submission - Independent Pilots Association

irnpaircd by apprcx:raarely 6 87ó and l1.T/o Grún¡ner¡cal rcasoning Eccr¡ñL-w onc rcspcnse
latcacy, respcctiveh | 2.-7% and 20 57o (vigilancr accuç¡ct and response latener.. respccrryelv)
ot 2l.tyo (rækingi Overall. the decli¡e i¡ mcar: reìative pcrfornancc ra¡gcd from
aPproximalely 0.29%to 2.68% p:r 0.01o,ó 8.4,C. These resuhs a¡e consisæ¡¡ ç'irh previors
findings that suggel that alcohol produces a Cose-dependcor decrcasc in aeuobehariou¡al
pet'ormancc @illings a al.,l99l).
In contrasl, næan rclaive pcrformance in tbe susta¡De¡l *¡keñ¡lness cond.iúoo showed th¡ee
distinct phases. Ncr¡robehavior.ual pcrformance rcrnained ar a reladvel¡r stable lcvel during thc
period uhich coi¡cidcd with the nonn¡l *nking day (0 to 17 hous). ln rhe second phase.
performance dccrcascd hnearly, with poorest pcrfornra¡cc geærally æcgrring aie¡ 25 ¡o 2?
hours of wakefulncss h q'as obscrred that mea¡r rclative perfomrancc i¡creasei agarn añcr 26 ro
28 hou¡s of wakeñ¡h.ess presumably ref,:.-ting eiù¡:r the well reporte¿ gi¡cqJran va¡iation i¡
neruobehaviour¿l p3rforma¡ce (Folk¡¡d a¡d Tonersdcll. 1993) or an enti of tesOag scssion effea.
The linear decrease n performanc¿ cbecrved for fou¡ of the melsu¡es rn this s:uCy is consifent
-
r+ith previo¡rs studics docu.arc¡ri.g ner.ÃoÞhsvior:nl perrbnnance decrea_ses tbr pencds oi
sustaincd ç'akeñ¡Jnes< ¡etween l2EDd E6 bou¡s Oiodc er al. 1992, Sro¡er sr ai.l9t9; Ficrrca e;
a/. 1968). Bet*een tbc seventeentb a¡d lwentv-seventh horrrs of wakfuln€ss, mcE¡l rclar¡r,e
performancc sigrrificurtiy decreased EL a rale of approúmetcll' 2.61.,'o (gt-a¡'.roancål rcasoning
response latcnc)'), 0 6l and l.9t% (vigi¡aæc accuracy anC respoose laæncy, respcctivel¡-) ol
3.36% (uacking) per horu.