[Prevention of occupational dermatoses; pre-employment medical examination; protective clothing, protective creams].
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Dairy Products↗
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Results for “Protective Clothing”
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[Heat-protective clothing - protective effect and stress].
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Adult↗
Effects of endurance training and heat acclimation on psychological strain in exercising men wearing protective clothing.
Two experiments examined the influences of endurance training and heat acclimation on ratings of perceived exertion (RPE) and thermal discomfort (RTD) during exercise in the heat while wearing two types of clothing. In experiment 1, young men underwent 8 weeks of physical training [60-80% of maximal aerobic power (VO2max) for 30-45 min day-1, 3-4 days week-1 at 20-22 degrees C dry bulb (db) temperature] followed by 6 days of heat acclimation [45-55% VO2max for 60 min day-1 at 40 degrees C db, 30% relative humidity (rh)] (n = 7) or corresponding periods of control observation followed by heat acclimation (n = 9). In experiment 2, young men were heat-acclimated for 6 or 12 days (n = 8 each). Before and after each treatment, subjects completed bouts of treadmill exercise (1.34 m s-1, 2% grade in experiment 1 and 0% grade in experiment 2) in a climatic chamber (40 degrees C db, 30% rh), wearing in turn normal light clothing (continuous exercise at 37-45% VO2max for a tolerated exposure of 116-120 min in experiment 1 and at 31-34% VO2max for 146-150 min in experiment 2) or clothing protective against nuclear, biological, and chemical agents (continuous exercise at 42-51% VO2max for a tolerated exposure of 47-52 min in experiment 1 and intermittent exercise at 23% VO2max for 97-120 min in experiment 2). In experiment 1, when wearing normal clothing, endurance training and/or heat acclimation significantly decreased RPE and/or RTD at a fixed power output. There were concomitant reductions in relative work intensity (% VO2max) [an unchanged oxygen consumption (VO2) but an increased VO2max, or a reduced VO2 with no change of VO2max], rectal temperature (Tre), mean skin temperature (Tsk), and/or heart rate (HR). When wearing protective clothing, in contrast, there were no significant changes in RPE or RTD. Although training and/or acclimation reduced %VO2max or Tre, any added sweat that was secreted did not evaporate through the protective clothing, thus increasing discomfort after training or acclimation. Tolerance times were unchanged in either normal or protective clothing. In experiment 2, when wearing normal clothing, heat acclimation significantly decreased RPE and RTD at a fixed power output, with concomitant reductions in Tre, Tsk, and HR; the response was greater after 12 than after 6 days of acclimation, significantly so for RPE and HR. When wearing protective clothing, the subjects exercised at a lower intensity for a longer duration than in the moderate exercise trial. Given this tactic, either 6 or 12 days of heat acclimation induces significant reductions RPE and/or RTD, accompanied by reductions in Tre, Tsk, and/or HR. Tolerance times in protective clothing were also increased by 11-15% after acclimation, despite some increase of sweat accumulation in the protective clothing. The results suggest that (1) neither endurance training nor heat acclimation reduce psychological strain when protective clothing is worn during vigorous exercise, because increased sweat accumulation adds to discomfort, and (2) in contrast to the experience during more vigorous exercise, heat acclimation is beneficial to the subject wearing protective clothing if the intensity of effort is kept to a level that allows permeation of sweat through the clothing. This condition is likely to be met in most modern industrial applications.
Acclimatization↗
A test battery related to ergonomics of protective clothing.
Specialised protective clothing, such as that worn by firefighters, is usually tested only to standards which give requirements for the materials used (e.g. EN469). However, this testing often neglects the effect the manufacturing process of the garment has on the material properties, the effects of clothing design, sizing and fit, as well as the interaction of the clothing with other components of the standard gear for the profession. Such effects can only be tested by looking at the protective gear as a whole. This paper deals with methods to do additional testing on protective garments with firefighter clothing as example. In other words, methods which go beyond EN469. Human subject tests for physiological load, heat protection, ergonomic design, loss of performance, rain/moisture protection and conspicuity/visibility of the clothing are described and proposed for evaluation of protective clothing in general and for further development of standards on firefighters' clothing.
Equipment Design↗
[Contamination of clothing while using protective clothing. The spread of germs can be reduced].
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Equipment Contamination↗
Using protective clothing.
The use of protective clothing is an essential element of infection prevention and control. Many items of protective clothing are incorporated within the concept of universal precautions--the precautions necessary to reduce exposure to blood or body fluids (Centre for Disease Prevention and Control, 1987). Protective clothing is also used to prevent the transmission of micro-organisms other than blood-borne viruses--for example, methicillin-resistant Staphylococcus aureus, Staphylococcus aureus and Mycobacterium tuberculosis.
Cross Infection↗
Design and control optimization of microclimate liquid cooling systems underneath protective clothing.
The use of protective clothing, whether in space suits, hazardous waste disposal, or sporting equipment, generally increases the risk of heat stress and hyperthermia by impairing the capacity for evaporative heat exchange from the body to the environment. To date the most efficient method of microclimate cooling underneath protective clothing has been via conductive heat exchange from circulating cooling fluid next to the skin. In order to make the use of liquid microclimate cooling systems ((LQ)MCSs) as portable and practical as possible, the physiological and biomedical engineering design goals should be towards maximizing the efficiency of cooling to maintain thermal comfort/neutrality with the least cooling possible to minimize coolant and power requirements. Meeting these conditions is an extremely complex task that requires designing for a plethora of different factors. The optimal fitting of the (LQ)MCSs, along with placement and design of tubing and control of cooling, appear to be key avenues towards maximizing efficiency of heat exchange. We review the history and major design constraints of (LQ)MCSs, the basic principles of human thermoregulation underneath protective clothing, and explore potential areas of research into tubing/fabric technology, coolant distribution, and control optimization that may enhance the efficiency of (LQ)MCSs.
Cold Temperature↗
Energy cost of physical task performance in men and women wearing chemical protective clothing.
BACKGROUND: Chemical protective clothing (CPC) is required to perform certain occupations and is known to inhibit physical performance. Few data are available that quantify the physiological response of men and women during task performance while wearing CPC. HYPOTHESIS: The mobility of a task will have a significant effect on the change in energy cost. The energy cost of wearing CPC will be greater in women than men during physical task performance. METHODS: Energy cost (VO2) and the psychophysical scales, rating of perceived exertion (RPE) and respiratory distress (RD), were measured in 32 men and 26 women during the performance of 31 physical tasks. Tasks were categorized by mobility: stationary, intermittent or continuous. Between 6-12 men and 5-13 women conducted each task wearing 2 clothing conditions: battle-dress uniform (BDU, wt = 3.7 kg) and (CPC, wt = 9.3 kg). RESULTS: VO2 L x min(-1), was higher in CPC compared with BDU for the continuous task category for both genders. However, when VO2 (ml x kg(-1) clothed wt x min(-1)) was normalized for clothing weight, there remained a significant clothing effect for the continuous category, but there were no gender differences. VO2, expressed as a % VO2max, was significantly increased for BDU compared with CPC for the continuous task category only. This difference was significantly greater for women than men. Women exercised at a higher % VO2max and reported a higher RPE than men for all categories in both BDU and CPC. Both genders reported higher RD wearing CPC for the continuous task category only. CONCLUSIONS: There is an increase in energy cost wearing CPC during continuous tasks which can be attributed to both the clothing weight and the hobbling effect. Wearing CPC is more physiologically and psychologically demanding for women than men, especially when performing tasks of a continuous nature.
Adolescent↗
Effects of training and acclimation on heat tolerance in exercising men wearing protective clothing.
This study examined the effectiveness of endurance training and heat acclimation in reducing the physiological strain imposed by exercising in the heat while wearing protective clothing. Seven young men underwent 8 weeks of physical training [60-80% maximal aerobic power (VO2max) for 30-45 min.day-1, 3-4 days.week-1 at < 25 degrees C] followed by 6 days of heat acclimation (45-55% VO2max for 60 min.day-1 at 40 degrees C, 30% relative humidity). Nine other young men underwent corresponding periods of control observation and heat acclimation. Before and after each treatment, subjects completed a treadmill walk (4.8 km.h-1, 2% grade) in a climatic chamber (40 degrees C, 30% relative humidity), wearing in turn normal combat clothing or clothing protecting against nuclear, biological, and chemical (NBC) agents. Criteria for halting this test were: (1) a rectal temperature (T(re)) of 39.3 degrees C; (2) a heart rate (fc) > or = 95% of the subject's observed maximum, maintained for 3 min; (3) unwillingness of the subject to continue; (4) the elapse of 120 min. The training regimen increased mean VO2max by 16% and mean plasma volume by 8%. When tested in normal combat clothing, the rates of increase in T(re) and fc were slower after training. However, when wearing NBC protective clothing, the only significant change induced by training was a higher mean skin temperature (Tsk) in the early part of the test. Heat acclimation increased the mean plasma volume of untrained subjects by 8%, but their VO2max remained unchanged. When tested in normal combat clothing, acclimation decreased their mean values of T(re), Tsk, fc, and metabolic rate. When wearing NBC protective clothing, the only significant decrease after acclimation was in overall T(re). In trained subjects, heat acclimation induced no further improvement in any physiological variable when wearing normal combat clothing, but reduced overall T(re) and Tsk when wearing NBC protective clothing. Training- or acclimation-induced increases of sweat secretion (an average increment of 0.14-0.23 kg.h-1) were not accompanied by any statistically significant increase in sweat evaporation when wearing NBC protective clothing. Moreover, tolerance times were unchanged in either normal combat (116-120 min) or NBC protective clothing (47-52 min). We conclude that neither endurance training nor heat acclimation do much to improve exercise tolerance when wearing NBC protective clothing in hot environments, because any added sweat secretion decreases blood volume and increases discomfort without augmenting body cooling.
Acclimatization↗
[Study of dissemination and penetration of microorganisms in protective clothing].
Microorganism-protective working clothes should be considered one of the most important elements determining general culture of the production process, health state of the staff and technical and economic level of enterprises. In order to improve quality of special protective clothes, microbic contamination of overalls was studied in industrial premises with different levels of air bacterial contamination. Under laboratory conditions microorganism permeability of 15 articles of cotton cloth used for clothes weaving was also defined. Proceeding from the complex studies the recommendations on the use of fibre in microorganism-protective overalls' manufacture were presented.
Bacteria↗
Pesticide protective clothing.
In looking into future directions of "protective clothing" for pesticide users, the final EPA ruling scheduled for release in June 1992 (Smith personal communication) places the majority of its recommendations on the label. Therefore, it will be up to pesticide manufacturers to provide protective clothing information on their products labels. Research on protective clothing continues to show variations due to fabric characteristics of fiber content, fabric construction and finish. These variabilities are compounded by variation s due to pesticide formulation and pesticide chemical and are further compounded by field studies vs laboratory simulations. With hundreds of fabric variations compounded by the thousands of chemical compounds and formulation variations, the consumer cannot be expected to make proper decisions regarding protective clothing. The user of the product does not have the knowledge to select the appropriate clothing. Manufacturers must supply this information, but they must also have data to support recommendations of their clothing for pesticide protection. This shifts the responsibility for recommending adequate protective clothing, as well as the concern for product liability, to the manufacturer.
Humans↗
Need for protective clothing and equipment in small workplaces.
Some kind of protective clothing and personal safety items was needed in 90% of the 163 workplaces surveyed. Protective clothing was used in 31%, ear protectors in 28%, eye protectors in 22%, respiratory tract protectors in 18% and other safety items in 1% of the firms. Gloves were the most commonly used type of protective clothing. Protection against risks was proper in one-fourth of the firms, satisfactory in half, and poor or lacking in the rest. Ninety-five percent of the protectors available were appropriate, but only in a few companies were they properly cared for. Seven (12%) industrial firms, 15 (20%) service establishments and 1 (7%) other firm lacked proper protective clothing or safety items. Faults were generally attributed to insufficient knowledge or negligence of responsibilities on the part of the employers. Management should provide more appropriate instruction for workers in the use and, particularly, the maintenance of personal protectors. To be effective, the inspection of the appropriateness of the protectors requires suitable training. This training should also be received by the staff providing occupational health services. Visits to workplaces, as well as health examinations, provide an opportunity to discuss protection and to advise employers and employees on protection. The problems of protection against harmful exposures is closely connected with health counseling. Yet, the provision of proper protectors and the supervision of their use is still the responsibility of the employer.
Accidents, Occupational↗
[Is the lead-equivalent suited for rating protection properties of lead-free radiation protective clothing?].
PURPOSE: Currently, lead-free x-ray-protective clothing is classified by the European production standard EN 61 331-3. To evaluate protective effects of lead-free materials according to this standard, the certifying offices as well as customers solely refer to the lead equivalent (LE). The LE of lead-free protective clothing, however, depends on the tube voltage (energy spectrum). Therefore, stating a single value for x-ray-protective clothing does not reveal the protective efficacy for the complete range of energy as applied in clinical practice. Moreover, the method of narrow beam geometry does not account for information on secondary radiation (scattered and fluorescent radiation) generated within the material. Lead-free materials, however, generate large-scale fluorescent radiation, especially for elements with atomic numbers below 60. As a consequence, full-scale secondary radiation of a given material can only be detected with a broad beam setup. MATERIALS AND METHODS: In accordance with IEC 61 331-1, we compared commercially available radiation-protective aprons manufactured with lead-free or partially lead-free materials with aprons manufactured on a lead-oxide basis. In addition to the LE, attenuation ratios and dose-build-up-factors under broad beam-conditions were evaluated. RESULTS: In comparison with lead-oxide materials, protection efficacy of lead-free materials is reduced by up to 70 %, particularly for a tube voltage below 80 kV. Lead-composite materials (partially lead-free materials) are less affected. CONCLUSION: Users and patients wearing lead-free x-ray-protective clothing might unknowingly be exposed to a much larger dose than generally assumed. In the future, radiation protection rating should exclusively refer to the "attenuation ratio", which is based on broad beam geometry and characterizes radiation attenuation much more precisely than the lead equivalent.
Fluorescence↗
Reducing self-injury and corresponding self-restraint through the strategic use of protective clothing.
We examined the use of protective clothing to reduce a retarded male's face-punching and leg-kicking and two corresponding forms of self-restraint--arm and leg self-restraint. The resident was observed each day in three sessions of randomly ordered conditions (one condition per session): without any protective clothing, with a padded helmet, and with a padded helmet and padded slippers. Use of the padded helmet substantially reduced face-punching and arm self-restraint. The addition of padded slippers reduced leg-kicking and leg self-restraint. These results suggest a practical and effective means of controlling self-injury and self-restraint. They are also consistent with the possibility that the resident's arm restraint was maintained in part by escape or avoidance of face-punching and that his leg restraint was maintained in part by escape or avoidance of leg-kicking.
Adolescent↗
Physiological tolerance to uncompensable heat stress: effects of exercise intensity, protective clothing, and climate.
This study determined the influence of exercise intensity, protective clothing level, and climate on physiological tolerance to uncompensable heat stress. It also compared the relationship between core temperature and the incidence of exhaustion from heat strain for persons wearing protective clothing to previously published data of unclothed persons during uncompensable heat stress. Seven heat-acclimated men attempted 180-min treadmill walks at metabolic rates of approximately 425 and 600 W while wearing full (clo = 1.5) or partial (clo = 1.3) protective clothing in both a desert (43 degrees C dry bulb, 20% relative humidity, wind 2.2 m/s) and tropical (35 degrees C dry bulb, 50% relative humidity, wind 2.2 m/s) climate. During these trials, the evaporative cooling required to maintain thermal balance exceeded the maximal evaporative capacity of the environment and core temperature continued to rise until exhaustion from heat strain occurred. Our findings concerning exhaustion from heat strain are 1) full encapsulation in protective clothing reduces physiological tolerance as core temperature at exhaustion was lower (P < 0.05) in fully than in partially clothed persons, 2) partial encapsulation results in physiological tolerance similar to that reported for unclothed persons, 3) raising metabolic rate from 400 to 600 W does not alter physiological tolerance when subjects are fully clothed, and 4) physiological tolerance is similar when subjects are wearing protective clothing in desert and tropical climates having the same wet bulb globe thermometer. These findings can improve occupational safety guidelines for human heat exposure, as they provide further evidence that the incidence of exhaustion from heat strain can be predicted from core temperature.
Adult↗
A suggested approach to the selection of chemical and biological protective clothing--meeting industry and emergency response needs for protection against a variety of hazards.
The paper describes the development of a comprehensive decision logic for selection and use of biological and chemical protective clothing (BCPC). The decision logic recognizes the separate areas of BCPC use among emergency, biological, and chemical hazards. The proposed decision logic provides a system for type classifying BCPC in terms of its compliance with existing standards (for emergency applications), the overall clothing integrity, and the material barrier performance. Type classification is offered for garments, gloves, footwear, and eye/face protection devices. On the basis of multiple, but simply designed flowcharts, the type of BCPC appropriate for specific biological and chemical hazards can be selected. The decision logic also provides supplemental considerations for choosing appropriate BCPC features.
Decision Support Techniques↗
Methyl isocyanate liquid and vapor permeation through selected respirator diaphragms and chemical protective clothing.
Initially, a study was undertaken to evaluate selected chemical protective clothing suitable for use by emergency response personnel confronted with methyl isocyanate (MIC). Twenty-two chemical protective clothing materials were tested against liquid methyl isocyanate. Chemical permeation breakthrough times for these clothing materials demonstrate that only one of these garments can be considered as a candidate material against liquid MIC. In a subsequent study, three chemical protective clothing materials were evaluated against approximately 800 ppm MIC vapor. Chemical permeation breakthrough times demonstrate that these materials can be considered candidate materials. A final study tested self-contained breathing apparatus (SCBA) diaphragms. Four SCBA diaphragms were tested and all experienced rapid breakthrough when exposed to liquid MIC. Next, three SCBA diaphragms were exposed to approximately 800 ppm MIC vapor. The data demonstrate that the SCBA should be worn inside a total encapsulating suit.
Cyanates↗
Work performance at 40 degrees C with Canadian Forces biological and chemical protective clothing.
This study examined the effects of a hot environmental temperature (40 degrees C and 50% relative humidity) and metabolic rate on soldiers' tolerance time (TT) while wearing various levels of the Canadian Forces biological and chemical (BC) defence protective clothing. The subjects, 19 unacclimatized males, were assigned to exercise at either a light intermittent (LI) (N = 4), light continuous (LC) (N = 5), moderate continuous (MC) (N = 5) or heavy continuous (HC) (N = 5) metabolic rate. For groups LI and LC, exercise involved walking on a treadmill at 4.0 km.h-1 with a 0% grade and lifting 10 kg boxes. LI alternated between 15 min of exercise and 15 min of rest. Group MC walked at 4.8 km.h-1 with a 3% grade and lifted 15 kg boxes. Group HC walked at 4.8 km.h-1 with a 7.5% grade and lifted 20 kg. Subjects were tested wearing three levels of clothing protection: combat clothing (L); combat clothing and a semi-permeable BC overgarment (M); combat clothing and BC overgarment, gloves, boots and respirator (H). TT was the time until rectal temperature reached 39.3 degrees C, heart rate reached 95% maximum, dizziness or nausea precluded further exercise, or 5 h had elapsed. For group LI, TT was similar for L (137 +/- 15 min) and M (117 +/- 9 min) clothing. TT was significantly reduced for H (67 +/- 6 min) clothing. For group LC, TT was greater for L (91 +/- 11 min) compared with either M (68 +/- 7 min) or H (55 +/- 2 min) clothing.(ABSTRACT TRUNCATED AT 250 WORDS)
Adult↗