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A comparison between the automatized impedance cardiography and pulsed-wave Doppler echocardiography methods for measurements of stroke volume [SV] and systolic time intervals [STI]

100%

Cybulski G., Miskiewicz Z., Szulc J., Torbicki A., Pasierski T.

Journal of Physiology and Pharmacology

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1993

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tom 44

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nr 3

2

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

84%

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.

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Repetitive apneas reduce nonlinear dynamical complexity of the human cardiovascular control system

84%

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

4

The influence of endurance training on the transient haemodynamic response to orthostatic manoeuvre

84%

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

5

Cardiovascular, metabolic and plasma catecholamine responses to passive and active exercises

67%

Krzeminski K., Kruk B., Nazar K., Ziemba A. W., Cybulski G., Niewiadomski W.

Journal of Physiology and Pharmacology

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2000

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tom 51

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nr 2

6

Effect of 6-week endurance training on hemodynamic and neurohormonal responses to lower body negative pressure (LBNP) in healthy young men

67%

Nazar K., Gasiorowska A., Mikulski T., Cybulski G., Niewiadomski W., Smorawinski J., Krzeminski K., Ziemba A. W., Dorsz A., Kaciuba-Uscilko H.

Journal of Physiology and Pharmacology

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2006

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tom 57

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nr 2

Endurance training is considered as a factor impairing orthostatic tolerance although an improvement and lack of effect have been also reported. The mechanisms of the changes and their relation to initial tolerance of orthostasis are not clear. In the present study, effect of moderate running training on hemodynamic and neurohormonal changes during LBNP, a laboratory test simulating orthostasis, was investigated in subjects with high (HT) and low (LT) tolerance of LBNP. Twenty four male, healthy subjects were submitted to graded LBNP (-15, -30 and -50 mmHg) before and after training. During each test heart rate (HR), stroke volume (SV) and blood pressure, plasma catecholamines, ACTH, adrenomedullin, atrial natriuretic peptide, and renin activity were determined. Basing on initial test, 13 subjects who withstood LBNP at -50 mmHg for 10 min were allocated into HT group and 11 subjects who earlier showed presyncopal symptoms to LT group. Training improved LBNP tolerance in six LT subjects. This was associated with attenuated rate of HR increase and SV decline (before training, at -30 mmHg DHR was 21 ± 4 beats/min and SV – -36± 8 ml while after training the respective values were 8 ± 4 beats/min and -11± 6 ml). No differences in hemodynamic response were found in HT subjects and those from LT group whose LBNP tolerance was unchanged. In neither group training affected neurohormonal changes except inhibition of plasma ACTH rise in subjects with improvement of LBNP tolerance. It is concluded that some subjects with low orthostatic tolerance may benefit from moderate training due to improvement of cardiac function regulation.

Ograniczanie wyników

5 Journal of Physiology and Pharmacology

1 Journal of Physiology and Pharmacology. Supplement

4 Cybulski G.

3 Krzeminski K.

3 Nazar K.

3 Niewiadomski W.

2 Ziemba A. W.

1 Belkania G. S.

1 Dorsz A.

1 Gasiorowska A.

1 Kaciuba-Uscilko H.

1 Kruk B.

1 Mikulski T.

1 Miskiewicz Z.

1 Pasierski T.

1 Puchalska L.

1 Smietanowski M.

1 Smorawinski J.

1 Szulc J.

1 Torbicki A.

1 Trzebski A.

1 Zebrowski J.

2 2006

1 2001

1 2000

1 1999

1 1993

A comparison between the automatized impedance cardiography and pulsed-wave Doppler echocardiography methods for measurements of stroke volume [SV] and systolic time intervals [STI]

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

Repetitive apneas reduce nonlinear dynamical complexity of the human cardiovascular control system

The influence of endurance training on the transient haemodynamic response to orthostatic manoeuvre

Cardiovascular, metabolic and plasma catecholamine responses to passive and active exercises

Effect of 6-week endurance training on hemodynamic and neurohormonal responses to lower body negative pressure (LBNP) in healthy young men