114 research outputs found
Exercise in pregnancy : an experimental study of maternal and fetal responses to exercise in sheep
Pregnant women in the western world usually reduce their physical activity as
term approaches. However, in recent years increasing numbers of women also
voluntarily engage in relatively strenuous exercise during pregnancy. Both
pregnancy and physical activity increase the body's metabolic demands, but the
physiologic adaptations to these combined demands are only partially understood.
On the one hand, one would expect adverse maternal or fetal effects because of the
seemingly conflicting demands of the acutely exercising muscles and of the
pregnant uterus. On the other hand, however, nature presents several examples in
which strenuous physical activity during pregnancy co-exists with a favorable
outcome of pregnancy. Therefore, further investigation of the adaptations to
exercise in pregnant individuals is important from the viewpoint of physiology as
well as of obstetrics.
The study of the physiologic effects of exercise during pregnancy is complicated
for several reasons. These include 1) large baseline changes within each individual
during the course of gestation, 2) wide variation in baseline values between individuals
(e.g., physical condition), 3) many differences in exercise load and/or
experimental design between studies, 4) wide normal variation in fetal outcome,
5) possible interference off ear and other "stresses", 6) relative inaccessability of the
fetus, 7) ethical and legal problems relative to studies in humans, and 8) profound
species differences. Many aspects of fetal physiology can only be investigated with
the use of invasive techniques. Obviously their use must be restricted to animal
studies and, consequently, relatively little is known of the human fetus per se.
Although one has to be careful in extrapolating animal data to man, animal studies
provide a powerful tool in improving our understanding of human physiology.
This thesis represents an effort to obtain a better understanding of the
physiologic adaptations to the combined stresses of exercise and pregnancy. It
consists of four chapters. Chapter one extensively reviews the literature, discussing
the physiologic changes which occur both in pregnancy and exercise, as well as the
adaptations to these combined stresses. Rather than to focus on the differences in
experimental design and species we emphasize the common denominator in what is
known and not known about the subject, and point out fertile topics for further
investigation. Chapters two and three present the results of our experimental
studies of acute maternal and fetal responses to exercise in chronically instrumented
sheep. Finally, chapter four deals with the main physiologic changes during
exercise in pregnanc
Private financing of infrastructure. An application to public transport infrastructure
Institute of Transport and Logistics Studies. Faculty of Economics and Business. The University of Sydne
Half-metallic antiferromagnets in thiospinels
We have theoretically designed the half-metallic (HM) antiferromagnets (AFMs)
in thiospinel systems, and , based on the electronic structure
studies in the local-spin-density approximation (LSDA). We have also explored
electronic and magnetic properties of parent spinel compounds of the above
systems; and are found to be HM
ferromagnets in their cubic spinel structures, while is a
ferrimagnetic insulator. We have discussed the feasibility of material
synthesis of HM-AFM thiospinel systems.Comment: 4 pages, 5 figure
Verloskunde anno 2003 : authority based, evidence biased
Contains fulltext :
19290_verlan20.pdf (publisher's version ) (Open Access)20 p
[Participation in sports during pregnancy].,[Participation in sports during pregnancy]
Contains fulltext :
86672.pdf (publisher's version ) (Open Access
Elektronische verloskundige status
Contains fulltext :
86662.pdf (publisher's version ) (Open Access
[Echography in the 1st pregnancy trimester is prognostically valuable].,[Echography in the 1st pregnancy trimester is prognostically valuable]
Contains fulltext :
86674.pdf (publisher's version ) (Open Access
Electronic obstetric record: an efficient application of the hospital information system
Contains fulltext :
86665.pdf (publisher's version ) (Open Access)8th European Health Records Conference, MECC Congress Centre Maastricht, The Netherlands, May 21-24, 199
Elektronische verlokundige status: efficiency-verbetering in de praktijk
Contains fulltext :
86664.pdf (publisher's version ) (Open Access)EMD '9
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