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
  • 1995-1999  (2)
  • Schlüsselwörter Chronische Herzinsuffizienz – körperliches Training – aerobe Kapazität  (1)
  • Ventilatory threshold  (1)
Material
Years
  • 1995-1999  (2)
Year
Keywords
  • 1
    ISSN: 1439-6327
    Keywords: Ventilatory threshold ; Lactate threshold ; Determinability ; Reproducibility ; Interobserver variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In healthy normal individuals (n = 69), coronary patients with myocardial ischaemia (n = 27) and patients with chronic heart failure (CHF, n = 33), four widely applied methods to determine ventilatory threshold (VT) were analysed: V-slope, ventilatory equivalent for O2 (EqO2), gas exchange ratio (R) and end-tidal partial pressure of oxygen. Lactate threshold [LAT, log lactate vs log oxygen uptake ( $$\dot V{\text{O}}_2 $$ )] was also determined. Analysis focused on rate of success of threshold determination, comparability of threshold methods, reproducibility and interobserver variability. Cycle ergometry protocols with ramp-like mode and graded steady-state mode used in exercise testing were considered separately. In healthy normal individuals and coronary patients with myocardial ischaemia, at least three VT could be determined during ramp-like mode and two VT during graded steady-state mode, 82% of the time. For CHF patients, the rate of successful determination of VT was lower. Compared to LAT, $$\dot V{\text{O}}_2 $$ at VT was significantly higher using R and EqO2 methods of VT determination in healthy normal subjects (P 〈 0.01), and significantly higher when using all four methods in coronary patients (P 〈 0.01 or P 〈 0.05, respectively). No difference was observed between $$\dot V{\text{O}}_2 $$ at VT and LAT in CHF patients. In healthy normal individuals, day-to-day reproducibility of VT and LAT was high (error of a single determination from duplicate determinations was between 3.9% and 6.2% corresponding to a $$\dot V{\text{O}}_2 $$ of 52.2 and 89.2 ml·min −1). Interobserver variability was low (error between 0.3% and 5% corresponding to a $$\dot V{\text{O}}_2 $$ of 9.8 and 68 ml·min−). In CHF patients, interobserver variability was moderately greater (error between 4.6% and 8.2%, corresponding to a $$\dot V{\text{O}}_2 $$ of 35.1 and 62.4 ml·min−1). To optimize threshold determination, standardized procedures are suggested.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für Kardiologie 87 (1998), S. 8-14 
    ISSN: 1435-1285
    Keywords: Key words Chronic heart failure – exercise training – aerobic capacity ; Schlüsselwörter Chronische Herzinsuffizienz – körperliches Training – aerobe Kapazität
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Standardized guidelines for exercise training for patients with chronic congestive heart failure (CHF) have not been established. In the past CHF patients involved in exercise training studies demonstrated a wide range of cardiac and functional impairment, with an ejection fraction between 18 and 35% and a peak VO2 between 12.2 and 25.4 ml/kg/min on average. For determination of training intensity, a VO2 between 40 and 70% of peak VO2 and/or training heart rate between 60 and 80% of peak heart rate was used. There was also a wide range for frequency (between 3 and 7 times per week) and duration of training (between 20 and 60 min per session). For aerobic exercise training only continuous training methods were applied. We have developed a new interval training method which allows intense exercise stimuli on peripheral muscles with minimal cardiac strain. After only three weeks of training, the improvement in aerobic capacity was similar to that reported after longer training periods using continuous methods. To determine work rate for work phases of interval training, a special steep ramp test was developed. By analysis of acute physical responses to this testing procedure and to the interval training, both were proven to be tolerable in CHF patients, even if their ejection fraction is as low as 13%, or peak cardiac index not greater than 1.6 l/m2/min, and peak VO2 less than 8.5 ml/kg/min.
    Notes: Zusammenfassung Bislang existieren keine standardisierten Richtlinien zur Methodik eines körperlichen Trainings für Patienten mit schwerer chronischer Herzinsuffizienz. Patienten, die in der Vergangenheit in Trainingsstudien involviert wurden, zeigen eine große Variabilität der kardialen und funktionellen Einschränkungen, bei mittleren Werten der Ejektionsfraktion zwischen 18 und 35% und der peak VO2 zwischen 12,2 und 25,4 ml/kg/min. Zur Bestimmung der Trainingsbelastung wurde eine VO2 zwischen 40 und 70% der peak VO2 und/oder eine Herzfrequenz zwischen 60 und 80% der maximalen Herzfrequenz gewählt. Ferner variierten die Häufigkeit (zwischen 3- und 7x pro Woche) und die Dauer des Trainings (zwischen 20 und 60 min/Trainingseinheit) stark. Das Ausdauertraining wurde ausschließlich in der kontinuierlichen Dauermethode angewandt. Wir entwickelten eine neue Intervall-Trainingsmethode, die intensive Belastungsreize auf die periphere Muskulatur erlaubt, die kardiale Belastung jedoch gering hält. Nach nur 3 Wochen dieses Intervalltrainings zeigte sich die Verbesserung der aeroben Kapazität in einer Größenordnung, wie sie erst nach längeren Trainingsphasen bei Anwendung der Dauertrainingsmethode berichtet wurde. Zur Bestimmung der Belastung für die Belastungsphasen des Intervalltrainings wurde ein spezifischer steiler Rampentest entwickelt. Eine Analyse der akuten körperlichen Reaktionen während des steilen Rampentests und während des Intervalltrainings ergab, daß beide Belastungsformen selbst für solche Patienten tolerabel waren, die eine Ejektionsfraktion von nur 13%, einen maximalen Herzindex von nicht mehr als 1,6 l/m2/min oder eine peak VO2 von lediglich 8,5 ml/kg/min aufwiesen.
    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...