Rm. Baevsky et al., ADAPTIVE RESPONSES OF THE CARDIOVASCULAR-SYSTEM TO PROLONGED SPACEFLIGHT CONDITIONS - ASSESSMENT WITH HOLTER MONITORING, Journal of cardiovascular diagnosis and procedures, 14(2), 1997, pp. 53-57
Citations number
2
Categorie Soggetti
Radiology,Nuclear Medicine & Medical Imaging","Cardiac & Cardiovascular System
This article presents selected findings obtained with Holter monitorin
g from two crew members of the expedition, performed during a 175-day
space mission on board orbital space station ''MIR.'' Using mathematic
al processing of daily cardiointervals files, 5-minute sections of rec
ords were analyzed consecutively. Then, the average daily values of in
dices, the average-per-every-eight-hours values (morning, evening, nig
ht) and mean values per hour were computed. The results of analysis sh
owed that prolonged exposure of man to microgravity conditions leads t
o important functional alteration in human neuroautonomic regulatory m
echanisms. Both crew members had significant increase of heart rate, t
he rise of stress index, the decrease in power of the spectrum in the
range of respiratory sinus arrhythmia. These marked signs of activatio
n of the sympathetic section of the vegetative nervous system showed i
ndividual variations. The analysis of the daily collection of cardioin
tervals with Holter monitoring allows us to understand and forecast th
e functional feasibilities of the human organism under a variety of st
ress conditions associated with acute and chronic microgravity exposur
e.