Results 221 to 230 of about 17,476 (253)

[Ventilatory response to hypercapnia during head-down tilt].

Rossiiskii fiziologicheskii zhurnal imeni I.M. Sechenova, 2011
The effect of hypercapnic ventilatory response was examined in anaesthetized spontaneously breathing rats by using rebreathing techniques both at supine and -30 degrees head-down tilt positions. No significant differences were found in the minute ventilation response between the supine and head-down positions during hypercapnic stimulations.
Zh A, Donina, N P, Aleksandrova
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Reduced orthostatic tolerance following 4 h head-down tilt

European Journal of Applied Physiology and Occupational Physiology, 1991
The cardiovascular responses to a 10-min 1.22 rad (70 degrees) head-up tilt orthostatic tolerance test (OST) was observed in eight healthy men following each of a 5-min supine baseline (control), 4 h of 0.1 rad (6 degrees) head-down tilt (HDT), or 4 h 0.52 rad (30 degrees) head-up tilt (HUT).
G C, Butler, H C, Xing, D R, Northey, R L, Hughson   +3 more
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Development of osteoporosis in primates in hypokinesia with head-down tilt.

Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology, 1998
It has been shown earlier that 7-19 day exposure of monkeys to hypokinesia with head-down tilt (HDT) produces osteopenia in their load-bearing bones. The present work continued the investigations of osteopenia dynamics in monkeys which had been under the HDT conditions for 15 and 30 days.
A S, Kaplansky, G N, Durnova
openaire   +1 more source

[Head-down tilt hypokinesia in monkeys: a morphological study].

Kosmicheskaia biologiia i aviakosmicheskaia meditsina, 1985
Morphological examinations of rhesus monkeys (Macaca mulatta) exposed to head-down tilt for 7 and 19 days are summarized. The major changes detected in various systems, organs and tissues are described. The changes are thought to be of different origin and caused by blood redistribution, hypokinesia per se and concomitant stress.
A S, Kaplanskiĭ, E A, Savina, P B, Kazakova, I P, Khoroshilova-Maslova, G M, Kharin   +4 more
openaire   +1 more source

Effect of head-down tilt bedrest (10 days) on lymphocyte reactivity.

Acta physiologica Scandinavica. Supplementum, 1992
Immunological responses of six healthy males to 10 days of head-down tilt bedrest (HDT) were assessed. Lymphocyte responsiveness was severely reduced immediately before, during, and immediately after the HDT, even though the lymphocyte numbers did not change. By contrast, delayed-type hypersensitivity was not affected. No dramatic changes were found in
Gmünder, F. K., Baisch, F., Bechler, B., Cogoli, A., Cogoli, M., Joller, P. W., Maaß, H., Müller, J., Ziegler, W. H.   +8 more
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Effects of short time −30° head-down tilt on time perception

Perception
Exposure to microgravity induces abnormal experiences that may affect the perception of time. Head-down tilts (HDTs) are commonly used to investigate the effects of weightlessness. A −30° HDT is considered an appropriate model to simulate the acute phase of microgravity exposure.
Weicong Ren, Le Liu, Jin Liang, Pan Zhang, Di Wu, Zhijie Zhang   +5 more
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Usefulness and limitations of head-down tilt metho...

56th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law, 2005
Masao Yamasaki, Akihiro Hazama, Yahiro Netsu, Humihiko Yoshikawa, Kaori Kamijo, Tsuyoshi Shimizu   +5 more
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VENTILATORY DYNAMICS IN RESPONSE TO HEAD DOWN TILT

Medicine & Science in Sports & Exercise, 1987
G. Landry, S. K. Powers, M. K. Stuart
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Response of adrenergic receptors to 10 days head-down tilt bedrest.

Acta physiologica Scandinavica. Supplementum, 1992
Adrenergic receptor responses to 10 days head-down tilt (HDT) bed-rest were measured in six healthy young males. The densities of alpha 2-receptors on platelets, beta 2-receptors on lymphocytes, and the responsiveness of beta 2-receptors to isoproterenol stimulation were assessed, as were the urinary catecholamine excretion rates.
Maass, H., Transmontano, J., Baisch, F.
openaire   +2 more sources

[Physiology of head-down tilting].

Kosmicheskaia biologiia i aviakosmicheskaia meditsina, 1977
K L, Geĭkhman, M R, Mogendovich
openaire   +1 more source