Rivka Ty | Crimean State Medical University (original) (raw)
Papers by Rivka Ty
science.crimea.edunwww.science. …
Studies conducted among adults professionally exposed to heavy metals suggest a negative impact o... more Studies conducted among adults professionally exposed to heavy metals suggest a negative impact of Pb and Cd on heart rate variability (HRV) while the results among children regarding background exposure are less consistent. Measurement of Pb and Cd in hair was performed in 56 children (12-13 year old) using X-ray spectrophotometry. HRV was assessed using 5-min recordings through a standardized protocol. Multiple linear regressions were performed. Median hair lead and cadmium levels were 2,59 µg/g (interquartile range (IQR): 1,06-5,25) and 0,02 µg/g (IQR: 0,0005-0,11), respectively. Child hair Pb and Cd were associated with high frequency (HF) (b = -0.26 and b = -0.33, p < 0.05), while Cd with low frequency (LF) (b = -0.36, p = 0.006). Results of the present study suggest that lead and cadmium exposure during childhood influence HRV.
Успехи современного естествознания, Jan 1, 2011
Антропогенные факторы, среди которых тяжелые металлы занимают ведущее место, оказывают негативное... more Антропогенные факторы, среди которых тяжелые металлы занимают ведущее место, оказывают негативное влияние как на организм в целом, так и на состояние вегетативной нервной системы (ВНС) в частности, как одной из систем регуляции, ...
Neurophysiology, Jan 1, 2006
In 18-to 19-year-old students, the content of a number of microelements, as well as of calcium, i... more In 18-to 19-year-old students, the content of a number of microelements, as well as of calcium, in biologically stable tissues (hair samples) was measured using X-ray fluorescent analysis. In the tested persons, we observed a certain deficit of main elements (calcium, copper, and zinc), while in some persons the levels of toxic lead and strontium were exceeded. Correlation analysis of the parameters of EEG potentials (current EEG and evoked and event-related potentials, EPs and ERPs, respectively) showed the existence of a few significant (or close to those) correlations of the spectral powers of some rhythms and derivatives of a few indices of the background EEG and more numerous cases of correlations of the parameters of EPs and ERPs (latencies and amplitudes) with the contents of the studied elements. The physiological importance of metals, according to the number of characteristics of EEG potentials that correlate with their contents, can be arranged in descending order as follows: As, Zn > Ca > Cd > Pb > Sr. None of the studied parameters of EEG phenomena correlated with the level of copper. The strength of correlations varied from weak to mild (0.29 < R < 0.50). The densest correlations were observed for the concentrations of toxic lead and cadmium. With respect to the characteristics of ERPs, some of the elements under study demonstrated synergism (e.g., lead and arsenic), while others were in an antagonistic relation (cadmium and calcium).
science.crimea.edunwww.science. …
Studies conducted among adults professionally exposed to heavy metals suggest a negative impact o... more Studies conducted among adults professionally exposed to heavy metals suggest a negative impact of Pb and Cd on heart rate variability (HRV) while the results among children regarding background exposure are less consistent. Measurement of Pb and Cd in hair was performed in 56 children (12-13 year old) using X-ray spectrophotometry. HRV was assessed using 5-min recordings through a standardized protocol. Multiple linear regressions were performed. Median hair lead and cadmium levels were 2,59 µg/g (interquartile range (IQR): 1,06-5,25) and 0,02 µg/g (IQR: 0,0005-0,11), respectively. Child hair Pb and Cd were associated with high frequency (HF) (b = -0.26 and b = -0.33, p < 0.05), while Cd with low frequency (LF) (b = -0.36, p = 0.006). Results of the present study suggest that lead and cadmium exposure during childhood influence HRV.
Успехи современного естествознания, Jan 1, 2011
Антропогенные факторы, среди которых тяжелые металлы занимают ведущее место, оказывают негативное... more Антропогенные факторы, среди которых тяжелые металлы занимают ведущее место, оказывают негативное влияние как на организм в целом, так и на состояние вегетативной нервной системы (ВНС) в частности, как одной из систем регуляции, ...
Neurophysiology, Jan 1, 2006
In 18-to 19-year-old students, the content of a number of microelements, as well as of calcium, i... more In 18-to 19-year-old students, the content of a number of microelements, as well as of calcium, in biologically stable tissues (hair samples) was measured using X-ray fluorescent analysis. In the tested persons, we observed a certain deficit of main elements (calcium, copper, and zinc), while in some persons the levels of toxic lead and strontium were exceeded. Correlation analysis of the parameters of EEG potentials (current EEG and evoked and event-related potentials, EPs and ERPs, respectively) showed the existence of a few significant (or close to those) correlations of the spectral powers of some rhythms and derivatives of a few indices of the background EEG and more numerous cases of correlations of the parameters of EPs and ERPs (latencies and amplitudes) with the contents of the studied elements. The physiological importance of metals, according to the number of characteristics of EEG potentials that correlate with their contents, can be arranged in descending order as follows: As, Zn > Ca > Cd > Pb > Sr. None of the studied parameters of EEG phenomena correlated with the level of copper. The strength of correlations varied from weak to mild (0.29 < R < 0.50). The densest correlations were observed for the concentrations of toxic lead and cadmium. With respect to the characteristics of ERPs, some of the elements under study demonstrated synergism (e.g., lead and arsenic), while others were in an antagonistic relation (cadmium and calcium).