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Heart rate variability (HRV) analysis in radio and TV broadcasting stations workers

100%

Bortkiewicz A. , Gadzicka E. , Szymczak W. , Zmyślony M.

International Journal of Occupational Medicine and Environmental Health

2012

tom 25

nr 4

446-455

Objectives: The aim of the study was to assess the mechanism of cardiovascular impairments in workers exposed to UHF-VHF radio frequency electromagnetic fi elds (EMF). Materials and Methods: Heart rate variability (HRV) was analysed using 512 normal heart beats registered at rest. The analysis concerned time-domain (STD R-R) and frequencydomain (VLF, LF, HF) parameters of HRV. Fifty nine workers (group I) with low-level and 12 workers (group II) with highlevel exposure were examined. The mean age of the subjects was 47±9 years and 41±14 years, and mean exposure duration 19.1±8.8 years and 13±4 years, in groups I and II, respectively. The groups were divided according to: $\text{E}_\text{max}$, $\text{E}_\text{dose}$, $\text{E}_\text{mean}$ for frequencies UHF, VHF and UHF+VHF: The control group consisted of 42 non-exposed subjects, aged 49±8 years. Statistical analysis comprised one-way analysis of variance, covariance analysis and logistic regression models. Results: In the exposed groups, the heart rate was higher than in the control one. Standard deviation of R-R intervals (STD R-R) was found to be signifi cantly (p = 0.0285) lower in group I (42.5±24.7 ms) compared to the control group (62.9±53.5 ms). The risk of lowered STD R-R was signifi cantly increased (OR = 2.37, p = 0.023) in group II. Both exposed groups presented signifi cantly higher VLF and LF values than the control group (p = 0.005 and p = 0.0025, respectively). The EMF-exposed groups were characterised by the dominance of the sympathetic system (LF/HF 1.3±0.35). Conclusions: The results indicate that exposure to radiofrequency EMF may affect the neurovegetative regulation.

ОСОБЛИВОСТІ МОРФОФУНКЦІОНАЛЬНОГО СТАТУСУ ТА ФІЗИЧНОЇ ПІДГОТОВЛЕНОСТІ ЮНИХ СПОРТСМЕНІВ РІЗНИХ СОМАТОТИПІВ

75%

Скиба О. , Дмитрук С.

Педагогічні науки: теорія, історія, інноваційні технології

2016

nr 3(57)

276-284

Morphofunctional status of children is a prognostic factor sports fitness, since it characterizes an individual development of the body and overall health. The aim is to determine the morphofunctional characteristics of children, who are engaged in cyclic kind of sports and to assess their impact on the indicators of success of the sports activity. The study methods are anthropometric, functional, mathematical and statistical methods. The result is an assessment of morphofunctional indicators of children, who are engaged in cyclic kind of sports depending on their somatotype. Among the surveyed contingent the advantage of mezosomal somatotype (55.56±4.99%) is observed. The percentage of children with microsomal type in the general structure of somatotypes is amounted 25.25±4.37%, respectively to 19.19±3.96% of children was classified as macrosomal type. Among the most representatives of microsomal somatotype (69.23±4.64%) a low level of development of strength abilities and the average level of physical performance (52.0±5.02%) is identified. The high level of physical performance was peculiar only for representatives of mezosomal somatotype (3.64±1.88%), also was observed among them the largest number of children with a satisfactory adaptation (10.53±3.09%). The least favorable in terms vegetative regulation there were children with macrosomal somatotype. Among certain groups of children in 44.27±4.99% sympathicotonia was noted, in 38.43±4.89% - vagotonia, which indicates the stress mechanisms of autonomic regulation of the heart rhythm. It was found that among those nine years, the growth of the indicators of special physical fitness was 0.25±0.10 (p <0.05), whereas among children of eight and ten years, the changes in the development of endurance were somewhat smaller (0.15±0.41 c and to -0.20±0,09 c, respectively). Somatotypological characteristics of the young athletes have the greatest impact on growth velocity (19.97%; F=11.36; p<0.001) and endurance (16.72%; F=9.13, p<0.001). The contribution of the somatotype performance in speed-strength abilities and strength is smaller and amounts to 8.56; F=4.26, p<0.01 and 4.94%; F=2.36, p<0.01, respectively.