title: ECG voltage modifications as response to gravity changes.
abstract: The aim of the study was to analyze ECG (QRS) voltage responses to body fluid shift due to gravity chances. Acute changes in gravity were created by two ways: 1) changes in gravity value during parabolic flights (within 27 subjects 45 ECG have been analyzed); 2) changes in gravity direction due to rotation of the body during postural tests (within 11 subjects 14 ECG have been analyzed). Results and conclusions. Gravity change leads to body fluid shift and changes of intrathoracic organs and tissues electroconduction. It influences on ECG voltage. During parabolic flights in up-right position: R amplitude in Z axis increases in hypergravity (+0.19 mV) and decreases in microgravity (-0.24 mV). During postural tests, R amplitude in Z axis increases in orthostatic position (+0.09 mV) and decreases in antiorthostatic position (-0.025 mV). Changes in QRS voltage during parabolic flights are more important than during postural tests. This could be due to more effective blood redistribution during parabolic flights.
authors.affiliation: Cardiology Research Complex, Moscow, Russia. marinams2002@mail.ru
authors.forename: M
authors.initials: M
authors.lastname: Saltykova
authors.forename: A
authors.initials: A
authors.lastname: Capderou
authors.forename: O
authors.initials: O
authors.lastname: Atkov
authors.forename: V
authors.initials: V
authors.lastname: Gusakov
authors.forename: O
authors.initials: O
authors.lastname: Baillart
authors.forename: G
authors.initials: G
authors.lastname: Konovalov
authors.forename: Yu
authors.initials: Y
authors.lastname: Kataev
authors.forename: L
authors.initials: L
authors.lastname: Voronin
authors.forename: R
authors.initials: R
authors.lastname: Kaspranskiy
authors.forename: V
authors.initials: V
authors.lastname: Morgun
authors.forename: P
authors.initials: P
authors.lastname: Vaida
mesh_terms: D000328:Adult; D004562:Electrocardiography; D005260:Female; D018495:Fluid Shifts / Q000502:physiology*; D006801:Humans; D018471:Hypergravity; D008150:Lower Body Negative Pressure; D008297:Male; D008875:Middle Aged; D011187:Posture / Q000502:physiology; D012399:Rotation; D013026:Space Flight; D016683:Supine Position / Q000502:physiology; D013909:Thorax / Q000098:blood supply / Q000502:physiology; D014893:Weightlessness; D018474:Weightlessness Simulation