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PubMed1984

Cardiorespiratory and thermal effects of wearing gas protective clothing.

Six healthy men aged 25 to 37 walked on a treadmill at work levels of 21 and 41% of their VO2max for 25 to 30 min wearing gas protective clothing (GPC) consisting of an impermeable suit with a self-contained breathing apparatus (total weight 25 kg) or shorts (control tests, CT) in a temperate environment (ta 24.3 degrees C +/- 1.0 degrees C, rh 30-50%). When the GPC was worn at 21 and 41% VO2max, the most prominent increases, compared with the CT, were noted in the heart rate (means +/- SE, 120 +/- 5 vs 76 +/- 3 beats min-1 and 171 +/- 5 vs 103 +/- 3 beats min-1), mean skin temperature (36.1 +/- 0.2 vs 31.3 degrees C +/- 0.1 degree C and 36.9 +/- 0.3 vs 30.9 degrees C +/- 0.4 degrees C) and sweat rate (473 +/- 51 vs 70 +/- 23 g m-2 h-1 and 766 +/- 81 vs 135 +/- 18 g m-2 h-1) indicating a high cardiovascular and thermoregulatory strain, which was not decreased by ventilating the suit with an air flow of 281 min-1 at 41% VO2max. The ventilation, oxygen consumption and production of carbon dioxide increased in relation to the extra weight of the GPC, partly dependent on the dynamic work level. It was concluded that the increase in the physiological load caused by the GPC was so high that the work-rest regimens, workers' level of physical fitness, cardiovascular health and heat tolerance should be considered whenever gas protective clothing is used.

Adult↗
PubMed1991

Work load and physiological responses during asbestos removal with protective clothing.

The removal of asbestos-containing building materials requires the use of dust-repelling protective clothing and a respirator. The present study was aimed at measuring physiological responses to asbestos removal in actual work situations. The subjects were eight asbestos workers. During the work, the men wore permeable or impermeable clothing along with a powered or non-powered filtering device including a full-face or half-face mask. Environmental parameters, work postures, heart rate (HR), the skin temperature at two sites and the rectal temperature were recorded every minute during work. Perceived exertion, thermal sensation, thermal comfort, and skin wetness were rated by the subjects. The ambient temperature at work sites ranged from 19 degrees to 37.5 degrees C and relative humidity, from 21% to 50%. The mean HR ranged from 101 to 141 beats min-1. The calculated (from HR measurements) average oxygen consumption (VO2) varied from 0.9 to 1.9 l min-1, which corresponded to 27%-60% of the maximal value. The peak rectal temperature and the highest mean of two measurements of skin temperature were 37.7 degrees +/- 0.3 degree C and 34.4 degrees +/- 0.9 degree C, respectively. The sweat rate varied from 162 to 583 g h-1. Poor work posture was common during asbestos removal. The arms were elevated over shoulder level for 35% of the work time. During the work the mean physiological strain was considered to be moderate, with some heavy peak loads being registered.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1990

Circadian rhythm of rectal temperature in man with two different types of clothing.

We compared the circadian rhythm of human rectal temperature with two different types of clothing at an ambient temperature of 27.5 degrees +/- 0.5 degrees C and a relative humidity of 40 +/- 10%. One clothing covered the whole body area except for the head, hands and feet (Type A, weight 475 g, 0.98 clo), the other covered the trunk, upper arms and thighs (Type B, weight 366 g, 0.93 clo). Major findings are summarized as follows: (1) Late evening fall after retiring and a morning rise after rising in the rectal temperature rhythm were significantly quicker in Type B than in Type A. (2) Late evening rise after retiring and a morning fall after rising in the skin temperatures of the extremities were quicker in Type B than in Type A. (3) A range of oscillation in the circadian rectal temperature rhythm was significantly larger in Type B than in Type A. It was suggested that the quicker late evening rise and morning fall of the skin temperatures in the extremities after retiring and rising, respectively, might be responsible for the quicker late evening fall and morning rise of the circadian rectal temperature.

Adult↗
PubMed1990

Solar heat load: heat balance during exercise in clothed subjects.

Six subjects exercised for 60 min on a cycle ergometer. Their backs were exposed to an artificial 'sun' with a spectral distribution similar to sunlight and an intensity of 724 W m-2. Each subject took part in four experiments in random order: wearing suits of polyester (insulation value = 0.5 clo), white (WP) or black (BP), or cotton (0.6 clo), white (WC) or black (BC). Measured by partitional calorimetry, the calculated heat losses and gains for the four conditions balanced within less than 10%. The differences between the short-wave radiation gains of subjects in white or black garments were small. This is due to the transparency of the white materials, which allows a larger percentage of the radiation to penetrate the clothing. The surface temperatures of the sun-exposed areas were very high, especially in the black suits. This promotes dry heat loss. Therefore the sweat loss in the black suits and the differences between the black and white clothes became relatively small. The physiological strain in steady-state exercise, as expressed by average heart rates, was 142 (WP), 154 (BP), 151 (WC), and 160 (BC) beats min-1; the sweat losses were 649 (WP), 666 (BP), 704 (WC), and 808 (BC) g. For both of these measures values for white polyester were significantly less than those for black cotton.

Adult↗
PubMed1984

Measurement of mean skin temperature of clothed persons in cool environments.

The precision with which mean skin temperature could be estimated from some few points on clothed persons in a cool environment was studied. The skin temperature data were obtained from experiments on 10 clothed persons who were resting and working at an environmental temperature of 10 degrees C. With these data, eleven calculation formulas in current use were compared to a "reference mean skin temperature" based on a weighting formula involving 13 local skin temperatures. It was concluded that no formula including less than seven points gave a reasonably accurate mean skin temperature in this cool environment. In addition, a stepwise correlation analysis involving linear regression was performed on the data. This gave 12 new calculation formulas, which were evaluated for accuracy in estimating mean skin temperature. Among these, a weighting formula involving only four local skin temperatures was selected to be recommended for use in field investigations: Tsk = 9.429 + 0.137 X Tforehead + 0.102 X Thand + 0.290 X Tlower back + 0.173 X Tlower leg.

Adolescent↗
PubMedDate not supplied

Worker exposure and protective clothing performance during manual seed treatment with lindane.

Twelve workers were monitored for exposure to 18.75% lindane dust formulation during manual wheat seed treatment. The mean total actual exposure rate was 32.89 mg/hr. Potential respiratory exposure averaged 0.0057 mg/hr (less than 1% of the total), with seven workers receiving no measurable respiratory exposures. Mean hand exposure was 1.84 mg/hr (5.6%). Dermal exposure to the head and neck averaged 4.28 mg/hr (13%). Exposure measured beneath the workshirt and workpants averaged 26.8 mg/hr (81.4%). The workshirt and workpants provided 3.4-fold and 11.5-fold protection factors, respectively. Forearm exposure measured beneath the workshirt represented more than 40% of total actual exposure. The small contribution of hand exposure to total dermal exposure was consistent with the use of chemical-resistant gloves by all workers. Total dermal exposure could be reduced substantially by wearing coveralls over regular work clothing, and by the use of guantlet-type gloves. It is recommended that worker education concerning personal hygiene and the appropriate use of protection clothing be made essential components of exposure reduction programs.

Agricultural Workers' Diseases↗
PubMed1995

The effects of two different types of clothing on seasonal warm acclimatization.

The work described in this paper investigates the effects of two types of clothing leaving the legs covered or uncovered, on seasonal warm acclimatization in women. Experiments were carried out to observe the differences in thermal responses between two groups of subjects who dressed themselves in trousers or knee-length skirts during the daytime for 3 months from April to June. Rectal temperatures in the subjects wearing skirts were found to be shifted to higher levels when the season gradually became warmer from spring to summer. The results suggest that the clothing type worn in daily life may play an important role in the seasonal warm acclimatization of thermal responses in humans.

Acclimatization↗
PubMed1994

The effects of two different types of clothing on seasonal cold acclimation of thermophysiological responses.

The work described in this paper investigated the effects of two types of clothing, leaving the legs covered or uncovered, on seasonal cold acclimation in women. Experiments were carried out to observe the different thermal physiological responses between two groups of subjects, who dressed themselves in knee-length skirts or trousers during the daytime for 3 months from September to November. It was found that rectal temperatures and heart rates in the subjects wearing skirts were shifted to lower levels when the season gradually became colder. The results suggest that the clothing type worn in daily life may play a potential role in seasonal cold acclimation of thermal physiological responses in man.

Acclimatization↗
PubMed1989

Effects of wearing two different types of clothing on body temperatures during and after exercise.

The experiment was conducted to investigate the human thermoregulatory responses during rest, exercise and recovery at Ta 20 degrees C and 60% R.H. under the conditions of wearing two different types of clothing. Six healthy men wore two types of clothing: one covering the whole body area except the head (Type A, weight 1656 g), and the other covering only the trunk, upper arms and thighs (Type B, weight 996 g). The level of rectal temperature was kept significantly higher in Type B than in Type A during rest and recovery. The increased and decreased rates of rectal temperature during exercise and recovery were significantly greater in Type A than in Type B, respectively. These findings are discussed from the viewpoint of the differences of skin temperatures of the extremities between Type A and Type B.

Adolescent↗
PubMed1989

Piecework, repetitive work and medicine use in the clothing industry.

This study was designed to examine the potential effects of severe time constraints on workers' health. Medicine use is considered to be an indicator of non-specific morbidity that is worthy of interest in industrial health research when it is possible to compare workers who share the same culture and socio-economic characteristics, but are submitted to different work conditions. In the clothing industry, our hypotheses were that (1) piecework paid operators would have a higher percentage of medicine users than the hourly paid and (2) operators who did repetitive work would have a higher percentage of medicine users than those who did non-repetitive work. Women selected into the study were between the ages of 45 and 70, natives of Canada, spoke French and lived in the metropolitan region of Montreal. The occupational data came from the files of The Ladies' Clothing Joint Commission. They encompass the 30-year period 1956-85. Data on socio-economic characteristics, smoking status and medicine use of the 800 respondents were obtained by questionnaires administered by specially trained nurses. Among currently employed women, the probability of using stomach medication was higher for pieceworkers than among women who received an hourly wage: OR = 2.57 (1.19-3.96). The probability was also higher for women who did repetitive work than for women who did non-repetitive work: OR = 2.43 (1.26-3.60).

Aged↗
PubMed1994

Clothing burns in Zaria.

From 1980 to 1989, 45 patients with clothing burn injuries were admitted into the Ahmadu Bello University Teaching Hospital, Zaria, Nigeria. Children aged 15 years and below numbered 30 and adults aged 16 years and above totalled 15. There was a female preponderance in the ratio of 1.8:1. The cumulative monthly frequency between October and February recorded the highest number of admissions (77 per cent) with a peak in January (31 per cent). The involvement of women and children especially those below the age of 5 years is noteworthy. Eighty per cent of the patients had a major injury with a total mortality of 42 per cent. The improvement in the economic standard of the populace shown by the improvement in cooking methods, the proper use of gas cookers and kerosene lanterns, the avoidance of bedside fires during the night, the guarded use of loose indigenous garments, and the use of nursery schools for the care of children below 5 years of age will help to lower the incidence of clothing burn injuries in our environment.

Accidents, Home↗
PubMed2006

Clothing damage analysis in alleged sexual assaults--the need for a systematic approach.

Clothing damage analysis is an integral part of the examinations carried out in sexual assault type cases. This analysis can be used to corroborate different versions of events and is at its most powerful in elucidating false allegation cases and consent cases. The purpose of this study was to determine to what extent people with varying levels of forensic awareness, experience and training could correctly carry out damage analysis. Two participant groups were asked to take part in this study. Group A ('forensic group') comprised participants at a forensic science conference, and Group B ('student group') comprised students undertaking a degree course in Forensic Science. Each group was given a practical workshop consisting of a lecture outlining common fabric types and general features observed in different damage types. Each participant was subsequently shown 25 pieces of 'damage' and asked to identify both the type of fabric construction (knit or weave) and the type of damage (cut, tear, rip, wear and tear). The ability to identify fabric construction and damage types varied within the two groups studied and across the groups. The forensic group performed better both in fabric and damage assessment than the student group. This paper suggests a systematic approach to clothing damage analysis to maximise the benefits that can be obtained from this area of forensic science and to minimise the subjectivity within the field.

Adolescent↗
PubMed2000

Performance of a 2D image-based anthropometric measurement and clothing sizing system.

Two-dimensional, image-based anthropometric measurement systems offer an interesting alternative to traditional and three-dimensional methods in applications such as clothing sizing. These automated systems are attractive because of their low cost and the speed with which they can measure size and determine the best-fitting garment. Although these systems have appeal in this type of application, not much is known about the accuracy and precision of the measurements they take. In this paper, the performance of one such system was assessed. The accuracy of the system was analyzed using a database of 349 subjects (male and female) who were also measured with traditional anthropometric tools and techniques, and the precision was estimated through repeated measurements of both a plastic mannequin and a human subject. The results of the system were compared with those of trained anthropometrists, and put in perspective relative to clothing sizing requirements and short-term body changes. It was concluded that image-based systems are capable of providing anthropometric measurements that are quite comparable to traditional measurement methods (performed by skilled measurers), both in terms of accuracy and repeatability.

Anthropometry↗
PubMed2003

Thermal comfort and clothing insulation of resting tent occupants at high altitude.

Thirty-nine males and 18 females, in six groups, participated in six high altitude treks (each lasting 3-4 weeks and climbing up to 5500m) in the Himalaya and Karakoram. Inverse relationships between mean overnight total insulation (sleeping bag plus clothing) and air temperature in tents were recorded for all treks. Average overnight thermal sensations varied little with air temperature as the subjects modified their clothing insulation to maintain thermal sensations warmer than 'neutral' for all treks. For combined treks, subjects adjusted their mean overnight total insulation up to 7clo for thermal sensations of between 0 ('neutral') and +1 ('slightly warm') on average, measured on the standard seven-point thermal sensation scale developed for everyday low-altitude conditions. Very few subjects (3% of all daily responses, on average) reported 'cool' or 'cold' sensations. General tent discomfort increased with altitude suggesting that subjects interpreted tent comfort predominantly in terms of thermal outdoor conditions.

Adult↗
PubMed2000

Environmental tobacco smoke uptake by clothing fabrics.

The uptake of cigarette smoke by a variety of clothing fabrics was determined. The tested fabrics included wool, linen, cotton, silk, rayon, acetate and polyester. While a variety of factors effect such absorption, polyester fabrics were found to significantly take up less smoke than all the other tested cloths. A simple and rapid technique is described for measuring such absorption.

Clothing↗
PubMed1999

Protein-contact eczematous reaction to cornstarch in clothing.

Protein contact dermatitis is an eczematous reaction to antigens often associated with immediate hypersensitivity. A patient with a history of atopic eczema and multiple immediate sensitivities was seen for a persistent dermatitis of the face, hands, and clothing areas of the trunk and arms. Investigation showed a positive prick test to cornstarch, and avoidance of glove powder and starch in her clothing cleared what had been a recalcitrant problem.

Clothing↗
PubMed1998

Is baby too warm? The use of infant clothing, bedding and home heating in Victoria, Australia.

Overheating of infants has been associated with a raised risk for sudden infant death syndrome (SIDS). Data on the use of heating, bedding and clothing and other measures affecting the thermal environment of 4 week old infants were collected at a home interview for infants of women born in Australia (Anglo-Celtic background), in Southern Europe, in Asia and of women who had a planned out-of-hospital birth. These groups have different risks of SIDS not explained by the classic social and perinatal risk factors nor associated with the currently promoted 'new' risk factors. Thermal insulation of the infant's bedding and clothing and excess thermal insulation (for any observed room temperature) were calculated. Bed sharing differed significantly between the groups as did the use of a sheepskin, tucking in firmly, the closing of doors and windows and the use of heating in the infant's room. After stratifying by bed sharing practice and season of interview, it was found that bed sharing infants had more thermal insulation than those sleeping alone irrespective of season of interview. Infants sleeping alone in the Asian-born and Southern European-born groups were kept warmer than infants in the other two groups. Cultural factors appear to affect the thermal environment in which infants are raised. Some bed sharing infants in all four groups were inappropriately warm, particularly in colder weather, but this was more likely in the Asian-born (low risk) group than in the home birth (high risk) group. These results do not explain the differences in SIDS incidence between the groups.

Adult↗
PubMed1978

Body temperatures in relation to heart rate for workers wearing impermeable clothing in a hot environment.

Thermal reactions and heart rate were measured for men wearing impermeable clothing in a hot environment. Even at rest, the Ts increase was remarkable. At the 30th minute, Ts reached 37.2 +/- .4 degrees (+/- SD). Experimental walking (wearing impermeable clothes) occasioned significant (p less than .001) rises in thermal reactions and HR in comparison to control walking; Tr, Tb, Ts at the 30th minute were 38.4, 38.4, 38.1 degree C respectively, and HR was 162 beats/min. No plateau for these responses was reached during 30 minutes of experimental walking. Tr continued to rise after the subjects stopped exercising. The regression equation of Tr on HR in experimental walking differed from that of control walking. If Tr is used as an index for work safety, a lower Tr is needed under such severe conditions.

Adolescent↗