Document 8QaXvL2kXg35vzM0NYRzyV1y

Industrial Hygiene Digest June, 196S 540 PhysiologicarAsp'ect* of Work Meaeurement L. Brouha. Occ. Health Rev. (Ottawa) 16. No 4. .3.7 (1964). The pulse rate curve* can be used a* an index of the stress imposed upon the worker by his activity and the environment in which he periorms it. Onset and course of increasing strain leading to fatigue can be detected, and work being performed at too great a physiological cost can be identified. Whether the work itself requires too great an expenditure of energy or wnetner environmental stress transforms a moderate task into a heavy one can be determined by studying the same operation under varying conditions of environment. It is fully acknowledged that pulse rate records do not evaluate ail the factor* affecting work performance. Yet they nave repeatedly provided a very useful method for quantitative evaluation of the adaptation of workers to the stresses of their work. No trouble, tune, or expense should be spared to build up a sound basis for the selection, placement, and training of workers, whether healthy or physically handicapped. "The rtght man for the right job should no longer be in the realm of wishful thinking, but should really mean greater productivity through maximum efficiency at minimum human cost. .. Author-s abst Fatigue and the Physical Environment. J R. Brown Occ. Health Rev. (Ottawa) 16, No.4, 15*20. 22 (1964) The various factors of the physical environment hav* been discussed in relation to their effect on human fatigue and productivity. Although the cause, effect, and remedy is generally well known, adverse physical environments are still commonplace in many of our factories and workplaces. The detection a; control of suen environments is properly the responsibility of the industrial hygienist and the economic importance of this control emphanses the need for suitably qualified personnel in all our major industria. undertakings. There are 36 references Author's abst 542 I. Hearing Lois: Diagnosis and Anatomic Considerations. East Range Symposium. C.J. Holmberg. J. Occ. Med! 7. 13&.144 (April. .465- The subject is discussed under the following .leadings: Sound and noise, anatomy, external ear, the middle ear, the inner ear, diagnos.s o: nearing loss, conduction loss, sensorineural or nerve-type hearing loss, tests anc e-.a.-ation of hearing losa, and noise- induced loss. Noise-induced hearing loss first affects tne nearing of sounde higher in freauency than those necessary for communication by spee:.n. a.-.c m.-. pass unnoticed unless detected b-. suitable hearing tests. Many severe exposures car im.ir a permanent hearing lots that ma-, affect communication by speech. Serial audiogram - :: -.mans exposed to noise shows a characteristic progression of hearing loss Ear., niri ocear m the region between 3,002 and o.OOO cvcies. Usually these losses occur i.rt: cvcies, and then spread in both directions until the hearing for mo*t of the aud-.s.r ?*..*..* s is affected. The extent of the spread depends on the amount of noise sustained - r : -.earing is usually not noticeable unless losses at the speech frequencies 1500, ... :. c.esi are 20 decibels or more. Substantial losses may occur before a person or. ; -- - . ..-e of the effect of none.sxposure on his hearing. Lose .Irom-nqi-ee esfpoaur-e :s i\c * - '- *, i.c.i and it is not uncommon-for'- sev e rai .vears of .exposure.to clappe-bet'dre- t.-.e: -."i .-a-a.-e p: anv impairment 1.-. tne usual'sensorineural or nerve-type nearing lo i .. . s.-.p* s a tenoenc . towarc i. ; - star.t.aliv setter hearing at 12S, 250,and 501 : .- . .-...re .r. tne mgner tones above .,111 cvcies. In a hearing conservation presra- t i.men: air conduction tr. resr.o.s :ti:i are recommended. The test frequer.e ;e s v- : . * - ..122. 2,OCC, 3.000, 4.021. b. 121 cvcies These pre-employment tfcresr.s.c a v v.-.ouid be taxen of all employees. not or.iv tr.ose who are to work in notiv areas v r.iv detect a verv earlv loss that can be heiped bv medical treatment. ................. ... . i**r. 01 13`2 2663