Circadian Rhythm Living organisms on this planet have adapted to the daily rotation of the earth on its axis. By means of "endogenous circadian clocks" that can be synchronized to the daily and seasonal changes in external time cues, most notably light and temperature. Most people anticipate environmental transitions, perform activities at biologically advantageous times during the day, and undergo characteristic seasonal responses. The effects of transmeridian flight and shift work are stark reminders that …showed first 75 words of 2045 total…

…showed last 75 words of 2045 total…Weldon, K. J., Smith, R. M., Gregory, K. G., Miller, D. L., Gander, P. H., Lebacqz, J. V. (1994). Fatigue Countermeasures: Alertness Management in Flight Operations. Southern California Safety Institute Proceedings, Long Beach, 1994, 190-197 8) Mann, Michael B., Deputy Associate Administrator, Aero-Space Technology, National Aeronautics and Space Administration. TESTIMONY: PILOT FATIGUE (106-33) HEARINGS BEFORE THE SUBCOMMITTEE ON AVIATION OF THE COMMITTEE ON TRANSPORTATION AND INFRASTRUCTURE HOUSE OF REPRESENTATIVES ONE HUNDRED SIXTH CONGRESS FIRST SESSION AUGUST 3 and SEPTEMBER 15, 1999