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  • 1
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    Diurnal rhythms of visual accommodation and blink responses - Implication for flight-deck visual standards (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Possible 24-h variations in accommodation responses were investigated. A recently developed servo-controlled optometer and focus stimulator were used to obtain monocular accommodation response data on four college-age subjects. No 24-h rhythm in accommodation was shown. Heart rate and blink rate also were measured and periodicity analysis showed a mean 24-h rhythm for both; however, blink rate periodograms were significant for only two of the four subjects. Thus, with the qualifications that college students were tested instead of pilots and that they performed monocular laboratory tasks instead of binocular flight-deck tasks, it is concluded that 24-h rhythms in accommodation responses need not be considered in setting visual standards for flight-deck tasks.
    Keywords: AEROSPACE MEDICINE
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    NASA TECHNICAL REPORTS
  • 2
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    Cardiovascular responses of men and women to lower body negative pressure (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Changes in blood flow and blood redistribution were measured by impedance plethysmography in the pelvic and leg regions of six male and four female subjects during three 5-min exposures to -20, -40, and -60 mm Hg lower body negative pressure (LBNP). Female subjects demonstrated significantly higher mean heart rate and lower leg blood flow indices than the male subjects during the recumbent control periods. Men had slightly higher mean resting systolic and diastolic blood pressures and higher mean control pelvic blood indices. Women demonstrated significantly less blood pooling in the legs and slightly less in the pelvic region than the men. All of the 18 tests with male subjects at -60 mm Hg were completed without initial signs of syncope, while only two of the tests with women were completed successfully without the subject exhibiting presyncopal conditions. Results indicate that impedance plethysmography can be used to measure segmental cardiovascular responses during LBNP and that females may be less tolerant to -60 mm Hg LBNP than males.
    Keywords: AEROSPACE MEDICINE
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  • 3
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    Effect of ambient temperature on the thermal profile of the human forearm, hand, and fingers (1976)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Forearm, hand, and finger skin temperatures were measured on the right and left sides of seven resting men. The purpose was to determine the bilateral symmetry of these segmental temperature profiles at ambient temperatures from 10 to 45 C. Thermistors placed on the right and left forearms, hands, and index fingers were used to monitor the subjects until equilibration was reached at each ambient temperature. Additionally, thermal profiles of both hands were measured with copper-constantan thermocouples. During one experimental condition (23 C ambient), rectal, ear canal, and 24 skin temperatures were measured on each subject. Average body and average skin temperatures are given for each subject at the 23 C ambient condition. Detailed thermal profiles are also presented for the dorsal, ventral, and circumferential left forearm, hand, and finger skin temperatures at 23 C ambient. No significant differences were found between the mean skin temperatures of the right and left contralateral segments at any of the selected ambient temperatures.
    Keywords: AEROSPACE MEDICINE
    Type: Annals of Biomedical Engineering; 4; 1976
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  • 4
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    Reduction of heat strain in man with head cooling (1973)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Keywords: AEROSPACE MEDICINE
    Type: Life Sci. Publ., Vol. 1; 1 p
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  • 5
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    Long term use of a swallowable temperature transmitter (1973)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Keywords: AEROSPACE MEDICINE
    Type: Life Sci. Publ., Vol. 1; 2 p
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  • 6
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    Variation of forearm, hand, and finger blood flow indices with ambient temperature (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Forearm, hand, and finger blood flow (impedance) changes are measured by impedance rheography on seven healthy male subjects aged 20-35 yr during exposure to ambient temperatures ranging from 10 to 46 C. All observations are made in an environmental chamber at a dew point temperature of 13 + or - 0.25 C. It is shown that impedance rheography is suitable for quantifying peripheral circulatory responses to thermal stress. The measured blood flow indices are found to be consistent with previously reported values for the forearm, hand, and fingers obtained using air or water displacement plethysmography. In particular, the more distal body segments exhibit relatively larger vasomotor responses to changes in ambient temperature than do the more proximal body segments.
    Keywords: AEROSPACE MEDICINE
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  • 7
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    Interactions of hypothalamic thermosensitivity and body size in vertebrates (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: AEROSPACE MEDICINE
    Type: Life Sci. Publ., Vol. 2; 4 p
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  • 8
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    Liquid cooled brassiere and method of diagnosing malignant tumors therewith (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A device for enhancing the detection of malignant tissue in the breasts of a woman was described. A brassiere-like garment which is fitted with a pair of liquid-perfused cooling panels which completely and compliantly cover the breasts and upper torso was studied. The garment is connected by plastic tubing to a liquid cooling system comprising a fluid pump, a solenoid control valve for controlling the flow of fluid to either the cooling unit or the heating unit, a fluid reservoir, a temperature sensor in the reservoir, and a restrictor valve to control the pressure in the garment inlet cooling line.
    Keywords: AEROSPACE MEDICINE
    Format: application/pdf
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