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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 33 (1974), S. 71-81 
    ISSN: 1439-6327
    Keywords: Reproducibility ; Heart Rate ; Respiratory Rate ; Physical Exercise ; Reproduzierbarkeit ; Herzschlagfrequenz ; Atemfrequenz ; Ergometerarbeit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Verhalten von Herzschlagfrequenz (HF) und Atemfrequenz (AF) beim Ablauf eines Programms mit Phasen von Ruhe, submaximalen Belastungen am Fahrradergometer und Erholung wurde in zwei Probandengruppen (20 weibliche, 18 männliche Personen) untersucht. Die Prüfung der Daten aus drei Wiederholungen des Programms in wöchentlichen Abständen erfolgte mittels Maßkorrelationskoeffizienten und Autokorrelationsfunktionen. Für die Variablen Herzschlagfrequenz und Atemfrequenz bestehen zwischen Werten gleicher oder ähnlicher Versuchsphasen innerhalb eines Versuchs gute bis sehr gute Korrelationen. Bei Wiederholungen des Versuchsprogramms im Abstand von 1 oder 2 Wochen ist die Reliabilität der HF in der Gruppe der Männer gering (r≤0,60), in der Gruppe der Frauen befriedigend. Die Reliabilität der AF erweist sich in beiden Fällen als etwas besser. Die individuelle Stabilität der HF- und AF-Verläufe wird mittels Autokorrelationsfunktionen untersucht. Während die HF-Verläufe für alle Probanden gleichermaßen stabil und untereinander ähnlich sind, treten bei der AF im Versuchsablauf individuell verschiedene Reaktionsweisen auf, deren Korrelationsfunktionen drei Gruppen zugeordnet werden können.
    Notes: Abstract A study has been made on the reproducibility of heart rate (HF) and respiratory rate (AF) in two groups of subjects (20 women, 18 men) using a program including phases of rest, three different submaximal loads on the bicycle ergometer, and recovery. The program was repeated three times with intervals of 1 week. The data were processed to get correlation coefficients and correlation functions. There is a good correlation in both variables (HF, AF) with regard to data on equal or similar phases within one program. If the data of phases of one program are compared with those of the same phase after repetition of the program with intervals of 1 or 2 weeks, the reliability of the HF is low (r≤0.60) for the male group but satisfactory for the female group. In both groups the reliability of the AF is somewhat higher. For individuals, stability of the course of HF and AF was investigated by means of autocorrelation functions. The course of HF was stable and similar among all persons examined. The course of AF shows different individual reactions. The corresponding correlation functions may be classified in three groups.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 47 (1981), S. 271-279 
    ISSN: 1439-6327
    Keywords: Local rhythmical muscle work ; Rest intervals ; iEMG ; Duration of the R-R interval ; Endurance time ; Recovery time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a model work place (hand-grip dynamometer), eleven subjects performed rhythmical hand-grip contractions to exhaustion (frequency 30/min). In each working cycle the contraction and rest phases were distinguished. The work to exhaustion was repeated four times (four working periods with 15-min rest intervals). The tests were performed at 40, 60, 80, 100% MVC. Analysis of Variance showed no difference in the group means (mean values of each working period and load level) for the duration of the contraction or rest phases, the integrated bioelectrical muscle activity (iEMG) of flexors, extensors, brachioradialis (iEMG referred to working cycle and contraction phase) or iEMG of the thenar muscles (referred to the working cycle), or in the duration of the R-R interval in the ECG during comparable periods of the experiments. The endurance times decreased from working period 1–4, and a similar decrease occurred in the force-time product. It may be concluded from these results that 15 min rest is insufficient for adequate recovery from hand-exhaustion exercise.
    Type of Medium: Electronic Resource
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