18 research outputs found
Reduced physical fitness in children and adolescents with type 1 diabetes
SUMMARY
Aims: To evaluate motor performance and cardiorespiratory function in youths with type 1 diabetes in comparison with age-matched control group; and to analyse the influence of physical activity level, anthropometric and physical fitness parameters on long-term metabolic control.
Methods: 106 youths with diabetes and 130 healthy youths aged 8-18 were assessed by the Eurofit Test Battery regarding motor performances, cardiorespiratory fitness (VO2max), skinfold thickness, and body mass index. Physical activity level was assessed through the use of questionnaires. Predictors of physical fitness and metabolic control were determined with regression analysis.
Results: There were no differences either in body composition or in physical activity level, but younger girls with diabetes had impaired results in speed of upper limb movement, abdominal muscle strength, upper body strength, running speed and VO2max; older girls with diabetes had poor results in speed of upper limb movement, abdominal muscle strength, upper body strength and VO2max. Younger boys with diabetes had impaired results in speed of upper limb movement, flexibility, static strength of the hand and abdominal muscle strength; and older boys with diabetes had poor results in speed of upper limb movement, flexibility, abdominal muscle strength, upper body strength and VO2max. Older age, female gender, higher skinfold thickness, lower physical activity level and higher HbA1c were significant independent predictors of poorer VO2max. Better VO2max proved to be the single predictor of favourable HbA1c.
Conclusions: Youths with diabetes have reduced fitness parameters. Efforts should be carried out to improve physical fitness as part of treatment and care of children and adolescents with type 1 diabetes
A CPT-szimmetria kĂsĂ©rleti ellenĹ‘rzĂ©se lassĂş antiprotonokkal = Experimental test of the CPT symmetry using slow antiprotons
KutatĂłmunkánk alapvetĹ‘ motiváciĂłja a CPT-invariancia, anyag Ă©s antianyag szimmetriájának kĂsĂ©rleti ellenĹ‘rzĂ©se az ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) TokiĂł-Aarhus-BĂ©cs-Brescia-Budapest-Debrecen egyĂĽttműködĂ©s keretĂ©ben, a CERN antiproton-lassĂtĂł berendezĂ©sĂ©nĂ©l, az antiproton tulajdonságainak mind pontosabb mĂ©rĂ©sĂ©vel a protonĂ©val összehasonlĂtva. Az antiproton tömegĂ©t Ă©s töltĂ©sĂ©t antiprotonos hĂ©liumatomok energiátmeneteinek lĂ©zerspektroszkĂłpiás mĂ©rĂ©sĂ©vel határozzuk meg, a mágneses momentumát pedig felhasadt hiperfinom állapotok gerjesztĂ©sĂ©vel lĂ©zer-mikrohullám-lĂ©zer hármas rezonancia segĂtsĂ©gĂ©vel. A tömeg Ă©s töltĂ©s meghatározását Ă©vrĹ‘l Ă©vre tovább pontosĂtottuk a lĂ©zertechnika javĂtásával Ă©s lassĂş antiprotonnyaláb kialakĂtásával, amely lehetĹ‘vĂ© tette az antiprotonok megállĂtását igen kis nyomásĂş (<1 mbar) gázban Ă©s meghonosĂtottuk a kĂ©tfotonos, csaknem teljesen Doppler-mentes lĂ©zerspektroszkĂłpia mĂłdszerĂ©t. Sikeres elsĹ‘ kĂsĂ©rletsorozatot vĂ©geztĂĽnk a mágneses momentum mĂ©rĂ©sĂ©re. JelentĹ‘s Ăşjabb eredmĂ©nyeket Ă©rtĂĽnk el a MUSASHI lassĂş antiproton-forrás fejlesztĂ©sĂ©ben is, az komoly felhasználĂłi berendezĂ©ssĂ© nĹ‘tte ki magát. BefejeztĂĽk az antihidrogĂ©n mágneses momentumának mĂ©rĂ©sĂ©re szolgálĂł berendezĂ©s terveit Ă©s megkezdtĂĽk annak Ă©pĂtĂ©sĂ©t. Az antiprotonos kĂsĂ©rletek Ă©rtelmezĂ©sĂ©hez szĂĽksĂ©ges a lassĂş töltött rĂ©szecskĂ©k ĂĽtközĂ©si folyamatainak tisztázása, abban is jelentĹ‘s - fĹ‘leg elmĂ©leti - eredmĂ©nyeket Ă©rtĂĽnk el. | The basic motivation of our research work is the experimental test of CPT invariance, the symmetry principle of matter and antimatter within the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) Tokyo-Aarhus-Brescia-Budapest-Debrecen-Vienna collaboration at the Antiproton Decelerator facility at CERN. We measure the properties of the antiproton in comparison with those of the proton. The mass and charge of the antiproton is determined by measuring the transition energies of antiprotonic helium using laser spectroscopy and its magnetic moment via exciting transitions with hyperfine splitting using a laser-microwave-laser triple resonance technique. We have increased the precision of determining the antiproton mass and charge by improving the lasers and by forming a slow antiproton beam which facilitates stopping it in gases of very low (<1 mbar) pressures and performed a first measurement using quasi Doppler-free two-photon spectroscopy. We completed the first successful series of measurements of the magnetic moment of the antiproton. The development of the MUSASHI slow antiproton source is almost complete, it became a real user facility. We have completed the design of the apparatus for measuring the magnetic moment of antihydrogen atoms and started its construction. For the interpretation of the antiprotonic experiments the collision processes of slow charged particles have to clarified: we made good - mostly theoretical - progress there as well
Alapvető szimmetriák vizsgálata antiprotonokkal = Study of fundamental symmetries using antiprotons
TevĂ©kenysĂ©gĂĽnk a CERN Antiproton-lassĂtĂłja melletti ASACUSA egyĂĽttműködĂ©s kĂĽlönbözĹ‘ kĂsĂ©rleteihez kapcsolĂłdik, fĹ‘kĂ©nt az anyag Ă©s antianyag egyenĂ©rtĂ©kűsĂ©gĂ©t kimondĂł CPT-invariancia kĂsĂ©rleti ellenĹ‘rzĂ©sĂ©re. HangolhatĂł lĂ©zerrel átmenetet stimulálunk antiprotonos hĂ©liumatom hosszĂş Ă©s rövid Ă©lettartamĂş állapotai között, az átmeneti energiábĂłl meghatározzuk az antiproton Ă©s az elektron tömegĂ©nek hányadosát. A mĂ©rĂ©seinket egĂ©szen ritka Ă©s hideg gázban vĂ©gezve, a lĂ©zerfrekvenciát frekvenciafĂ©sűvel stabilizálva, az atomi mozgás miatti Doppler-hatást kĂ©tfotonos gerjesztĂ©ssel csökkentve, a protonĂ©hoz közeli pontosságot Ă©rtĂĽnk el az antiproton tömegĂ©nek meghatározásában. A lĂ©zer-mikrohullám-lĂ©zer hármas rezonancia mĂłdszerĂ©vel meghatároztuk az antiproton mágneses momentumát hĂ©lium-4 Ă©s hĂ©lium-3 atomokban Ă©s az elmĂ©letivel egyezĹ‘ spektrumokat kaptunk. PrototĂpust Ă©pĂtettĂĽnk az antihidrogĂ©n előállĂtására szolgálĂł kĂ©tmĂłdusĂş Paul-csapdához Ă©s megĂ©pĂtettĂĽk az antihidrogĂ©n kĂ©pzĹ‘dĂ©sĂ©t ellenĹ‘rzĹ‘ detektorrendszerĂĽnket. KisenergiájĂş antiproton Ă©s hidrogĂ©n molekula ĂĽtközĂ©sĂ©ben meghatároztuk az egyszeres ionizáciĂłs hatáskeresztmetszeteket Ă©s elmĂ©leti számĂtásokat vĂ©geztĂĽnk egyszeresen Ă©s kĂ©tszeresen differenciális hatáskeresztmetszetekre antiproton Ă©s hĂ©lium ĂĽtközĂ©seiben, valamint hidrogĂ©n- Ă©s vĂzmolekula ionizáciĂłjára polarizált lĂ©zertĂ©rben. MegmĂ©rtĂĽk az ionvezetĂ©s hĹ‘mĂ©rsĂ©kletfĂĽggĂ©sĂ©t kapillárisokban Ă©s rámutattunk, hogy kis energián rugalmas ĂĽtközĂ©s, nagyobbakon a Coulomb-taszĂtás dominál. | Our activity is connected to the experiments of the ASACUSA collaboration at the Antiproton Decelerator of CERN, mainly to the tests of CPT invariance, stating the equivalence of matter and antimatter. Using tunable lasers to stimulate transitions between short- and long-lived states in antiprotonic helium atoms, from the transition energies we determine the antiproton-to-electron mass ratio. Performing the measurements in low-pressure cold gas, stabilising the laser tune using a frequency comb and reducing the Doppler broadening from atomic motion using two-photon spectroscopy we managed to reach a precision of determining to antiproton mass close to that of the proton. Using a laser-microwave-laser triple resonance technique we have measured the magnetic moment of the antiproton in He-4 and He-3 atoms in agreement with the theoretical predictions. We have built a prototype of a two-tone Paul-trap for antihydrogen formation and also a detector system for testing antihydrogen annihilation. We have measured single ionization cross sections for collisions of low-energy antiprotons with hydrogen molecules and calculated singly and doubly differential cross sections for collisons of antiprotons with helium and also for the ionization of hydrogen and water molecules in a polarized laser field. Measured the temperature dependence of ionic conductivity in capillaries and showed that at low energies elastic collisions whereas at higher ones Coulomb repulsion dominate
A Standard Modell ellenőrzése elektron-pozitron és proton-proton ütközésekben = Test of the Standard Model in electron-positron and proton-proton collisions
A pályázat támogatásával csoportunk befejezte a CERN LEP gyorsĂtĂłjának OPAL kĂsĂ©rletĂ©ben korábban megkezdett munkáját, majd csatlakozott a rövidesen indulĂł LHC CMS kĂsĂ©rletĂ©hez. Az OPAL adatait analizálva egyebek között a töltött Higgs bozonokra adtunk alsĂł tömeghatárt, illetve a foton-foton ĂĽtközĂ©sekben törtĂ©nĹ‘ hadronkĂ©pzĹ‘dĂ©st vizsgáltuk. A CMS kĂsĂ©rletben a szuperszimmetrikus rĂ©szecskĂ©ket keresĹ‘ munkacsoport tevĂ©kenysĂ©gĂ©be kapcsolĂłdtunk be, továbbá a kĂsĂ©rlet elosztott számĂtĂłgĂ©pes hátterĂ©nek (LHC Grid) magyarországi rĂ©szĂ©t telepĂtettĂĽk Ă©s teszteltĂĽk. Jelenleg a CMS Ăşn. T2 szintű számĂtási Ă©s adattárolási kapacitásának kb. 2%-át biztosĂtjuk, Ă©s az egyĂĽttműködĂ©s többi rĂ©sztvevĹ‘jĂ©vel közösen folytatjuk a felkĂ©szĂĽlĂ©st az LHC indulásakor Ă©rkezĹ‘ adatok feldolgozására. | With this grant our group concluded its ongoing work in the OPAL experiment at CERN's LEP accelarator, and joined the CMS experiment of the starting LHC. Analysing OPAL data we gave, among others, a lower mass limit for charged Higgs bosons, and investigated hadron production in photon-photon collisions. In the CMS experiment we joined the group searching for supersymmetric particles, and we installed and tested the Hungarian part of the experiment's distributed computing infrastructure (LHC Grid). At the moment we cover about 2% of the T2 level CMS computing and storage capacity, and along with other participants of the collaboration we are continuing the preparations for handling the data that will arrive after the LHC startup
Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3
In this work we describe the latest results for the measurements of the
hyperfine structure of antiprotonic helium-3. Two out of four measurable
super-super-hyperfine SSHF transition lines of the (n,L)=(36,34) state of
antiprotonic helium-3 were observed. The measured frequencies of the individual
transitions are 11.12548(08) GHz and 11.15793(13) GHz, with an increased
precision of about 43% and 25% respectively compared to our first measurements
with antiprotonic helium-3 [S. Friedreich et al., Phys. Lett. B 700 (2011)
1--6]. They are less than 0.5 MHz higher with respect to the most recent
theoretical values, still within their estimated errors. Although the
experimental uncertainty for the difference of 0.03245(15) GHz between these
frequencies is large as compared to that of theory, its measured value also
agrees with theoretical calculations. The rates for collisions between
antiprotonic helium and helium atoms have been assessed through comparison with
simulations, resulting in an elastic collision rate of gamma_e = 3.41 +- 0.62
MHz and an inelastic collision rate of gamma_i = 0.51 +- 0.07 MHz.Comment: 15 pages, 9 figures. arXiv admin note: substantial text overlap with
arXiv:1102.528