- MeSH
- Academies and Institutes history organization & administration utilization MeSH
- Nuclear Reactors history utilization MeSH
- Safety history standards legislation & jurisprudence MeSH
- Power Plants instrumentation statistics & numerical data utilization MeSH
- Nuclear Energy legislation & jurisprudence MeSH
- Humans MeSH
- Education, Professional, Retraining methods standards MeSH
- Legislation as Topic standards MeSH
- Check Tag
- Humans MeSH
- Geographicals
- Slovakia MeSH
The aims of this study were to create a regression model of the relationship between load and muscle power output and to determine an optimal load for maximum power output during a countermovement squat and a bench press. 55 males and 48 females performed power testing at 0, 10, 30, 50, 70, 90, and 100% of their individual one-repetition maximum (1-RM) in the countermovement squat and bench press exercises. Values for the maximum dynamic strength and load for each lift were used to develop a regression model in which the ratio of power was predicted from the ratio of the load for each type of lift. By optimizing the regression model, we predicted the optimal load for maximum muscle power. For the bench press and the countermovement squat, the mean optimal loads for maximum muscle output ranged from 50 to 70% of maximum dynamic strength. Optimal load in the acceleration phase of the upward movement of the two exercises appeared to be more important than over the full range of the movement. This model allows for specific determination of the optimal load for a pre-determined power output.
- MeSH
- Models, Biological MeSH
- Adult MeSH
- Physical Endurance physiology MeSH
- Muscle, Skeletal physiology MeSH
- Humans MeSH
- Computer Simulation MeSH
- Energy Transfer physiology MeSH
- Regression Analysis MeSH
- Models, Statistical MeSH
- Muscle Contraction physiology MeSH
- Weight-Bearing physiology MeSH
- Check Tag
- Adult MeSH
- Humans MeSH
- Male MeSH
- Female MeSH
- Publication type
- Research Support, Non-U.S. Gov't MeSH
The power supply for IEF based on features of the Cockcroft-Walton voltage multiplier (CW VM) is described in this work. The article describes a design of the IEF power supply, its electric characteristics, and testing by IEF analysis. A circuit diagram of the power supply included two opposite charged branches (each consisting of four voltage doublers). The designed CW VM was powered by 230 V/50 Hz alternate current and it generated up to 5 kV and 90 mW at the output. Voltage and current characteristics of the power supply were measured by known load resistances in the range from 10 kΩ to 1 GΩ, which is a common resistance range for IEF strip geometry. Further, the power supply was tested by a separation of a model mixture of colored pI markers using a 175 × 3 × 0.5 mm focusing bed. Automatically limited power load enabled analysis of samples without previous optimization of the focusing voltage or electric current time courses according to sample composition. Moreover, the developed power supply did not produce any intrinsic heat and was easy to set up with cheap and commonly available parts.
Cíl. Nové typy portkatétrů umožňují podávání kontrastních látek velkými rychlostmi až 5 ml/s. Cílem práce bylo zhodnocení přínosu vysokotlakých portkatétrů, tzv. power portů pro pacienty a jejich využívání v klinické praxi. Materiál a metodika. V období 7 měsíců bylo u 54 nemocných na dvou pracovištích implantováno 54 power port systémů umožňujících vysokorychlostní podání kontrastní látky. Tito pacienti byli prospektivně sledováni. Jednalo se o skupinu 33 žen a 21 mužů průměrného věku 52,6 let (22-74 let). Zavádění probíhalo na pracovišti intervenční radiologie s použitím ultrazvukové a skiaskopické navigace. Po výkonu bylo dotazníkovou metodou a telefonickým pohovorem zjišťováno využití portu při podání jódové kontrastní látky u CT vyšetření. Výsledky. Primární technická úspěšnost implantace v našem souboru byla 100%. Žádná významná periprocedurální komplikace nebyla zaznamenána. Portkatétr byl extrahován u tří pacientů (5,6 %), jednou pro centrální trombózu a dvakrát pro infekční komplikaci systému. Jeden pacient během sledování zemřel a dalších pět pacientů bylo ztraceno ze sledování. Průměrná doba sledování pacientů byla 138 dní (30-212 dní). V průběhu sledování bylo provedeno 18 kontrastních CT vyšetření u 17 pacientů (34,7 %). Portkatétr byl užit u devíti pacientů k provedení 9 CT vyšetření (52,9%, resp. 50%) a periferní žíla byla kanylovaná u osmi pacientů pro 9 CT vyšetření (47,1 %, resp. 50 %). Během CT vyšetření s užitím portkatétrů nebyla zaznamenána žádná procedurální komplikace. Důvodem, proč nebyla kontrastní látka podána přes portkatétr, byla nezkušenost personálu CT pracovišť s napichováním komůrky portkatétrů. Závěr. Technika radiologicky asistované implantace power portů a konvenčních portů se neliší. Vysokorychlostní podávání kontrastní látky přes portkatétry proběhlo bez komplikací. Procento portkatétrů použitých k podání kontrastní látky je srovnatelné s literárními údaji. Proškolení zdravotnického personálu a informovanost zejména na CT pracovištích by mělo vést k vyššímu využití power portkatétrů.
Aim. A new type of portcatheter allows high pressure aplication of contrast agent. We report prospective evaluation of central venous power portcatheters including their clinical benefit. Material and method. We have implat-ed 326 portcatheters during 7 months period (from March to September 2011). This group included 54 patients with power portcatheters (33 women and 21 men with mean age 52.6 years). Procedures were performed in local anesthesia under sonographic and fluoroscopic guidance. Results. Primary technical success was 100% with none procedural complication. Portcatheter had to be removed in 3 patients (5.6%) due to port system infection in two patients and central vein thrombosis in one. One patient died and 5 patients were lost from follow-up. Mean follow-up was 138 days (range 30-212 days). During follow-up, 18 contrast enhaced CT scans were performed in 17 patients (34.7%). Power portcatheter was used in 9 patients for 9 CT scans (52.9%, respectively 50%) and peripheral vein in 8 patients for 9 contrast CT scans (47.1%, respectively 50%). During contrast CT examination, none complication related to the implanted device occurred. Conclusion. The procedure of power portcatheter implantation is the same as for conventional portcatheters. High pressure contrast media injection through the device was feasibile and without complication. Radiological staff education and awareness seems to be important for more frequent power portcatheter utilization for contrast enhaced CT examination.
- Keywords
- intravenózní přístup, port, power portkatétr, procedurální komplikace, pozdní komplikace,
- MeSH
- Radiography, Interventional methods utilization MeSH
- Ultrasonography, Interventional methods instrumentation trends MeSH
- Infusions, Intravenous methods trends utilization MeSH
- Contrast Media administration & dosage diagnostic use MeSH
- Medical Oncology methods trends MeSH
- Humans MeSH
- Multidetector Computed Tomography methods trends utilization MeSH
- Tomography, X-Ray Computed methods trends utilization MeSH
- Prospective Studies MeSH
- Surveys and Questionnaires MeSH
- Statistics as Topic MeSH
- Jugular Veins MeSH
- Outcome and Process Assessment, Health Care MeSH
- Catheters, Indwelling adverse effects trends utilization MeSH
- Check Tag
- Humans MeSH
- MeSH
- Nuclear Reactors history utilization MeSH
- Power Plants instrumentation statistics & numerical data utilization MeSH
- European Union organization & administration MeSH
- Nuclear Energy legislation & jurisprudence MeSH
- Humans MeSH
- Radiation Protection methods standards legislation & jurisprudence MeSH
- Radioactive Waste economics adverse effects MeSH
- Legislation as Topic MeSH
- Check Tag
- Humans MeSH
- Geographicals
- Slovakia MeSH
