title: Vital capacity, respiratory muscle strength, and pulmonary gas exchange during long-duration exposure to microgravity.
abstract: Extended exposure to microgravity (microG) is known to reduce strength in weight-bearing muscles and was also reported to reduce respiratory muscle strength. Short- duration exposure to microG reduces vital capacity (VC), a surrogate measure for respiratory muscle strength, for the first few days, with little change in O2 uptake, ventilation, or end-tidal partial pressures. Accordingly we measured VC, maximum inspiratory and expiratory pressures, and indexes of pulmonary gas exchange in 10 normal subjects (9 men, 1 woman, 39-52 yr) who lived on the International Space Station for 130-196 days in a normoxic, normobaric atmosphere. Subjects were studied four times in the standing and supine postures preflight at sea level at 1 G, approximately monthly in microG, and multiple times postflight. VC in microG was essentially unchanged compared with preflight standing [5.28 +/- 0.08 liters (mean +/- SE), n = 187; 5.24 +/- 0.09, n = 117, respectively; P = 0.03] and considerably greater than that measured supine in 1G (4.96 +/- 0.10, n = 114, P < 0.001). There was a trend for VC to decrease after the first 2 mo of microG, but there were no changes postflight. Maximum respiratory pressures in microG were generally intermediate to those standing and supine in 1G, and importantly they showed no decrease with time spent in microG. O2 uptake and CO2 production were reduced (approximately 12%) in extended microG, but inhomogeneity in the lung was not different compared with short-duration exposure to microG. The results show that VC is essentially unchanged and respiratory muscle strength is maintained during extended exposure to microG, and metabolic rate is reduced.
authors.affiliation: Div. of Physiology, Dept. of Medicine, Univ. of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0931, USA. kprisk@ucsd.edu
authors.forename: G Kim
authors.initials: GK
authors.lastname: Prisk
authors.forename: Janelle M
authors.initials: JM
authors.lastname: Fine
authors.forename: Trevor K
authors.initials: TK
authors.lastname: Cooper
authors.forename: John B
authors.initials: JB
authors.lastname: West
mesh_terms: D000328:Adult; D002245:Carbon Dioxide / Q000378:metabolism; D045853:Exhalation / Q000502:physiology; D005260:Female; D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D001239:Inhalation / Q000502:physiology; D008297:Male; D008875:Middle Aged; D009133:Muscular Atrophy / Q000503:physiopathology; D010101:Oxygen Consumption / Q000502:physiology; D011659:Pulmonary Gas Exchange / Q000502:physiology*; D012132:Respiratory Muscles / Q000502:physiology*; D013026:Space Flight; D013997:Time Factors; D014797:Vital Capacity / Q000502:physiology*; D014893:Weightlessness
chemical_list: D002245:Carbon Dioxide