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Morphology of extensor digitorum longus of Wistar rats after remobilization by vibratory platform

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Izabela Rodrigues Camilo I. R., Maria Luiza Serradourada Wutzke M. L. S., Rose Meire Costa R. M., Gladson Ricardo Flor Bertolini G. R. F., Lucinéia de Fátima Chasko Ribeiro L.
European Journal of Clinical and Experimental Medicine
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2019
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issue 4
295-300
EN
Introduction. In exercise, vibrations are performed in order to produce rapid and short changes in muscle length. These changes are detected by sensory receptors, in response try to dampen the vibratory waves through a modulation of muscle stiffness. However, its effects on the morphology of muscle tissue are still not fully established, especially after long periods of immobilization. Aim. To compare the effects of the vibratory platform on the remobilization of the extensor digitorum longus (EDL) muscle of Wistar rats with free remobilization. Material and methods. 20 rats were divided into: CG (Control), IG (immobilized), IFG (immobilization and free remobilization), IPG (immobilization and remobilization with vibratory platform). The immobilization was performed on the pelvic limb for 15 days. The remobilization with vibratory platform was done for 10 minutes daily, for 2 weeks. The EDL was processed for histological analysis of cross-sections. Results. The area, larger diameter, smaller diameter and fiber density of the EDL muscle of GI presented significant alteration when opposed to CG, IFG and IPG. The density of nuclei of the EDL muscle of IG presented a significant increase when opposed to the others, and IPG also presented a significant increase when compared to CG. Conclusion. The morphology and morphometry of the EDL muscle tissue were affected, and both free and vibration platform remobilization re-established the morphological aspects of the muscle fiber, without significant differences between the methods.
2
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Histological aspects of whole-body vibration in the knee remobilization of Wistar rats

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da Costa J. R. G., Tavares A. L. d. F., Bertolini G. R. F., Wutzke M. L. S., Boaro C. D. T., Rodriguez D. F. S., Costa R. M., Ribeiro L. d. F. C.
European Journal of Clinical and Experimental Medicine
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2022
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issue 2
159-166
EN
Introduction and aim. The knee is one of the joints where immobilization is most used, however, it can cause morphological changes in the joint tissues and is a challenge to be overcome during rehabilitation. Whole-body vibration (WBV) is capable of generating repetitive oscillatory movements, which cause mechanical stimuli that interfere with tissue plasticity. The aim of this study was to analyze the knee morphology of Wistar rats submitted to remobilization with WBV. Material and methods. 32 male rats were used, divided into four groups (n=8): Control Group (G1), Immobilization Group (G2), Immobilized Group and Free Remobilization (G3), Remobilized Group with WBV (G4). For immobilization, a plastered apparatus was used for 15 days. G3 and G4 carried out free remobilization or with WBV, respectively, for 2 weeks. The knee joints were processed for light microscopy. Results. The WBV led to a reduction in the inflammatory infiltrate in the articular cavity and greater presence of adipocytes in the subintima of the synovial membrane. Conclusion. Remobilization with WBV induced a better tissue response in the synovial membrane when compared to free remobilization.
3
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Musculoskeletal symptoms and exposure to whole-body vibration among open-pit mine workers in the Arctic

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Burström L., Aminoff A., Björ B., Mänttäri S., Nilsson T., Pettersson H., Rintamäki H., Rödin I., Shilov V., Talykova L., Vaktskjold A., Wahlström J.
International Journal of Occupational Medicine and Environmental Health
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2017
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vol. 30
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issue 4
553-564
EN
Objectives This cross-sectional questionnaire study was carried out at 4 open-pit mines in Finland, Norway, Russia and Sweden as part of the MineHealth project. The aim has been to compare the prevalence of musculoskeletal symptoms between drivers of mining vehicles and non-drivers. Material and Methods The mine workers were asked whether they had suffered from any musculoskeletal symptoms during the previous 12 months in specified body regions, and to grade the severity of these symptoms during the past month. They were also asked about their daily driving of mining vehicles. Results The questionnaire was completed by 1323 workers (757 vehicle drivers) and the reported prevalence and severity of symptoms were highest for the lower back, followed by pain in the neck, shoulder and upper back. Drivers in the Nordic mines reported fewer symptoms than non-drivers, while for Russian mine workers the results were the opposite of that. The daily driving of mining vehicles had no significant association with the risk of symptoms. Female drivers indicated a higher prevalence of symptoms as compared to male drivers. Conclusions The study provided only weak support for the hypothesis that drivers of vehicles reported a higher prevalence of musculoskeletal symptoms than non-vehicle drivers. There were marked differences in the prevalence of symptoms among workers in various enterprises, even though the nature of the job tasks was similar. Int J Occup Med Environ Health 2017;30(4):553–564
4
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Heart disease attributed to occupational noise, vibration and other co-exposure: Self-reported population-based survey among Bulgarian workers

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Dzhambov A. M., Dimitrova D. D.
Medycyna Pracy
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2016
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vol. 67
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issue 4
435-445
PL
Wstęp Choroby układu sercowo-naczyniowego są główną przyczyną zgonów na świecie. Z kolei hałas i wibracje uznaje się za czynniki ryzyka zawodowego, ale niewiele wiadomo na temat ich wpływu na układ krążenia u mieszkańców Bułgarii z uwzględnieniem płci i różnych grup zawodowych. Celem pracy była ocena ryzyka występowania chorób układu krążenia związanego z zawodowym narażeniem na hałas i drgania. Materiał i metody Wykonano retrospektywną analizę danych z 3 etapów (lat 2001–2010) Europejskiego Badania Warunków Pracy (European Working Conditions Survey – EWCS). Analiza obejmowała wyniki badania ankietowego reprezentatywnej próby – 3149 bułgarskich pracowników w wieku ≥ 15 lat. Po wprowadzeniu poprawki na inne badane czynniki okazało się, że istnieje związek między zgłaszanymi w ankiecie przypadkami chorób serca a narażeniem na hałas i drgania w miejscu pracy. Wyniki 3 etapów badania połączono, dokonując metaanalizy z zastosowaniem metody ważenia przez odwrotność wariancji (inverse variance heterogeneity – IVhet). Wyniki W przypadku hałasu ryzyko występowania chorób układu krążenia było podwyższone u kobiet (ryzyko względne (relative risk – RR) = 1,26; 95-procentowy przedział ufności (95% confidence interval – 95% CI): 0,53–3,01, ale nie wśród mężczyzn (RR = 0,49; 95% CI: 0,14–1,65). U pracowników o długim stażu pracy ryzyko względne wynosiło 1,01 (95% CI: 0,60–1,69). W przypadku wibracji RR było zwiększone u wszystkich badanych, ale bardziej u mężczyzn (RR = 2,56; 95% CI: 1,60–4,09) niż u kobiet (RR = 1,32; 95% CI: 0,77–2,27). Wśród pracowników o długim stażu pracy ryzyko względne wynosiło 1,56 (95% CI: 1,02–2,40), u zatrudnionych w przemyśle – 1,10 (95% CI: 0,61–1,98), a u pracujących w sektorze usług – 1,18 (95% CI: 0,57–2,46). Wnioski Narażenie na drgania w miejscu pracy w Bułgarii było czynnikiem zwiększonego ryzyka chorób serca. Natomiast narażenie na hałas prawdopodobnie było tym czynnikiem tylko wśród kobiet i robotników o długim stażu pracy. Med. Pr. 2016;67(4):435–445
EN
Background Cardiovascular disease (CVD) is the main mortality cause worldwide. Noise and vibration are considered to be occupational risk factors, but little is known about their cardiovascular effects in Bulgaria in terms of gender and various professional groups. The aim of this study has been to investigate the risk of prevalent CVD, associated with occupational noise and vibration exposure. Material and Methods We conducted a secondary analysis of the data from 3 waves of the European Working Conditions Survey (EWCS) 2001–2010 – a nationally-representative cross-sectional questionnaire survey covering 3149 workers aged ≥ 15 years in Bulgaria. Data on self-reported heart disease were linked to self-reported occupational noise and vibration, adjusting for other factors. Results from the 3 waves were pooled together using the inverse variance heterogeneity (IVhet) meta-analysis. Results For noise, the risk was elevated among women (relative risk (RR) = 1.26, 95% confidence interval (CI): 0.53–3.01), but not men (RR = 0.49, 95% CI: 0.14–1.65). Long-term workers had RR = 1.01, 95% CI: 0.60–1.69. For vibration, the risk was increased in all participants. It was higher among men (RR = 2.56, 95% CI: 1.60–4.09) than it was among women (RR = 1.32, 95% CI: 0.77–2.27). Among long-term, industrial, and service workers it was RR = 1.56, 95% CI: 1.02–2.40; RR = 1.10, 95% CI: 0.61–1.98, and RR = 1.18, 95% CI: 0.57–2.46, respectively. Conclusions Occupational vibration was a risk factor for prevalent heart disease in Bulgaria. Noise was an alleged risk factor only among long-term workers and women. Med Pr 2016;67(4):435–445
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