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Static and dynamic baroreflex perfor...

Moore, Fritz Brinkman.

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Static and dynamic baroreflex performance in individuals under moderate or high average daily workload.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Static and dynamic baroreflex performance in individuals under moderate or high average daily workload./
作者:	Moore, Fritz Brinkman.
面頁冊數:	111 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2726.
Contained By:	Dissertation Abstracts International65-06B.
標題:	Biology, Animal Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3137578
ISBN:	049684752X

Static and dynamic baroreflex performance in individuals under moderate or high average daily workload.
Moore, Fritz Brinkman.

Static and dynamic baroreflex performance in individuals under moderate or high average daily workload. - 111 p.

Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2726.

Thesis (Ph.D.)--University of California, Davis, 2004.

The baroreflex controls heart and vasculature and maintains a steady state, AP that oscillates around a set point. The intent of this study was to investigate the role of cardiovascular organ kinetics on AP and orthostatic tolerance.

ISBN: 049684752XSubjects--Topical Terms:

1017835
Biology, Animal Physiology.

Static and dynamic baroreflex performance in individuals under moderate or high average daily workload.
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245 1 0 $a Static and dynamic baroreflex performance in individuals under moderate or high average daily workload.
300 $a 111 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2726.
500 $a Adviser: Jack Goldberg.
502 $a Thesis (Ph.D.)--University of California, Davis, 2004.
520 $a The baroreflex controls heart and vasculature and maintains a steady state, AP that oscillates around a set point. The intent of this study was to investigate the role of cardiovascular organ kinetics on AP and orthostatic tolerance.
520 $a I developed a device to sinusoidally change lower body negative pressure (LBNP) at frequencies between 0 and 0.15 Hz and changes in heart rate (HR), AP, stroke volume (SV), total peripheral resistance (TPR) and calf circumference (CC) were measured. In addition, a high load orthostatic tolerance (OT) test was developed and was compared to a traditional low load test of OT. Measurements of time to presyncope and hematocrit (Hct) verified that the new test caused presyncope faster and with less change in Hct. The high load test is thought to provide a test, which minimizes the confounding factors of fluid shifts.
520 $a Long-distance bicyclists were compared to moderately trained subjects to discern differences in AP stability and link these differences with variations in the kinetics of baroreflex organ control. I tested the hypothesis that highly trained subjects would have decreased OT as a result of less stable AP and that the differences would correspond to variations in dynamic cardiovascular responses. Testing showed cyclists and moderately trained individuals in fact had equivalent OT and AP. The cyclists did however change Hct more rapidly during the OT test. Additionally the cyclists showed an altered reflex regulation of TPR during oscillatory LBNP indicated by a significantly greater phase lag between CC and TPR. The cyclists showed a smaller fluid shift (measured by CC) during oscillating LBNP suggesting a possible link between TPR phasing and fluid redistributions resulting from orthostatic stress. This study, together with previous studies in the field, suggests that in the design of experiments on highly trained athletes (long-distance bicyclists and Nordic skiers) special attention should be given to characterization of the control group---most UCD students are moderately trained, whereas control subjects drawn from other populations may be more sedentary.
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792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3137578