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Comparison of Hydrolytic Resistance of Polyurethanes and Poly(Urethanemethacrylate) Copolymers in Terms of their Use as Polymer Coatings in Contact with the Physiological Liquid

100%
Król P., Chmielarz P., Król B., Pielichowska K.
Polish Journal of Chemical Technology
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2014
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vol. 16
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issue 2
16-26
EN
PU elastomers were synthesized using MDI, PTMO, butane-1,4-diol or 2,2,3,3-tetrafiuorobutane-1,4-diol. Using the same diisocyanate and polyether reagents urethane segments were prepared, to be inserted in the poly(urethane-methacrylate) copolymers. Bromourethane or tetraphenylethane-urethane macroinitiators were used as transitional products reacting with MMA according to the ARGET ATRP. 1H and 13C NMR spectral methods, as well as DSC and TGA thermal methods, were employed to confirm chemical structures of synthesised elastomers and copolymers. To investigate the possibility of using synthesized polymers as biomaterials a research on keeping them in physiological liquid at 37°C was performed. A loss in weight and ability to sorption of water was determined and by using GPC the molecular weight changes were compared. Additionally, changes in the thermal properties of the samples after exposure in physiological liquid were documented using both the TGA and DSC methods. The studies of surface properties (confocal microscopy and SFE) of the obtained polymers were performed. The structure of the polymer chains was defined by NMR. Possible reasons of hydrolysis were discussed, stating that new copolymers are more resistant and polar biomaterials can be less interesting than elastomers.
2
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The Effect of a Single Session of Whole-Body Vibration Training in Recreationally Active Men on the Excitability of the Central and Peripheral Nervous System

76%
Chmielewska D., Piecha M., Blaszczak E., Król P., Smykla A., Juras G.
Journal of Human Kinetics
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2014
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vol. 41
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issue 1
89-98
EN
Vibration training has become a popular method used in professional sports and recreation. In this study, we examined the effect of whole-body vibration training on the central nervous system and muscle excitability in a group of 28 active men. Subjects were assigned randomly to one of two experimental groups with different variables of vibrations. The chronaximetry method was used to evaluate the effect of a single session of whole-body vibration training on the excitability of the rectus femoris and brachioradialis muscles. The examination of the fusing and flickering frequencies of the light stimulus was performed. An increase in the excitability of the quadriceps femoris muscle due to low intensity vibrations (20 Hz frequency, 2 mm amplitude) was noted, and a return to the initial values was observed 30 min after the application of vibration. High intensity vibrations (60 Hz frequency, 4 mm amplitude) caused elongations of the chronaxy time; however, these differences were not statistically significant. Neither a low intensity vibration amplitude of 2 mm (frequency of 20 Hz) nor a high intensity vibration amplitude of 4 mm (frequency of 60 Hz) caused a change in the excitability of the central nervous system, as revealed by the average frequency of the fusing and flickering of the light stimulus. A single session of high intensity whole-body vibration did not significantly decrease the excitability of the peripheral nervous system while the central nervous system did not seem to be affected.
3
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Radial shockwave and ultrasound in the treatment of lateral epicondylitis – a preliminary report

64%
Białek L., Franek A., Błaszczak E., Król T., Dolibog P., Białek J., Dolibog P., Wróbel B., Król P.
Medical Rehabilitation
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2018
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vol. 22(1)
15-21
PL
Wstęp: Leczenie entezopatii nadkłykcia bocznego kości ramiennej bywa trudne. W terapii tego schorzenia wykorzystuje się przede wszystkim metody zachowawcze. Wśród stosowanych czynników fizykalnych zastosowanie znajdują między innymi radialna fala uderzeniowa i ultradźwięki. Wyniki badań, w których w leczeniu entezopatii nadkłykcia bocznego stosowano wspomniane bodźce wskazują na dobrą skuteczność omawianych zabiegów choć nie są jednoznaczne. Ponadto do tej pory nie ustalono optymalnych parametrów aplikacyjnych tych zabiegów. Celem pracy jest analiza skuteczności terapii za pomocą radialnej fali uderzeniowej i ultradźwięków w leczeniu entezopatii nadkłykcia bocznego kości ramiennej oraz porównanie efektywności terapeutycznej tych zabiegów we wspomnianej jednostce chorobowej. Materiał i metody: Do badań zakwalifikowano 26 pacjentów z entezopatią nadkłykcia bocznego kości ramiennej, których podzielono na dwie grupy porównawcze (A i B). Do grupy A i do grupy B zakwalifikowano po 13 pacjentów. W grupie A podczas terapii stosowano radialną falę uderzeniową, w grupie B natomiast ultradźwięki. W obu grupach analizowano zmiany wielkości bólu spoczynkowego, bólu nocnego oraz bólu występującego podczas aktywności, zmiany siły ścisku ręki, a także oceniano skuteczność terapii. Wyniki: W całym okresie obserwacji w obu grupach obserwowano redukcję wszystkich rodzajów analizowanego bólu. Ponadto, w obu grupach dochodziło również do stopniowego wzrostu siły chwytu chorej kończyny. Zmiany procentowe wszystkich analizowanych parametrów były zbliżone w obu porównywanych grupach. Rozkład wyników subiektywnej oceny efektów terapii w grupach A i B jest porównywalny. Wnioski: Zarówno radialna fala uderzeniowa, jak i ultradźwięki są skutecznymi metodami leczenia entezopatii nadkłykcia bocznego kości ramiennej, dając przede wszystkim dobry efekt przeciwbólowy oraz poprawę siły chwytu objętej patologią kończyny. Skuteczność obu metod fizykalnych w przypadku entezopatii nadkłykcia bocznego kości ramiennej jest porównywalna.
EN
Introduction: Lateral epicondylitis can be resistant to treatment that usually involves the use of conservative therapies, including physical modalities such as radial shockwave and ultrasound. Studies show that both modalities are efficacious but their results are inconsistent. The optimal parameters for applying them are also yet to be determined. This trial was designed to analyse and compare the efficacy of radial shock wave and ultrasound as therapies for treating patients with lateral epicondylitis. Material and methods: The trial was conducted with 26 patients with lateral epicondylitis divided into two comparative groups (A and B), each consisting of 13 patients. The groups were treated with radial shockwave and ultrasound, respectively. In both of them, changes in patients’ rest pain, night pain, pain during activity, and hand grip strength were evaluated, as well as the efficacy of both therapies. Results: The intensity of all types of pain decreased over the course of the study in both groups and patients’ grip strength gradually improved. The groups were comparable in terms of percentage change in the analysed parameters and the distribution of patients’ self-assessments of treatment efficacy. Conclusions: Radial shockwave and ultrasound show comparable efficacy in treating lateral epicondylitis. They are particularly effective in reducing pain intensity and increasing the hand grip strength of the affected extremity.
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