Accession Number:

ADA106379

Title:

Cardiorespiratory Assessment of 24-Hour Crash-Diet Effects on Altitude, +Gz, ad Fatigue Tolerances,

Descriptive Note:

Corporate Author:

FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROMEDICAL INST

Report Date:

1981-02-01

Pagination or Media Count:

23.0

Abstract:

Eleven male surrogates of general aviation pilots, 25-40 years old, were tested for altitude, Gz, and fatigue tolerances with and without previous fasting for 24 h. Testing included 2 min of lower body negative pressure LBNP at -40 torr equivalent to 2Gz after 118 min at 3,810 m chamber altitude and, after returning to ground level pressure, ergometry of 50 watts W for 6 min. The fast had no statistically significant effect on altitude and fatigue tolerances. One subject, who tolerated 2 min of LBNP in the nonfasting condition, lost useful consciousness during this test in the fasting condition. Although the remaining 10 subjects tolerated 2 min of LBNP in both fasting and nonfasting conditions without statistically significant differences in quantitated parameters, 2 of them during fasting manifested symptoms usually associated with impending syncope. Pilots should be informed that a 24-h fast may reduce the margin for safe tolerance of or 2Gz flight maneuvers. Author

Subject Categories:

  • Medicine and Medical Research
  • Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE