body-mass gain, it is interesting that mild increases in plasma thyroid hormones (e.g., thyroxine) [20] and prolactin [21] have been found in pregnant lactating dairy cows that were exposed to a power-frequency magnetic field. Thyroxine is known to play key roles in growth, metabolism, reproduction, and somatic differentiation in developing and adult animals [22].…”

Section: Discussionmentioning

confidence: 99%

Effects of Power-Frequency Magnetic Fields on Body Mass in Rats: A Pooled Analysis

Nishimura

Tada²,

Teramukai³

et al. 2012

PIER Letters

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Abstract-There is some evidence that exposure of various animals to a power-frequency magnetic field can cause increases in body mass. However, the precise nature of the relationship is not clear, particularly for long-term exposure. To clarify the relationship between long-term power-frequency magnetic field exposure (2 years) and animal body mass, we conducted a pooled analysis of data in two studies to examine the impact of power-frequency magnetic field exposure on body mass as compared with sham-exposed rats of both sexes. Relative body mass was the response variable, and the study duration (in weeks), magnetic flux density (µT), and daily exposure time (hours/day) were the explanatory variables with adjustment for the study. We analyzed by sex. The P -value (P ) was defined as the probability of having observed our data (or more extreme data) when the null hypothesis was true. In multiple linear regression analyses of male and female rats, performed separately, we obtained estimates of the effect on relative body mass of study duration (coefficients 0.0225 and 0.0201, respectively; both P < 0.0001), magnetic flux density (coefficient 0.0002 for males, P < 0.0001; coefficient −0.0002 for females, P = 0.0015), and daily exposure time (coefficient 0.046 for

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Plasma concentrations of thyroxine in dairy cows exposed to 60 Hz electric and magnetic fields

Cited by 9 publications

References 42 publications

Alterations in TSH and Thyroid Hormones following Mobile Phone Use

Alterations in TSH and Thyroid Hormones following Mobile Phone Use

Exposure of pregnant dairy heifer to magnetic fields at 60 Hz and 30 µT

Effects of Power-Frequency Magnetic Fields on Body Mass in Rats: A Pooled Analysis

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