Cardiac strain of confectionery worker in relation to heat exposure during regular work shift (original) (raw)
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Urban Climate, 2019
This study aimed at determining the effect of heat exposure on physical workload and maximum acceptable work duration in a hot and dry climate. Wet Bulb Globe Temperature, as an environmental index, and heart rate and core body temperature, as physiological indices, were used to assess environmental heat stress. For this purpose, the study was conducted on 86 acclimatized workers of six different sites of an oil industry. The comparison between heart rate at rest and work hours and core body temperature at rest and work hours revealed the existence of a significant different between heart rate and Core Body Temperature (P value < 0.001). The results also indicated a significant difference between WBGT TWA and the limit value (P value < 0.001). However, the results uncovered that the MAWD should be reduced in some units and, consequently, the work-rest regimens were modified based on this reduction. In addition, the results of this study demonstrated a statistically significant increase in and heart rate after work in excessive heat stress conditions. Heat exposure is perceived as a significant problem by the workers who worked in such workplaces. The results of this study can help managers and workers better plan and control thermal stresses.
Assessment of work ability in a hot environment of workers of different ages
International Congress Series, 2005
The aim of the study was to assess the ability to work in a hot environment as a consequence of a worker's age. Studies were conducted with 96 workers employed in a hot environment in an industry (70 men and 26 women). The participants' ages ranged from 20 to 60 years. Studies were conducted at work stations and in a laboratory. Results indicated a low level of VO 2 max in all groups of women and a low level of VO 2 max in men younger than 45 years, but an average level in men above 45 years, according to Å strand's classification. Changes in core temperature (t c ) during work in a hot environment differed slightly between all groups of men, but there were definitely greater increases of t c in older women, compared with younger women. A poorer HR recovery and worse subjective ratings of climate, thirst and physical stress were observed for older male and female workers compared with the younger ones. The above facts suggest higher physiological cost of work and lower ability to work in a hot environment of older workers, over 45 years of age, especially those with low aerobic capacity, as was the case for older women. D
2019
Occupational health hazard is a very common term in every emerging country. Along with the unorganized sector, most organized sectors including government industries are suffering from this affliction. In addition to workload, the seasonal changes also have some impacts on working environment. With this focus in mind, one hundred male industrial workers, who are directly involved to the task of Periodic Overhauling (POH) in a fabricating workshop in the public domain are selected for this research work. They have been studied during work periods throughout different seasons in a year. For each and every season, the participants working heart rate (WHR) is measured and compared with the standards given by different national and internationally recognized agencies i.e., World Health Organization (WHO) and American Conference of Governmental Industrial Hygienists (ACGIH) etc. The different environmental parameters i.e. dry bulb temperature (DBT), wet bulb temperature (WBT), globe tempe...
Physiological responses to heat strain: A study on personal monitoring for young workers
Journal of Thermal Biology, 2009
Heart rate, increased body-core temperature and sweating are the physiological responses to heat stress and they are collectively known as physiological strain. Our goal was to study levels of physiological strain in young farm workers aged 15-21 y. We also verified that heart rate is the response that exceeds threshold limits earliest as seen in previous studies. Personal monitoring for heat-strain measures directly physiological strain as it occurs and gives further information about each worker's state. When estimating levels of physiological strain, certain limits concerning heart rate were adjusted considering the young ages of the workers studied.
Occupationally induced stress, strain and peak loads as related to age
Scandinavian Journal of Work, Environment & Health, 1980
Occupationally induced stress, strain and peak loads as related to age. by Ilmarinen J, Rutenfranz J ILMARINEN J, RUTENFRANZ J. Occupationally induced stress, strain and peak loads as related to age. Scand j work environ health 6 (1980) 274-282. From six different types of work 120 men, aged 23-60 a, were classified according to the Ergonomic Job Description Questionnaire into four groups representing specific work content (producing forces, coordinating motor and sensory functions, converting information into reactions, and producing information). Work stress was assessed with measurements of oxygen consumption (V02) and with the registration of the minutes spent at different stress levels. Relative aerobic strain (RAS) was defined as the V02 during work as the percentage of V02max. Strain was measured with continuous recordings of heart rate during the workday. Peak loads were evaluated according to the relative number of minutes above the heart rate levels of 130,150 and 170 beats/min. The V02 during work was virtually identical in the age groups < 35, 35-50 and> 50 a. The RAS tended to increase with age due to the decrease in V02max. The strain remained practically the same in all the age groups. In the group "coordinating motor and sensory functions" strain tended to increase with age. Peak loads over 150 beats/min were not rare for the older subjects. The results suggest that stress and strain during work remain practically the same as age increases. The RAS, however, tends to increase with age within groups doing mainly physical work and with exposures to peak loads.
Human work capacity under combined stress of work and heat
Journal of human ergology, 1996
The working capacity of young, healthy, unacclimatized men (N = 11) was studied under long-duration (8 to 9 days) exposure to combined work and heat (dry and humid). The dry (Gr A, N = 5) and humid (Gr B, N = 6) groups were exposed to 41.3 +/- 0.6 degrees C DB, 40-50% RH and 39.2 +/- 0.6 degrees C DB, 70-80% RH, respectively, for all days of exposure. The experimental protocol was divided into: (i) direct determination of maximal oxygen uptake (VO2max) by stepped increases in bicycle ergometry everyday in the morning in the initial hours before exposure to heat, after which the recovery process of oxygen debt contraction was examined; and (ii) exposure to heat in a climatic chamber for 2 h where the subjects performed two spells of ergometric work (10 to 12 min each) at a relative intensity of 50 +/- 12 to 69 +/- 11% VO2max. The average heat exposure time for Gr A was higher (108 +/- 12 min) as compared to Gr B (95 +/- 10 min), but Gr B sustained a high heat load as reflected from t...
Thermophysiological vulnerability to Heat stress among Indoor workers
Introduction: The present study provides a practical importance to assess the magnitude of thermal stress of workers in indoor environment taking into account the workers physiological responses. Method: The study covered indoor workers iron (N=587years) and ceramics (N=426) in three seasons. Thermal measurements were recorded by Wet Bulb Globe Temperature (WBGT) Monitor. The physiological responses include skin temperature, heart rate and blood pressure. Results: The WBGT index in summer month of ceramic (34.9±2.7°C) was higher than iron foundry works (32±1.7°C). The systolic blood pressures in winter month were higher, as compared to summer months (2mmHg in iron and 11mmHg in ceramic). About 32% of iron and ceramic workers had working heart rate greater than 100 beats/min and 3% beyond 130 beats/min during the working day. The skin temperature (Tsk) profile and weighted skin temperature (Tsk) were significantly higher in summer, followed by post-monsoon and winter months. Discussion: The study assesses the physiological and thermoregulatory responses of workers to heat stress and strain for their exposure to extreme hot environment. The limit of peripheral thermoregulatory adjustability may be considered beneficial and can be taken away from the fury of high heat.
International journal of occupational safety and ergonomics : JOSE, 2013
Van-rickshaw is a popular mode of transport of people and merchandise in developing countries. The purpose of this study was to assess the effect of age on cardiovascular load of van-rickshaw pullers in the summer season (March-June) in real situations. In 142 participants, divided into 2 age groups (25-40 and 41-55 years), cardiovascular load was assessed on the basis of working and partial recovery heart rate (HR), predicted maximal HR, working maximal HR, average working HR, percentage of reserved HR, sum of recovery heart beats, percentage of recovery, relative and net cardiac cost, etc. Except for percentage of recovery, all parameters differed significantly between the groups and were significantly correlated with age. As this activity is very stressful, it places a heavy demand on the cardiovascular system. Therefore, age is an important factor for sustainability of the work, especially in a hot environment. Some ergonomic interventions are necessary to reduce cardiovascular ...
2021
Excessive heat during work creates occupational health risks; it restricts a worker's physical functions and capabilities, work capacity and productivity. Temperatures above 24-26 °C are associated with reduced labour productivity. Exposure to excessive heat levels can lead to heatstroke, sometimes even with a fatal outcome. The aim of this study is to discuss the methodology in experimental of the factor affecting heat stress in industrial workers exposed to extreme heat. The experiment will be conducted in an environmental chamber which simulates the same environment of the manufacturing industry and another arrangement which simulates the environment of a construction industry. The environmental parameters will be recorded such as the temperature, relative humidity and also the physiological parameters such as the volume oxygen uptake level and the heart rate. The heart rate and the volume of oxygen uptake will be recorded for a 15-minute interval for one shift (2 shift-manufacturing and construction). This study is conducted based on two tasks in two different conditions, outdoor and indoor. It simulates the lifting work at both manufacturing and construction industry. For manufacturing industry, the subjects are demanded to lift boxes (10kg). Meanwhile, for the construction industry, the subjects are demanded to lift a sand bag (10kg). From this study, the optimum values of temperature and humidity can be obtained which can lead to the optimum workers' performance. The increase of performance will ensure the production level at the manufacturing industries at its best and will lead to monetary gain. Besides, this can ensure that a construction project can be delivered at the right time while reducing the cost lost and the accidents at the site.
This paper describes the initial findings of research work to assess the impact of thermal conditions on the human capacity to do work. Heart rate is considered as a lead indicator of human energy consumption. A laboratory was set up where human volunteers performed standard work routines under controlled conditions. The heart rate of the volunteers was constantly monitored while the temperatures of the laboratory were varied between 5 degrees to 40 degrees centigrade. Data analysis from the initial sample of volunteers shows that the heart rate significantly increases with increase in temperature. The total heart beats which are also an indirect measure of human effort also increases with increase in temperature. Current sample data shows that the inflection points are around 10 degrees and 30 degrees centigrade. The human capacity to do work appears to dramatically drop after 30 degrees centigrade and becomes almost intolerable around 40 degrees centigrade. These initial insights are alarming enough for the industrial engineering practitioners to consider their impact in future workplace layouts and while setting up work standards. There are still many professions which require associates to physically work in open environment under varied thermal conditions and this research will have a significant impact on the way work standards for activities performed by these associates are established. The hypothesis has been statistically validated on the sample data so far and additional samples are leading to further insights.