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Haemodynamic responses to the dynamic exercise in subjects exposed to different gravitational conditions

100%
Puchalska L., Belkania G. S.
Journal of Physiology and Pharmacology. Supplement
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2006
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tom 57
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nr 11
103-113
Different types of adaptation of the cardiovascular system to the gravitational forces (hypokinetic and hyperkinetic) have been described in the healthy and the sick subjects under resting conditions. The aim of the present study was to elucidate whether haemodynamic responses to the dynamic exercise performed under various gravitational conditions are determined by the type of adaptation of the cardiovascular system to the gravitational forces at rest. The study was performed on 249 healthy men, 20-60 years old. To assess the type of regulation of the cardiovascular system arterial blood pressure (MABP), heart rate (HR), stroke volume (SV), cardiac output (CO), and systolic function (SF) of the heart were determined in each subject at rest in the upright (orthostatic state) and in the supine position. Subsequently, the subjects were performing exercise on a cycloergometer in the sitting and the supine position. Four gradually increasing workloads were applied. Measurements of HR, MABP, SV, CO, and SF were repeated at the end of each workload. SV, CO and SF were determined by means of rheography. The results revealed that in the individuals showing at rest the hypokinetic type of orthostatic cardiovascular adaptation the augmentation of CO during exercise in the sitting position was caused by significant increases of HR and SV. In contrast, the subjects with the hyperkinetic type of orthostatic adaptation the increase in CO during exercise in the sitting position was much smaller and resulted predominantly from acceleration of HR. It is concluded that the cardiovascular adaptation to the dynamic exercise depends not only on the position of the body in which the exercise is performed but it is also determined by the type of adaptation of the cardiovascular system to the gravitational forces at rest. In the sitting position the pumping capacity of the heart is significantly greater in the hypokinetic than in the hyperkinetic type of the cardiovascular regulation; this relationship being reversed during exercise in the horizontal position.
2
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Repetitive apneas reduce nonlinear dynamical complexity of the human cardiovascular control system

100%
Trzebski A., Smietanowski M., Zebrowski J.
Journal of Physiology and Pharmacology
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2001
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tom 52
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nr 1
3
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The influence of endurance training on the transient haemodynamic response to orthostatic manoeuvre

100%
Cybulski G., Krzeminski K., Niewiadomski W., Nazar K.
Journal of Physiology and Pharmacology
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1999
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tom 50
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nr 2
4

Changes of blood flow through the chicken ovary and oviduct after serotonin treatment

80%
Rzasa J., Hrabia A., Paczoska-Eliasiewicz H., Sechman A.
Bulletin of the Veterinary Institute in Puławy
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2008
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tom 52
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nr 2
The effect of serotonin on cardiac output and blood flow through the white ovarian follicles, five yellow preovulatory follicles (F5-F1), and four oviductal parts: infundibulum, magnum, isthmus, and shell gland were measured with ⁸⁶RbCl 1 min and 5 min after serotonin treatment in the domestic hen. In comparison with control hens, serotonin significantly increased cardiac output by 35.8% 5 min after its treatment. Blood flow (ml/min/g tissue) through the white follicles, F5-F4 follicles, and shell gland was significantly decreased (60%, 40.6%-52.1%, and 23.7%, respectively) 1 min after serotonin treatment and was significantly elevated through the white follicles, F3 follicle, and shell gland (187.5%, 36.4%, and 69.7%, respectively) 5 min after its administration. The fact that serotonin present in high concentration in chicken reproductive organs significantly changes blood flow through the ovary and shell gland (uterus) indicates that serotonin by the influence on haemodynamics of blood vessels and in consequence changes of blood flow participates in the processes taking place in the ovary during growth and maturation of the follicles and in the oviduct during formation of the egg and/or oviposition.
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