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  • Articles: DFG German National Licenses  (2)
  • Magnetic resonance imaging  (1)
  • Monitoring  (1)
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  • Articles: DFG German National Licenses  (2)
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  • 1
    ISSN: 1439-6327
    Keywords: Key words Peak V ; O2 ; Anaerobic performance ; Muscle volume ; Magnetic resonance imaging ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study examined the relationships between thigh muscle volume (TMV) and aerobic and anaerobic performance in children. A total of 32 children, 16 boys and 16 girls, aged 9.9 (0.3) years completed a treadmill running test to exhaustion for the determination of peak oxygen uptake (peak V˙O2) and a Wingate Anaerobic Test (WAnT) for the determination of peak power (PP) and mean power (MP). The volume of the right thigh muscle was determined using magnetic resonance imaging. TMV was not significantly different in boys and girls [2.39 (0.29) l vs 2.18 (0.38) l, P 〉 0.05]. Peak V˙O2 and MP were significantly higher in boys than girls (P 〈 0.01) whether expressed in absolute, mass-related or allometrically scaled terms. Absolute PP was not significantly different in boys and girls but mass-related and allometrically scaled values were higher in boys (P 〈 0.01). TMV was correlated with absolute peak V˙O2, PP and MP in both sexes (r = 0.52–0.89, P 〈 0.01). In boys, mass-related PP was correlated with TMV (r =0.53, P 〈 0.01), and in girls mass-related peak V˙O2 was correlated with TMV (r = −0.61, P 〈 0.01). However, in neither sex were allometrically scaled peak V˙O2, PP or MP correlated with TMV (P 〉 0.05). There were no significant differences between boys and girls in terms of peak V˙O2, PP or MP when expressed in a ratio to TMV or allometrically scaled TMV. In conclusion, this study has demonstrated that, when body size is appropriately accounted for using allometric scaling, TMV is unrelated to indices of aerobic and anaerobic power in 10-year-old children. Furthermore, there appear to be no qualitative differences in the muscle function of boys and girls in respect of aerobic and anaerobic function.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 14 (1976), S. 61-64 
    ISSN: 1741-0444
    Keywords: Radiotelemetry ; Arterial pressure ; Transmitter ; Monitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire On a conçu un transmetteur radiotélémétrique se conformant aux normes de télémtrie biomédicale du gouvernement britannique, pour l'entegistrement soit intermittent, soit continu de la pression intra-artérielle de sujets complètement ambulants. La fréquence d'un sous-porteur de 1 kHz est modulée par l'onde de pression, la fréquence du sous-porteur est elle-même modulée à 17060 MHz sur un oscillateur controlé par cristal, et après multiplication de la fréquence, produit un signal de sortie entrainant une antenne de demionde à 102 360 MHz. L'appareil a été utilisé avec succès pour des périodes de contrôle allant de 3 à 36 h.
    Abstract: Zusammenfassung Es wurde ein Funktelemetrie-Sender, der den staatlichen britischen Vorschriften für die biomedizinische Telemetrie entspricht, für die zeitweise oder ständige Aufzeichnung des intra-arteriellen Drucks an völlig ambulanten Patienten erfunden. Durch die Druckwellenform wird die Frequenz eines Zwischenträgers von 1 kHz moduliert. Die Frequenz des Zwischenträgers wird wiederum bei 17 060 MHz zu einem quarzgesteuerten Oszillator moduliert, durch den sich nach Frequenzmultiplikation eine Leistung ergibt, die eine integrale Halbwellenantenne mit 102,360 MHz antreibt. Der Sender wurde mit Erfolg zur Überwachung von Zeiten zwischen 3 und 36 Stunden eingesetzt.
    Notes: Abstract A radiotelemetry transmitter conforming to British Governmental specifications for biomedical telemetry has been devised for either intermittent or continuous recording of intra-arterial pressure in fully ambulant subjects. A1 kHz subcarrier is frequency modulated by the pressure waveform, the subcarrier being in turn frequency modulated on to a crystal-controlled oscillator at 17·060 MHz which, after frequency multiplication, produces an output to drive an integral halfwave aerial at 102·360 MHz. The apparatus has been successfully used for monitoring for periods of 3 to 36 h.
    Type of Medium: Electronic Resource
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