Belte r r a Cor p or at ion S afety M an ual D oc I D C H S M BE L 2 0 1 7 Pa g e 2 68 of 53 8 F oll owing fa c tors shoul d be c onsi de r e d whe n a sse ssi ng e mpl o y e e fa ti g ue How man y hour s did t he e mpl o y e e wor k in t he p a st we e k W ha t i s the pa tt e rn of hour s wor ke d in t he p a st we e k Do e nvironmen tal f a c tors pose a n a ddit ional load Doe s the e mpl o y e e s c on dit ion m a tch the menta l ph y sica l a nd e mot ional de mands of the w o rk W ha t i s the ph y si c a l i nte nsit y of w ork Doe s the e mpl o y e e s ph y sica l fit ne ss m a tch the w ork d e mands I s the e mpl o y e e suf fe rin g fr om ac ute sle e p loss Doe s the e mpl o y e e h a ve a slee p de bt W ha t eve nts ar e c urr e ntl y goin g on a w a y fr om w ork I s the e mpl o y e e e x pe rie nc in g li fe str e ssors How we ll ha s thi s e mpl oy e e c op e d in t he pa st Doe s the e mpl o y e e ge t s uppor t at wor k a nd a t hom e I s the e mpl o y e e r e quire d to wor k a t a tim e out of s y n c with t he wa kin g c y c l e of the e mpl o y e e s c irc a dian rh y thm C i rc ad i an Rh yt hm s v i r t ua l l y ev e ry f u nc t i o n of t h e bo dy s l ee p w ake f ul nes s an d al e rt n es s f or ex am p l e I s t i m ed acc ord i ng t o a day ni g ht c y cl e S uch cy c l es appro xi m a t el y 23 25 hou rs l ong are k now n as c i rc adi a n rh yt hm s Alt ho ugh c i rc adi a n rhy t hm s ar e i n f l u enc ed by e xt er na l cue s l i ke s unr i se a nd sun se t i t i s bas i ca l l y c o nt r ol l ed by biol ogi cal cl o ck s l oc at e d i n t he br ai n I nd i v i dua l s f u nct i on be st w h en they fol lo w their body s natural patt e rn of slee p w ak e ful ne ss and al e rt 60 E FF E CTS OF F ATI GUE AN D TH E IR R E L ATIO NSH IP AT WO RK F a ti g ue c a nnot be mea s ure d I t i s di ff icult t o se pa ra te the e ff e c ts of lon g wor king hou rs or lac k o f slee p to an y c ha n g e s in a c c ide nt or inj ur y r a tes How e ve r studies r e port t he e ff e c ts of f a ti g u e a s R e duc e d de c isi on making a bil it y R e duc e d a bil it y to do c o mpl e x planning R e duc e d c omm unica ti on skil ls R e duc e d pro du c ti vit y p e rf orma n c e R e duc e d a tt e nti on a nd vi g il a nc e R e duc e d a bil it y to h a ndle stre ss on t he job R e duc e d r e a c ti on ti me both i n spe e d a nd thoug h t L oss of me mo r y or the a bil it y to r e c a ll de t a il s F a il ure to r e spond t o c ha ng e s in s ur round ing s o r inf orma ti on pr ovided Una ble to st a y a w a ke e g f a ll ing a sl e e p while o pe ra ti n g mac hine r y or dr i ving a v e hicle I n c re a se d tend e nc y fo r r i sk taking I n c re a se d fo r g e tfulne ss I n c re a se d e rr ors in jud gment Doc u m e n t Identif icat ion S E L 037 P age Nu m b e r 4 of 7 Doc u m e n t C r e ation Dat e J a nua r y 31 2016 Im p le m e n tat ion Dat e Apr il 8 2016 I n c re a se d si c k ti me a bs e ntee ism ra te of turnov e r I n c re a se d medic a l costs a nd