Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Polymer and Materials Science  (3)
  • Sympathetic system  (2)
  • Treadmill exercise  (2)
Material
Years
Keywords
  • 1
    ISSN: 1432-1440
    Keywords: Primary orthostatic hypotension ; Sympathetic system ; Adrenoreceptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We evaluated sympathetic nervous system function in a patient with primary orthostatic hypotension. Plasma catecholamine levels — ecept for dopamine levels — and urinary catecholamine excretion were decreased, alpha-adrenoreceptor responsiveness to noradrenaline and beta-adrenoreceptor responsiveness to isoproterenol were increased according to increased beta-2-adrenoreceptor density on intact polymorphonuclear leukocytes. Alpha-2-adrenoreceptor density on intact platelets and adrenaline-induced platelet aggregation in vitro, however, were unchanged. We evolved a therapeutic regimen with fludrocortisone, propranolol, and dihydroergotamine that allowed the patient to resume nearly a regular degree of mobility.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-1440
    Keywords: Bicycle exercise ; Treadmill exercise ; Plasma catecholamines ; Energy metabolism ; Aercbic / anaerobic capacity ; Fahrradergometrie ; Laufbandergometrie ; Plasmacatecholamine ; Energiestoffwechsel ; aerob-anaerobe Kapazität
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 6 gesunden männlichen Probanden (28,0±2,6 Jahre) wurden Adrenalin, Noradrenalin, Glucose, Lactat, Freie Fettsäuren und Glycerin im Blut, sowie die Herzfrequenz und Sauerstoffaufnahme vor, während und nach einer stufenweise ansteigenden Laufbandergometrie (LBE) und Fahrradergometrie (FE) bestimmt. Adrenalin, Noradrenalin, die energiereichen Substrate und die Sauerstoffaufnahme unterscheiden sich während der LBE und FE auf submaximalen Stufen nicht, bei maximaler FE ist Noradrenalin 27% (0,10〉p〉0,05 höher, die Herzfrequenz ist 6% (p〈0,05), die Sauerstoffaufnahme 4% (p〉0,05), der Glycerinspiegel 25% (0,10〉p〉0,05) niedriger. Die Tendenz zur höheren Noradrenalinfreisetzung während der FE kann durch die größere statisch-pressorische Beanspruchung gegenüber einer dynamisch zirkulatorischen während der LBE bedingt sein. Die verstärkte Alpha-Rezeptoren-Stimulation führt zu einem negativ chronotropen Effekt, als dessen Ursache eine Barorezeptorenerregung anzunehmen ist. Die LBE bedingt eine höhere Zirkulation und eine günstigere Sauerstoffversorgung der Arbeitsmuskulatur und bevorzugte Fettoxidation, kenntlich am schnelleren Anstieg des Glycerinspiegels (0,10〉p〉0,05). Beide Ergometrieformen sind bezüglich der Arbeitsazidose — wenn auch bei der LBE die Tendenz zu einer geringeren Lactatproduction auf submaximalen Stufen besteht —, der Sauerstoffaufnahmefähigkeit, der energieliefernden Substrate und des Catecholaminverhaltens miteinander vergleichbar; eine Verfälschung tritt nur ein, wenn die Plasmacatecholamine und der Lactatspiegel auf die Herzfrequenz bezogen werden, da diese von der Art der Belastungsform mitbestimmt wird.
    Notes: Summary Adrenaline, noradrenaline, glucose, lactate, free fatty acids, and glycerine in blood, as well as heart frequency and oxygen intake were examined in 6 healthy male subjects (28±2.6 years) before, during and after a graduated treadmill (TME) and bicycle ergometer (BE) test. Adrenaline, noradrenaline, the energy supplying substrates, and the oxygen-intake show no differences during TME and BE at given submaximal levels. Noradrenaline is 27% (0.10〈p〈0.05) higher, pulse rate is 6% (p〈0.05) lower, oxygen intake 4% (〉0.05) lower, and the glycerine level 25% (0.10〈p〈0.05) lower during maximal BE exercise. The tendency toward a higher noradrenaline release during BE exercise can be influenced by a greater static-pressuric stress opposed to a dynamic-circulatory stress during TME testing. An increased alphareceptor stimulation leads to a negative chronotropic effect, whose cause is assumed to be a baroreceptor stimulation. The TME induces a higher circulation and a more economic oxygen supplying of the muscles exercised, as well as a favourable fat oxidation, which is recognizable by a more rapid increase of glycerine (0.10〈p〈0.05). When referring to exercise acidification (a tendency toward a lower lactate production during submaximal TME testing shows here), oxygen intake capability, energy supplying substrates, and the catecholamines, both forms of ergometer testing are comparable one to another; a falsification appears only when plasma catecholamines and lactate levels are based on the heart frequency, as it is influenced by the form of exercise.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 46 (1981), S. 305-315 
    ISSN: 1439-6327
    Keywords: Women ; Plasmacatecholamines ; Aerobic-anaerobic capacity ; Treadmill exercise ; Frauen ; Plasmacatecholamine ; Aerob-anaerobe KapazitÄt ; Laufbandergometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Adrenalin, Noradrenalin, Lactat und Glucose im Blut sowie die Herzfrequenz und O2-Aufnahme wurde bei neun gesunden Frauen (29,3±2,2 Jahre) wÄhrend einer stufenweisen Laufbandergometrie untersucht. In Ruhe unterscheiden sich alle Parameter gegenüber mÄnnlichen Probanden nicht. WÄhrend der Ergometrie sind wie bei mÄnnlichen Probanden zwei Bereiche zu unterscheiden: ein Bereich geringer Zunahme von Adrenalin, Noradrenalin und Lactat, entsprechend einer überwiegend aeroben Energiebereitstellung und ein Bereich mit acht- bis zehnmal höherer Zunahme von Adrenalin, Noradrenalin und Lactat, entsprechend einer zusÄtzlichen zunehmenden anaeroben Energiebereitstellung; der übergang zwischen beiden Bereichen entspricht dem aerob-anaeroben übergangsbereich und erfolgt wie bei mÄnnlichen Versuchspersonen bei einer O2-Aufnahme und Herzfrequenz von 70–80% und einer Catecholamin- und Lactatkonzentration von 20–30% des Maximalwertes. Adrenalin und Noradrenalin sind auf gleichen Belastungsstufen 0,3–1 ng/ml bzw. 2–4 ng/ml höher als bei mÄnnlichen Probanden. In Beziehung zur O2-AufnÄhme in Prozent des Maximalwertes oder zur Herzfrequenz, als Parameter für die relative Grö\e einer Belastung, gleichen sich die Unterschiede an. Es besteht wie bei mÄnnlichen Personen ein direktes lineares VerhÄltnis zwischen Adrenalin und Noradrenalin. WÄhrend der Ergometrie nehmen Adrenalin ca. 1300%, Noradrenalin ca. 1500%, Lactat ca. 1100%, Glucose ca. 30%, die Herzfrequenz ca. 200% und die O2-Aufnahme um ca. 1000% zu. Zwischen dem Catecholamin, dem Lactat- und Glucosespiegel bestehen direkte lineare Korrelationen. Bezogen auf die Catecholamine ist der Lactatspiegel niedriger als bei mÄnnlichen Versuchspersonen, was einem Schutzmechanismus gegen eine zu starke übersÄuerung entsprechen kann.
    Notes: Summary Blood levels of adrenalin, noradrenalin lactate, and glucose, and heart rate and oxygen intake were examined in nine healthy women (29.3±2.2 years) during a graduated treadmill exercise. At rest there are no differences in these parameters compared with male subjects. During treadmill exercise, two ranges can be distinguished as in male subjects. A range with a slight increase in adrenalin, noradrenalin, and lactate, corresponding to a predominantly aerobic energy supply, and a range with an eight to ten times higher increase of adrenalin, noradrenalin, and lactate related to an additionally increasing anaerobic energy supply. The transition between the two ranges corresponds approximately to the anaerobic threshold, and occurs as in male subjects at an oxygen intake and heart rate of 70–80% and a catecholamine and lactate concentration of 20–30% of the maximal value. At the same exercise level, adrenalin, and noradrenalin are higher than in male subjects. Differences in the relative oxygen intake or the heart rate are similar. During maximal treadmill exercise adrenalin increased by 1,300%, noradrenalin 1,500%, lactate 1,100%, glucose 30%, the oxygen intake 1,000%, and the heart rate by about 200%. During ergometric exercise, as in male subjects there is a direct linear correlation between adrenalin and noradrenalin. A direct linear correlation excists between the catecholamines and lactate or glucose levels. Referring to the catecholamines, the lactate level is lower than in male subjects, corresponding to a limitation of acidosis in females.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1439-6327
    Keywords: Sympathetic system ; Endurance training
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Six male non-endurance trained subjects (S) and six marathon runners (M) underwentgraded treadmill exercise (T) andisoproterenol stimulation (I; 2 and 4 Μg·min−1),β-adrenergic receptor density was additionally determined as the amount of3H-Dihydroalprenolol (DHA) specifically bound on intact polymorphonuclear leucocytes. Heart rate, $$\dot V_{{\text{O}}_{\text{2}} }$$ uptake, lactate, plasma noradrenaline, and adrenaline were estimated during T. Heart rate, stroke volume, cardiac output, as well as lactate, glucose, free fatty acids (FFA), and glycerol levels in the blood were determined during I. M showed the known training-dependent responses during T, such as lower heart rates, lactate levels, and plasma catecholamines at identical work loads, as well as higher $$\dot V_{{\text{O}}_{\text{2}} {\text{max}}}$$ than S. I-induced cardiac output increase was quite similar in both groups. Stroke volume, however, increased significantly in M and stayed constant in S. Lactate decreased (S), glucose increased significantly (M), glycerol increased similarly in both groups, FFA rise was less marked in S. I-induced stroke volume response (I) may be indicative of a more economic regulation of heart work in M than S. Lactate decrease and less marked FFA increase, as observed in S, may be the result of a somewhat higher cardiac energy demand, dependent on less economic heart work. Higher DHA-binding as observed in M, as well as stroke volume response and glucose increase, may be indicators of a training-dependent rise in sensitivity to catecholamines. The unsolved question is, however, to what extentβ-receptor responses in intact blood cells are significant for receptor behavior in other organs.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Investigations over the years have shown that the mirror-finished Al2O3 ceramic is a much more suitable frictional counterpart to ultrahigh molecular weight (UHMW) polyethylene than metal. Despite the extremely great hardness difference between polyethylene and Al2O3 ceramic, a considerable lower wear rate is obtained for the polyethylene socket with this new low-friction material combination. The unexpectedly favorable tribological behavior of this ceramic material in contact with polyethylene may be attributed to the following factors: better values for corrosion resistance characteristics, wettability with liquids, surface gloss, hardness, and scratch resistance of the ceramic material in comparison with those of the hitherto used metallic implant materials (AISI-316L steel or cast Co—Cr—Mo alloy). It appears that, by using this new combination of materials for the socket and the ball, it will be possible to prolong the service life of artificial hip joints considerably without having to effect any fundamental changes in the present design and implantation principle retaining the hitherto used anchorage shaft made of wrought Co—Ni—Cr—Mo—Ti alloy Protasul-10 of extremely high corrosion fatigue strength.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 655-657 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 19-22 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Crosslinking of novolac fibres was studied by means of plasma etching in connection with light and scanning electron microscopy. With proceeding crosslinking by formaldehyde from the outer skin to the inner of the fibre a highly cross-linked shell of not more than 10 to 13 μm thickness was formed after about 8 h crosslinking time. On the other hand, more porous networks of modified novolacs permit a rapid and complete crosslinking of the fibres.
    Notes: Mittels Plasmaätzung in Verbindung mit Licht- und Rasterelektronenmikroskopie wurde der Vernetzungsverlauf von Phenolharznovolakfasern verfolgt. Bei der von außen nach innen fortschreitenden Vernetzung mit Formaldehyd bildet sich im Zeitraum von etwa 8 h eine 10 bis 13 μm dicke Schicht aus, deren Netzwerkdichte eine weitere Vernetzung des Faserinneren verhindert. Weitmaschiger aufgebaute Netzwerke modifizierter Ausgangsnovolake hingegen lassen eine schnelle und vollständige Durchvernetzung der Fasern zu.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...