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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 64 (1986), S. 264-271 
    ISSN: 1432-1106
    Keywords: Sensory threshold ; Microgravity ; Linear acceleration ; Adaptation ; Otoliths
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thresholds for the detection of linear oscillatory motion at 0.3 Hz in the X, Y and Z body axes were determined during the flight of Spacelab-1 and on the ground pre- and post-flight, using the method of limits with a single staircase procedure. Pre-flight, Z axis thresholds (mean 0.077 ms−2) were significantly higher than X and Y thresholds (mean 0.029 ms−2). Measures obtained on three crew members in-flight exhibited thresholds greater, by a factor of 1.5–4.3, than those obtained pre-flight. Post-flight, two crew members had significantly elevated X and Y axis thresholds whereas the other two crew members had lowered thresholds in X, Y and Z axes. In general, thresholds had returned to pre-flight levels by the second post-flight day. A possible explanation for these somewhat disparate responses is presented.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2013
    Keywords: Alveolar Ventilation ; Pulmonary Blood Flow ; O2 Diffusing Capacity ; AaD Caused by Distribution Irregularities ; AaD Caused by Shunt ; Alveoläre Ventilation ; Lungendurchblutung ; O2-Diffusions-kapazität ; verteilungsbedingteAaD ; shuntbedingteAaD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Nach dem Verfahren der Verteilungsanalyse von Ventilation $$\dot V_A $$ , Perfusion, $$\dot Q$$ und O2-DiffusionskapazitätD L in der menschlichen Lunge werden 14 lungengesunde Jugendliche, 6 ältere Personen mit chronischer Emphysembron-chitis und 10 lungengesunde Schwangere untersucht. Das Verfahren liefert neben den Verteilungskurven für die Funktionsgrößen $$\dot V_A ,\dot Q$$ undD L die folgenden über die gesamte Lunge gemittelten Werte: das Ventilations-Perfusions-Verhältnis das O2-Diffusionskapazitäts-Perfusions-Verhältnis, die alveolären, die endcapillären und die arteriellen O2-bzw. CO2-Drucke, die Anteile der alveolär-arteriellen Druckdifferenzen sowie die Absolutwerte für die alveoläre Ventilation, die Lungendurchblutung, die O2-Diffusionskapazität und den extrapulmonalen Kurzschlußblut-Anteil. Die wesentlichen Ergebnisse der Untersuchung sind in der folgenden Tabelle, zusammengefaßt. Die Gründe für die differierenden Funktionswerte in den einzelnen Personen-gruppen werden diskutiert.
    Notes: Summary 14 adolescents with healthy lungs, 6 elderly people with chronic emphysema bronchitis, and 10 pregnant women with healthy lungs, were examined by the method of distribution analysis of ventilation, $$\dot V_A $$ , perfusion, $$\dot Q$$ , and O2 diffusing capacity,D L. Besides the distribution curves for the function values, $$\dot V_A $$ , $$\dot Q$$ , andD L, this method also furnishes the following average values, which were obtained throughout the lung: the ventilation-perfusion ratio, the O2 diffusing capacity-perfusion ratio, the alveolar, endcapillary, and arterial O2 and CO2 pressures, the components of the alveolar-arterial pressure differences, as well as the absolute values for the alveolar ventilation, lung perfusion, O2 diffusing capacity and the extrapulmonary shunt component. The essential test results are summarized in the following table: The reasons for the varying functional results, found in the individual groups, are discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 48 (1982), S. 399-405 
    ISSN: 1439-6327
    Keywords: Motion sickness ; Car sickness ; Linear acceleration ; Linear acceleration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thirty-eight normal volunteers were tested in an ambulance car while being accelerated in one of the following positions: (1) sitting upright facing forward in the car, (2) lying supine on a stretcher head forward, (3) supine position head backward. Consecutive short periods of negative horizontal acceleration (0.7–0.95 g) were achieved by brisk braking manoeuvres of the car, followed by weak reacceleration (0.15 g). Motion sickness symptoms were observed and recorded after each experiment using a special motion sickness scaling index which was weighted according to the strength of any particular symptom. The results indicate that horizontal linear acceleration in a car, such as experienced during multiple braking manoeuvres, is an effective motion sickness provoking stimulus. Negative X-axis stimulation is more nauseogenic then acceleration in the Z-axis stimulation is more nauseogenic then acceleration in the Z-axis of the body.
    Type of Medium: Electronic Resource
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