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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 50 (1982), S. 71-78 
    ISSN: 1439-6327
    Keywords: Systolic time intervals ; Age factors ; Noninvasive techniques ; Exertion ; Plethysmography, impedance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Measurements of systolic time intervals were obtained by simultaneous recordings of ECG and first derivative transthoracic electrical impedance curves, at rest in the supine and upright body positions and during exercise while sitting on a bicycle ergometer. The same schedule was applied to 70 normal males divided into 3 groups: 20 boys 11–14 years, 25 yound adults 20–30 years, and 25 middle-aged men 45–55 years. Duration of the preejection period (PEP) was not affected by age at rest; during exercise PEP was found to be slightly shorter (NS) in the middle-aged than in the boys and young adults. Left ventricle ejection time (LVET) showed a slight increase with increasing age at rest, and this difference became more marked during exercise. Thus diastole must be shorter during exercise in the elderly than in the young population. The age-related lengthening of LVET seems more likely to be due to some peripheral factor such as increasing impedance of the vascular bed rather than myocardial changes due to aging.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1439-6327
    Keywords: Coronary risk factors ; Lipoprotein profile ; Trained and untrained adolescents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fifty-five experimental (29 male, 25 female) and 38 control (20 male, 18 female) adolescent subjects participated in this study to investigate the differences in coronary heart disease (CHD) risk factors in groups of trained and untrained adolescents. As expected the trained group (both sexes) had higher maximal aerobic power $$(\dot V_{O_{2 max} } )$$ and lower systolic blood pressure at rest. The level of total cholesterol was the same in both groups, but the levels of high-density lipoprotein and its lipoprotein subfractions apolipoprotein (Apo-A) and Apo-A1 were higher, and low-density lipoprotein, Apo-B and triglycerides were significantly lower in the experimental group. The value of risk factors from the family history was the same in both groups, but the behavioural and physical risk factors such as smoking and percentage of body fat were lower in the trained group. It would appear that the group of adolescents, trained for several years in athletics and swimming, had a more beneficial lipoprotein profile and a lower level of behavioural and physical risk factors than the control group. For methodological reasons it remains an open question whether these profile differences are the consequences of self-selection procedures or the effects of training.
    Type of Medium: Electronic Resource
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