Contribution of gait parameters and available coefficient of friction to perceptions of slipperiness

Perceived slipperiness rating (PSR) has been widely used to assess walkway safety. In this experiment, 29 participants were exposed to 5 floor types under dry, wet and glycerol conditions. The relationship between their PSR and objective measurements, including utilized coefficient of friction (UCOF), gait kinematics and available coefficient of friction (ACOF), was explored with a regression analysis using step-wise backward elimination. The results showed that UCOF and ACOF, as well as their difference, were the major predictors of the PSR under wet and glycerol conditions. Under wet conditions, the participants appeared to rely on the potential for foot slip to form their PSR. Under glycerol conditions, some kinematic variables also became major predictors of PSR. The results show how different proprioceptive responses and ACOF contributed to the prediction of PSR under different surface conditions.

Source: Chang WR, Lesch MF, Chang CC, Matz S. Gait Posture, 2014.

An empirical analysis of thermal protective performance of fabrics used in protective clothing

Fabric-based protective clothing is widely used for occupational safety of firefighters/industrial workers. The aim of this paper is to study thermal protective performance provided by fabric systems and to propose an effective model for predicting the thermal protective performance under various thermal exposures. Different fabric systems that are commonly used to manufacture thermal protective clothing were selected. Laboratory simulations of the various thermal exposures were created to evaluate the protective performance of the selected fabric systems in terms of time required to generate second-degree burns. Through the characterization of selected fabric systems in a particular thermal exposure, various factors affecting the performances were statistically analyzed. The key factors for a particular thermal exposure were recognized based on the t-test analysis. Using these key factors, the performance predictive multiple linear regression and artificial neural network (ANN) models were developed and compared. The identified best-fit ANN models provide a basic tool to study thermal protective performance of a fabric.

Source: Mandal S, Song G. Ann. Occup. Hyg. 2014.

Fatal events in residential roofing

Residential roofing is a high risk occupation, more than nine times as risky as the average occupation and more than three times as risky as the average construction trade. To better understand the factors involved in residential roofing fatalities, 112 case reports filed by Occupational Safety and Health investigators for the years 2005-2010 were examined. In almost all of the recorded cases there was no adherence to the then current safety standards. It was found that there was little or no appropriate use of fall protection practices or equipment and that employer planning and employee training was minimal. Specific standards violated were examined as well as the monetary penalties assessed. In addition to an increase in the size of the penalties, it is hoped the recent national program "Campaign to Prevent Falls in Construction", with its emphasis on planning, needed equipment, and training will prove fruitful in mitigating falls from roofs.

Source: Moore JR, Wagner JP. Safety Sci. 2014; 70: 262-269.

Handling chemotherapy drugs

Do medical gloves really protect?
Due to their potential mutagenic, carcinogenic and teratogenic effects occupational exposure to chemotherapy drugs should be kept to a minimum. Utilization of personnel protective devices, especially the use of protective medical gloves, is a mainstay to avoid skin contact. The choice of appropriate gloves is of outstanding importance. For optimal protection in the oncology setting it is essential to establish general guidelines evaluating appropriate materials and defining quality standards. Establishing these guidelines can facilitate better handling and avoid potential hazards and late sequelae. In Europe there are no specific requirements or test methodologies for medical gloves used in the oncology environment. The implementation of uniform standards for gloves used while handling chemotherapy drugs would be desirable. In contrast, in the US medical gloves used to handle chemotherapy drugs have to fulfill requirements according to the ASTM International (American Society of Testing and Materials) standard D 6978-05. Nitrile or natural rubber latex is a preferred basic glove material, while vinyl is considered inappropriate because of its generally increased permeability. For extended exposure to chemotherapy drugs, double gloving, the use of thicker gloves and the frequent change of gloves increases their protective power.

Source: Landeck, Lilla, Gonzalez, Ernesto, et Koch, Olaf Manfred. (2014). International Journal of Cancer.

Development of a High Slip-resistant Footwear Outsole Using a Hybrid Rubber Surface Pattern

The present study examined whether a new footwear outsole with tread blocks and a hybrid rubber surface pattern, composed of rough and smooth surfaces, could increase slip resistance and reduce the risk of fall while walking on a wet floor surface. A drag test was performed to measure static and dynamic coefficient of friction (SCOF and DCOF, respectively) values for the footwear with the hybrid rubber sufrace pattern outosole and two types of commercially available boots that are conventionally used in food factories and restaurant kitchens with respect to a stainless steel floor covered with glycerol solution. Gait trials were conducted with 14 participants who wore the footwear on the wet stainless steel floor. The drag test results indicated that the hybrid rubber surface pattern sole exhibited higher SCOF (≥0.44) and DCOF (≥0.39) values than the soles of the comparative footwear (p<0.001). Because of such high SCOF and DCOF values, the slip frequency (p<0.01), slip distance (p<0.001), and slip velocity (p<0.001) for the footwear with the hybrid rubber surface pattern outsole were significantly lower than those for the comparative footwear, which resulted in no falls during trials.

Source: Yamaguchi T, Hokkirigawa K. Ind. Health. 2014.

Effects of mental fatigue on biomechanics of slips

The objective of this study was to investigate the effects of mental fatigue on biomechanics of slips. A total of 44 healthy young participants were evenly categorised into two groups: no fatigue and mental fatigue. Mental fatigue was induced by performing an AX-continuous performance test. The participants in both groups were instructed to walk on a linear walkway, and slips were induced unexpectedly during walking. We found that mental fatigue has adverse effects in all the three phases of slips. In particular, it leads to increased likelihood of slip initiation, poorer slip detection and a more insufficient reactive recovery response to slips. Based on the findings from the present study, we can conclude that mental fatigue is a risk factor for slips and falls. In order to prevent slip-induced falls, interventions, such as providing frequent rest breaks, could be applied in the workplace to avoid prolonged exposures to cognitively demanding activities.

Source: Lew FL, Qu X. Ergonomics, 2014.

The physiological impact of body armor cooling devices in hot environments

A systematic review
BACKGROUND: Heat-related illness is a primary threat to unit readiness, and individual body armor (IBA) cooling devices represent one potential solution.
PURPOSE: To quantify research findings of active and passive cooling devices designed to reduce physiological strain while wearing IBA during strenuous tasks using a systematic review approach.
METHODS: Literature searches were performed in multiple databases using the key words "physiological," "body armor," "military," "cooling," and "thermal." Two independent reviewers appraised methodological quality using a modified Downs and Black Quality Index. Physiological outcomes were tabulated and effect sizes were calculated when appropriate.
RESULTS: The search yielded 733 citations, with nine articles fitting our inclusion criteria: six articles with active and three articles with passive cooling devices.
RESULTS reveal a moderate level of methodological quality. On average, all six active IBA cooling device studies compared to controls (IBA only) reported decreases in one or more measures of physiological strain-core and skin temperature, heart rate. Conversely, passive cooling device effects were negligible.
CONCLUSION: Active cooling devices may decrease the physiological strain associated with wearing IBA in hot environments. Further development of optimal cooling strategies to reduce physiological strain during operations where IBA is required is warranted.

Source: Goforth C, Lisman P, Deuster P. Mil. Med. 2014; 179(7): 724-734.

Safety and Occupational Footwear

This new, one-of-a kind ASTM reference guide provides the latest information on safety and occupational footwear. Topics cover:
• Construction of footwear
• Component materials
• Performance requirements
• Use and maintenance
As well as an in-depth understanding into specific areas of concern, such as slip resistance, the number one cause of concern across all industries.


Double Gloves

A Randomized Trial to Evaluate a Simple Strategy to Reduce Contamination in the Operating Room
BACKGROUND: Oral flora, blood-borne pathogens, and bacterial contamination pose a direct risk of infection to patients and health care workers. We conducted a study in a simulated operating room using a newly validated technology to determine whether the use of 2 sets of gloves, with the outer set removed immediately after endotracheal intubation, may reduce this risk.
METHODS: Forty-one anesthesiology residents (PGY 2-4) were enrolled in a study consisting of individual or group simulation sessions. On entry to the simulated operating room, the residents were asked to perform an anesthetic induction and tracheal intubation timed to approximately 6 minutes; they were unaware of the study design. Of the 22 simulation sessions, 11 were conducted with the intubating resident wearing single gloves, and 11 with the intubating resident using double gloves with the outer pair removed after verified intubation. Before the start of the scenario, we coated the lips and inside of the mouth of the mannequin with a fluorescent marking gel as a surrogate pathogen. After the simulation, an observer examined 40 different sites using a handheld ultraviolet light in the operating room to determine the transfer of surrogate pathogens to the patient and the patient's environment. Residents who wore double gloves were instructed by a confederate nurse to remove the outer set immediately after completion of the intubation. Forty sites of potential intraoperative pathogen spread were identified and assigned a score.
Results: The difference in the rate of contamination between anesthesiology residents who wore single gloves versus those with double gloves was clinically and statistically significant. The number of sites that were contaminated in the operating room when the intubating resident wore single gloves was 20.3 +/- 1.4 (mean +/- SE); the number of contaminated sites when residents wore double gloves was 5.0 +/- 0 .7 (P < 0.001).
CONCLUSIONS: The results of this study suggest that when an anesthesiologist wears 2 sets of gloves during laryngoscopy and intubation and then removes the outer set immediately after intubation, the contamination of the intraoperative environment is dramatically reduced.

Source: Birnbach, David j., Rosen, Lisa F., Fitzpatrick, Maureen, Carling, Philip, Arheart, Kristopher L., et Munoz-Price, L. Silvia. (2014). Anesthesia & Analgesia.

Chute par-dessus bord de l’équipage des homardiers du Québec

Analyse des risques et pistes de prévention
L’activité de pêche commerciale est l’une des plus dangereuses du domaine industriel. Des chutes par-dessus bord se produisent chaque saison de pêche et leurs conséquences sont généralement graves, parfois mortelles. Au cours des dernières années, deux décès sont survenus dans ces circonstances au Québec lors d’activités de pêche au homard. De façon générale les causes documentées des chutes par-dessus bord sont la perte d’équilibre et l’entraînement par le gréement de pêche. Les objectifs de cette recherche sont : 1) d’analyser les risques de chute par-dessus bord et leurs déterminants lors de la pêche au homard, 2) de documenter les moyens de prévention collectifs et individuels pouvant être adaptés aux homardiers, 3) d’identifier les pistes les plus prometteuses de réduction des risques. Ces objectifs sous-tendent une compréhension approfondie de l’activité de travail de cette pêche. Cette étude s’est déroulée sur une période d’un an.


Oregon OSHA Posts Respiratory Program Guide for Small Businesses

A new publication titled Breathe Right! from Oregon OSHA is an easily understood guide to developing a respiratory protection program for owners and managers of small businesses. It covers Assigned Protection Factors and different types of respiratory hazards, fit tests, seal checks, respirator cleaning and disinfection, voluntary use, employee training, and respirator use by bearded workers.


Improving eye safety in citrus harvest crews through the acceptance of personal protective equipment, community-based participatory research, social marketing, and community health workers

For the last 10 years, the Partnership for Citrus Workers Health (PCWH) has been an evidence-based intervention program that promotes the adoption of protective eye safety equipment among Spanish-speaking farmworkers of Florida. At the root of this program is the systematic use of community-based preventive marketing (CBPM) and the training of community health workers (CHWs) among citrus harvester using popular education. CBPM is a model that combines the organizational system of community-based participatory research (CBPR) and the strategies of social marketing. This particular program relied on formative research data using a mixed-methods approach and a multilevel stakeholder analysis that allowed for rapid dissemination, effective increase of personal protective equipment (PPE) usage, and a subsequent impact on adoptive workers and companies. Focus groups, face-to-face interviews, surveys, participant observation, Greco-Latin square, and quasi-experimental tests were implemented. A 20-hour popular education training produced CHWs that translated results of the formative research to potential adopters and also provided first aid skills for eye injuries. Reduction of injuries is not limited to the use of safety glasses, but also to the adoption of timely intervention and regular eye hygiene. Limitations include adoption in only large companies, rapid decline of eye safety glasses without consistent intervention, technological limitations of glasses, and thorough cost-benefit analysis.

Source: Tovar-Aguilar JA, Monaghan PF, Bryant CA, Esposito A, Wade M, Ruiz O, McDermott RJ. J. Agromed. 2014; 19(2): 107-116.

Fatal falls in the U.S. residential construction industry

BACKGROUND: Falls from heights remain the most common cause of workplace fatalities among residential construction workers in the United States.
METHODS: This paper examines patterns and trends of fall fatalities in U.S. residential construction between 2003 and 2010 by analyzing two large national datasets.
RESULTS: Almost half of the fatalities in residential construction were from falls. In the residential roofing industry, 80% of fatalities were from falls. In addition, about one-third of fatal falls in residential construction were among self-employed workers. Workers who were older than 55 years, were Hispanic foreign-born, or employed in small establishments (1-10 employees) also had higher proportions of fatal falls in residential construction compared to those in nonresidential construction.
CONCLUSIONS: The findings suggest that fall safety within the residential construction industry lags behind commercial construction and industrial settings. Fall prevention in residential construction should be enhanced to better protect construction workers in this sector.

Source: Dong XS, Wang X, Largay JA, Platner JW, Stafford E, Cain CT, Choi SD. Am. J. Ind. Med. 2014.

Assessment of the human responses to the influence of personal liquid cooling system in the hot environment

Purpose – People working in the hot environment are constantly exposed to the overheating, that can lead to cardiovascular disorders and as a consequence result in occupational diseases. The purpose of this paper is to present developed personal liquid cooling system that is able to efficiently draw excess heat from the human organism, protecting against thermal stress.
Design/methodology/approach – The paper presents study concerning the assessment of effect of the coolant temperature in the developed liquid cooling garment (LCG) on physiological parameters of the subjects (heart rate, body temperature, skin temperature) and parameters of the undergarment microclimate, as well as subjective sensations reported by volunteers exercising in hot microclimate while wearing LCG and without LCG.
Findings – Obtained results of physiological parameters measurements, as well as undergarment physical parameters and volunteers subjective sensations, proved satisfactory level of thermal stress reduction while working in the aluminized protective clothing in hot environment by the developed personal liquid cooling system for the variant with coolant temperature 19°C and the flow rate 0.9?dm3/min.
Originality/value – This paper presents a new clothing construction intended for LCG that can efficiently support human thermoregulation processes while working in the hot environment.

Source: Grazyna Bartkowiak, Anna Dabrowska, Anna Marszalek, (2014), International Journal of Clothing Science and Technology, Vol. 26 Iss: 2, p.145 - 163.

Evaluation of two cooling systems under a firefighter coverall

Firemen often suffer from heat strain. This study investigated two chest cooling systems for use under a firefighting suit. In nine male subjects, a vest with water soaked cooling pads and a vest with water perfused tubes were compared to a control condition. Subjects performed 30 min walking and 10 min recovery in hot conditions, while physiological and perceptual parameters were measured. No differences were observed in heart rate and rectal temperature, but scapular skin temperature and fluid loss were lower using the perfused vest. Thermal sensation was cooler for the perfused vest than for the other conditions, while the cool pad vest felt initially cooler than control. However, comfort and RPE scores were similar. We conclude that the cooling effect of both tested systems, mainly providing a (temporally) cooler thermal sensation, was limited and did not meet the expectations.

Source: Teunissen LP, Wang LC, Chou SN, Huang CH, Jou GT, Daanen HA. Appl. Ergon. 2014.

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