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Titolo:
Head-down bed rest alters sympathetic and cardiovascular responses to mental stress
Autore:
Kamiya, A; Iwase, S; Michikami, D; Fu, Q; Mano, T;
Indirizzi:
Nagoya Univ, Environm Med Res Inst, Dept Autonom Neurosci, Chikusa Ku, Nagoya, Aichi 4648601, Japan Nagoya Univ Nagoya Aichi Japan 4648601 a Ku, Nagoya, Aichi 4648601, Japan
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY
fascicolo: 2, volume: 279, anno: 2000,
pagine: R440 - R447
SICI:
0363-6119(200008)279:2<R440:HBRASA>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUDDEN CARDIAC DEATH; ORTHOSTATIC INTOLERANCE; NOREPINEPHRINE RELEASE; NERVE ACTIVITY; NITRIC-OXIDE; BLOOD-FLOW; HUMANS; SPACEFLIGHT; MUSCLE; CHALLENGE;
Keywords:
muscle sympathetic nerve activity; blood flow; vascular resistance; microgravity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Kamiya, A Nagoya Univ, Environm Med Res Inst, Dept Autonom Neurosci, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648601, Japan Nagoya Univ Furo Cho Nagoya Aichi Japan 4648601 i 4648601, Japan
Citazione:
A. Kamiya et al., "Head-down bed rest alters sympathetic and cardiovascular responses to mental stress", AM J P-REG, 279(2), 2000, pp. R440-R447

Abstract

Astronauts usually work under much mental stress. However, it is unclear how and whether or not an exposure to microgravity affects physiological response to mental stress in humans. To examine effects of microgravity on vasomotor sympathetic and peripheral vasodilator responses to mental stress, we performed 10 min of mental arithmetic (MA) before and after 14 days of 6 degrees head-down bed rest (HDBR), a ground-based simulation of spaceflight. Total muscle sympathetic nerve activity (MSNA, measured by microneurography) slightly increased during MA before HDBR, and this increase was augmented after HDBR. Calf blood flow (measured by venous occlusion plethysmography) increased and calf vascular resistance (calculated by dividing mean blood pressure by calf blood flow) decreased during MA before HDBR, but these responses were abolished after HDBR. Increases in heart rate and mean blood pressure during MA were not different between before and after HDBR. These findings suggest that HDBR augmented vasomotor sympathoexcitation but attenuated vasodilatation in the calf muscle in response to mental stress.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:14:30