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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 1041-1042 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The level of plasma iron was investigated daily in six men and two women4, the total serum binding capacity for iron in four5 and in all subjects the urinary iron excretion6. Blood specimens were collected between 7 and 8 a.m. during the control period before the experiment, then during five days ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Basic research in cardiology 73 (1978), S. 160-170 
    ISSN: 1435-1803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Autoren untersuchten bei 9 Patienten mit ischämischen Herzleiden die arterio-koronarvenöse Differenz von freien Fettsäuren im Serum unter Ruhebedingungen und während künstlichem Schrittmacherantrieb. Bei körperlicher Ruhe war Aspartat die einzige Aminosäure mit einer ausgesprochenen positiven arterio-koronarvenösen Differenz. Auf dem Höhepunkt des Schrittmacherantriebs war zusätzlich zum Aspartat eine positive arteriovenöse Differenz für Glutamat, Leucin und Isoleucin und eine signifikant negative Differenz für Cystin-Cystein und Glutamin zusammen mit Asparagin zu verzeichnen. Ausgedrückt als Prozentsatz des arteriellen Spiegels war die negative Differenz auch bei Alanin signifikant. Bei wechselseitiger Korrelation der arteriovenösen Differenzen war die negative Beziehung zwischen Alanin und Lactat am eindeutigsten, was dafür spricht, daß unter normalen Bedingungen Pyruvat eher zu Alanin umgeformt wird, während im Zustand der Ischämie Lactat aus Pyruvat gebildet und vom Herzmuskel freigesetzt wird. Auch ergibt sich eine positive Korrelation zwischen Alanin und Glutamat und zwischen Leucin, Isoleucin und Glutamat. Andererseits korreliert Cystin-Cystein hoch signifikant, aber invers mit Leucin, Isoleucin und Glutamat. Die arterio-koronarvenöse Differenz von Aspartat, obwohl signifikant positiv, korreliert nicht mit irgendeiner anderen Aminosäure. Die arteriovenösen Differenzen von Ammoniak und Harnsäure korrelieren invers, wobei Harnsäure im Gegensatz zu Ammoniak praktisch nicht aus dem Herzmuskel freigesetzt wird.
    Notes: Summary In nine patients with ischemic heart disease the authors investigated the arterio-coronary venous difference of free amino acids in serum at rest and during pacing. At rest aspartate was the only amino acid with a marked positive arterio-coronary venous difference. At the peak of pacing, in addition to aspartate, there is a significant positive arterio-coronary venous difference in glutamate, leucine and isoleucine and a significantly negative difference in cystine-cysteine and glutamine with asparagine. When expressed in per cent of the arterial level, the negative difference in alanine is also significant. Among the mutual correlations of arterio-coronary venous differences the negative correlation between alanine and lactate is most significant, which suggests that under normal conditions pyruvate is transformed rather to alanine, while in ischemia lactate is formed from pyruvate, and released from the heart muscle. There is also a positive correlation between alanine and glutamine and between leucine, isoleucine and glutamate. On the other hand, cystine-cysteine correlates very significantly but inversely with leucine, isoleucine and glutamate. The arterio-coronary venous difference of aspartate, though significantly positive, does not correlate with any other amino acid. The arterio-coronary vernous differences of ammonia and uric acid correlate inversely, whereby uric acid, contrary to ammonia, is practically not released from the heart muscle.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 32 (1976), S. 1117-1118 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Prolonged sleep deprivation elicits a significant elevation of the plasma level of free tryptophan which appears to be involved in increased excretion of 5-HIAA during this state through enhanced 5-HT synthesis.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 24 (1968), S. 901-902 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wird gezeigt, dass Schlafentzug die Ausscheidung der 5-Hydroxyindolessigsäure und der Xanthurensäure vermehrt und diejenige der Antranilsäure herabsetzt.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Desferrioxamin B causes an increased elimination of glucose from the blood, as shown by i.v. glucose tolerance tests in healthy subjects. Desferrioxamin B was given in two doses of 500 mg one hour and immediately before the test (i.m. and i.v. respectively).
    Notes: Zusammenfassung Der Einfluß von Desferrioxamin B auf den Glucosestoffwechsel wurde bei 8 gesunden Versuchspersonen untersucht. Bei intravenöser Glucosebelastung bewirkte Desferrioxamin (500 mg i.m. 1 Std vorher und 500 mg i.v. unmittelbar vorher) eine signifikante Beschleunigung der Glucoseelimination aus der Blutbahn.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1439-6327
    Keywords: Human muscle biopsy ; Sleep deprivation ; Enzymes of muscle energy metabolism ; Stress and energy metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of 120-h sleep deprivation on the activity of selected enzymes of energy metabolism in skeletal muscle was studied in seven healthy volunteers. The results showed a significant decrease in the activity of malate dehydrogenase, citrate synthase, glycerol-3-phosphate dehydrogenase and lactate dehydrogenase. Triosephosphate dehydrogenase, hexokinase, and hydroxyacyl-CoA-dehydrogenase activities showed an insignificant decrease. The findings are indicative of (1) decreased aerobic oxidation capacity; (2) reduced function of reducing-equivalent carriers from cytosol across the mitochondrial membrane; (3) relative accentuation of the non-aerobic glycolytic pathway; (4) a prediabetic type of muscle metabolism.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 49 (1982), S. 215-222 
    ISSN: 1439-6327
    Keywords: Serum iron ; Circadian rhythms ; Sleep deprivation ; Serotonin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of 5 days of sleep deprivation on the circadian rhythm of serum iron was studied in a group of six healthy male volunteers. The results were compared with a control group of five individuals, whose normal sleep cycle was preserved, but whose daily regimen was otherwise identical with the sleep deprivation group. Their biorhythm was processed mathematically using cosinor analysis. Sleep deprivation markedly reduced the mean level of iron, diminished the absolute and relative amplitude of oscillations, disturbed the shape of the daily course of serum iron and gradually decreased the computative acrophase, i.e., shortened the period of rhythm. Forty-eight hours of recovery resulted only in a partial normalization of all the observed changes. The potential mechanisms of the observed changes are discussed.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 55 (1986), S. 83-87 
    ISSN: 1439-6327
    Keywords: Sleep deprivation ; Stress ; Plasma cholesterol ; Muscle cholesterol ; Fractional esterification rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of 5-day sleep deprivation (SD) on cholesterol metabolism, together with triglyceridaemia, was studied in seven healthy male volunteers. A 3-day control period was followed by 5 days (120 h) complete SD and 4 days recovery. Blood was collected at 9 a.m. and at 9 p.m. Vastus lateralis muscle biopsy was performed during the control period, on the 5th day of SD, and on day 3 of recovery. The value of muscle cholesterol was related to the non-collagen protein content. The plasma triglycerides (TG) varied in a circadian biorhythm, the amplitude of which declined gradually during SD. The morning triglyceridaemia was significantly decreased on days 3–5 of SD (35%–79% of initial values). On days 4 and 5 of SD, plasma cholesterol fell significantly to 78% and 88% of control values, respectively. The ratio of its esterified to unesterified fractions remained unchanged throughout SD. Basal activity of lecithin cholesterol acyltransferase (LCAT) showed no diurnal biorhythm; on the last 2 days of SD, LCAT activity fell significantly to 71%–80%. In contrast, the decrease in fractional esterification rate (FER) was insignificant. In the vastus lateralis muscle, total cholesterol (TC) was decreased by 40% at the end of SD, the reduction being greater for cholesterol esters (CE) (by 63%) than for free cholesterol (FC) (by 36%). The relative proportion of CE significantly decreased from an initial 14.7% to 9.2% on the last day of SD. During recovery after SD, plasma cholesterol and TG slowly returned to normal. LCAT activity and FER recovered quickly, within 48 h. In the muscle, recovery was characterized by cholesterol accumulation, particularly by that of its esterified fraction: TC increased by 11%, CE by 57%, and FC by 3% over the respective control values. The percentage of CE rose to 20.7%. It may be concluded that SD has a profound influence on cholesterol metabolism. Some changes resemble those characterizing cardiovascular diseases.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 27 (1969), S. 25-33 
    ISSN: 1439-6327
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a group of seven men the increase of the pulse rate at the onset of standard exercise on a bicycle ergometer and the drop during recovery were assessed, during the control period and after 60 h fasting. Analysis into a rapid (vagus, central) component of the pulse increment and a slow (peripheral, sympathetic) component was made and their velocity constants were obtained. Fasting lead to a rise of the pulse increment and an increase of the sympathetic component at the expense of the component of vagus inhibition. These results confirm that acute fasting leads to a drop of physical performance, as under normal conditions analogous changes are caused by more intense exercise.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 23 (1966), S. 42-52 
    ISSN: 1439-6327
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Die Autoren haben die Dynamik der nicht metabolischen Veränderungen des RQ bei Anstrengung durch das sog. Tangentendiagramm analysiert. Es wurden insbesondere folgende Parameter ausgewertet: 1. die maximale Zunahme des Sauerstofferbrauchs (Δ O2 max), 2. die maximale Zunahme des RQ (Δ RQ max), 3. der aerobe-anaerobe Koeffizient (KA∶AN) als Verhältnis zwischen den beiden zuvor angeführten Werten, 4. die Längsachse des cyclischen Diagramms (p) und 5. der Tangens des Winkels, der von der Geradenp mit der positivenx-Achse gebildet wird (tg α).
    Type of Medium: Electronic Resource
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