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  • 1
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    Space motion sickness (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Space motion sickness clinical characteristics, time course, prediction of susceptibility, and effectiveness of countermeasures were evaluated. Although there is wide individual variability, there appear to be typical patterns of symptom development. The duration of symptoms ranges from several hours to four days with the majority of individuals being symptom free by the end of third day. The etiology of this malady remains uncertain but evidence points to reinterpretation of otolith inputs as being a key factor in the response of the neurovestibular system. Prediction of susceptibility and severity remains unsatisfactory. Countermeasures tried include medications, preflight adaptation, and autogenic feedback training. No countermeasure is entirely successful in eliminating or alleviating symptoms.
    Keywords: AEROSPACE MEDICINE
    Type: ESA Proceedings of 2nd International Conference on Space Physiology; p 137-142
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Comparison of aerobic fitness and space motion sickness during the Shuttle program (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Space motion sickness (SMS) is an important problem for short-duration space flight; 71 percent of STS crewmembers develop SMS symptoms. The search for effective countermeasures and factors that correlate with sensitivity has been extensive. Recently, several investigators have linked aerobic fitness with motion sickness sensitivity in the 1-G or high-G environment. This paper compares the aerobic fitness of 125 Shuttle crewmembers with their SMS symptom category. Aerobic fitness data were obtained from the exercise tolerance test conducted nearest the time of launch. SMS data were derived from the medical debrief summaries. Mean maximum oxygen consumption values for crewmembers in four SMS categories (none, mild, moderate, severe) were 44.55, 44.08, 46.5, and 44.24 ml/kg per min, respectively. Scattergrams with linear regression analysis, comparing aerobic fitness and SMS symptom classification are presented. Correlation coefficients comparing SMS categories vs. aerobic fitness for men and women reveal no definite relationship between the two factors.
    Keywords: AEROSPACE MEDICINE
    Type: Aviation, Space, and Environmental Medicine (ISSN 0095-6562); 59; 448-451
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    NASA TECHNICAL REPORTS
  • 3
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    Space motion sickness during 24 flights of the Space Shuttle (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: This paper examines the incidence and the severity of space motion sickness (SMS) during 24 flights of the Space Shuttle, using a standardized questionnaire administered to all crewmembers postflight. It was found that, for 85 crewmembers, the incidence of SMS during a first Shuttle flight was 67 percent, of which 30 percent were mild cases, 24 percent moderate, and 13 percent severe. Crewmembers with a second flight showed a reduction in SMS incidence, but the change was not significant compared with the first flight. It is suggested that variability in crewmember training and flight experience may explain some of the differences observed.
    Keywords: AEROSPACE MEDICINE
    Type: Aviation, Space, and Environmental Medicine (ISSN 0095-6562); 59; 1185-118
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  • 4
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    A model for plasma volume changes during short duration spaceflight (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: It is well established that plasma volume decreases during spaceflight and simulated weightlessness (bedrest). The decrement in plasma volume is thought to contribute to the orthostatic intolerance that has been observed in some crew members following spaceflight. To date, no studies have evaluated the effectiveness of fluid countermeasures of varying osmolality in the restoration of plasma volume and orthostatic tolerance in a controlled study. The overall objectives of this project were to: (1) provide a model that would rapidly and safely produce a fluid loss comparable to that which occurs during short duration spaceflight; and (2) design a study that would determine the optimal drink solution to restore orthostatic tolerance and describe the mechanism(s) whereby orthostatic tolerance is restored. In summary, Lasix can be used as a way of simulating the plasma volume changes that occur during short duration spaceflight. The total loss of plasma is comparable to spaceflight. Lasix is fast acting, and has relatively few side effects. The present design for evaluating the optimal fluid countermeasures will have important implications in restoring orthostatic tolerance and function in the latter stages of spaceflight when it is essential for safe operation of the spacecraft.
    Keywords: AEROSPACE MEDICINE
    Type: NASA, Lyndon B.; NASA, Lyndon B. John
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  • 5
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    Effect of fluid countermeasures of varying osmolarity on cardiovascular responses to orthostatic stress (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Current operational procedures for shuttle crewmembers include the ingestion of a fluid countermeasure approximately 2 hours before reentry into the earth's gravitational field. The ingestion of the fluid countermeasure is thought to restore plasma volume and improve orthostatic responses upon reentry. The present countermeasure consists of ingesting salt tablets and water to achieve an isotonic solution. It has yet to be determined whether this is the optimal drink to restore orthostatic tolerance. It is also not known whether the drink solution is effective in increasing plasma volume. The purpose here is to evaluate the effectiveness of drink solutions of different osmolarity on restoring plasma volume and orthostatic responses. A hypertonic drink solution was more effective in restoring plasma volume after dehydration than an isotonic solution. However, there were no differences in their effects on an orthostatic challenge. These data suggest that the plasma volume differences produced in this study were not sufficient to produce differences in the cardiovascular responses to an orthostatic challenge, or there are other changes that occur during space flight that are more important in determining orthostatic intolerance.
    Keywords: AEROSPACE MEDICINE
    Type: Texas A&M Univ., NASA(ASEE Summer Faculty Fellowship Program, 1989, Volume 1; 14 p
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  • 6
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    Analysis of sleep on Shuttle missions (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The sleep patterns of 58 Space Shuttle crew members are analyzed statistically on the basis of debriefing forms filled out within 3 days postflight. The data are compiled in a table, and photographs of typical sleep conditions on the Shuttle are provided. It is found that sleep disruption is relatively common on Shuttle missions, especially on the first and last days. Sleep medication was used by 19.4 percent of crew on single-shift flights and 50 percent of crew on dual-shift flights.
    Keywords: AEROSPACE MEDICINE
    Type: Aviation, Space, and Environmental Medicine (ISSN 0095-6562); 59; 1094-109
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  • 7
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    Bedrest in healthy women: Effects of menstrual function and oral contraceptives (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: With the development of the space shuttle program, space flight for the first time is available to individuals who have not been specially selected and trained to be astronauts. In addition, women are being actively recruited into the space program, both as mission specialists and as career astronauts. One purpose of this project was to examine some of the physiological responses of women to a simulated weightlessness program (12 day horizontal bedrest), to compare their responses to those reported in men during similar programs, and to test whether menstrual function might alter some of the physiological changes which occur during bedrest, specifically changes in the plasma volume, exercise tolerance, and venous compliance before and after bedrest.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-171946 , NAS 1.26:171946
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  • 8
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    Changes in plasma volume during bed rest - Effects of menstrual cycle and estrogen administration (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The effect of increased blood estrogen concentration, caused either during normal menstrual cycles or by exogenous administration of premarin, on the bed-rest (BR) induced decrease in plasma volume (PV) was investigated. In women who underwent duplicate 11-day BR without estrogen supplementation, the PV was found to decrease significantly, during the first 5 days of BR, to a lower level at which it remained for the rest of the BR period. In women who began BR in the periovulatory stage of the menstrual cycle, the loss of PV was delayed, while women who began BR during other stages of the cycle exhibited the usual trend of the PV decrease during the BR. In women who underwent a single 12-day BR period while taking premarin (1.25 mg/day), PV was found to decrease during the first 4-5 days of BR, but then returned toward the pre-BR level during the remainder of the BR, indicating that estrogens have a role in stabilizing body fluid volume.
    Keywords: AEROSPACE MEDICINE
    Type: Journal of Applied Physiology (ISSN 0161-7567); 65; 525-533
    Format: text
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