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
URL:
http://dx.doi.org/10.1007/BF00952245
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