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5.
  • Lundgren-Kownacki, K., et al. (författare)
  • Exploring how a traditional diluted yoghurt drink may mitigate heat strain during medium-intensity intermittent work: a multidisciplinary study of occupational heat strain
  • 2018
  • Ingår i: Industrial Health. - : National Institute of Occupational Safety and Health, Japan. - 0019-8366. ; 56:2, s. 106-121
  • Tidskriftsartikel (refereegranskat)abstract
    • It is common practice in India to consume the dairy drink buttermilk as a way of mitigating occupational heat strain. This paper explores the thermoregulatory and hydration benefits of drinking buttermilk but also the impacts of work in a hot environment on the gut microbiota, renal and cognitive function. Twelve healthy participants were subjected to a 3-h period of medium load physical intermittent work in a climatic chamber (34 degrees C, 60% RH). The subjects were given water, buttermilk (700 ml) or no rehydration at random. Mean body temperatures when no rehydration was given were significantly higher (p <= 0.001). When subjects drank water or buttermilk they had a lower sweat rate than with no rehydration (p <= 0.05) and the perception of feeling hot, uncomfortable, thirsty and physically exerted was significantly reduced (p <= 0.05). A hormonal stress response at the end of the exposure was seen when not drinking (p <= 0.05). No differences in cognitive abilities and gut microbiota were found. The exposure lowered the renal blood flow suggesting an acute impact of short term heat exposure. It was also found that buttermilk has a protective effect on this impact. Our results demonstrated that keeping hydrated by water/buttermilk consumption mitigates heat strain in well-nourished subjects.
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6.
  • Abeysekera, John, et al. (författare)
  • Some design recommendations to improve comfort in helmets: a case study from China
  • 1996
  • Ingår i: Journal of Human Ergology. - : Tokyo, Uni. of Tokyo Press.. - 0300-8134. ; 25, s. 145-154
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract in Undetermined Unless the basic user needs are satisfied in safety helmets, it is difficult to get workers to wear them habitually and for long periods. Hotness, weight and fitting problems are major wearability issues that require improvements. The enormous need for an optimally designed helmet in China prompted a case study on comfort aspects in helmets. The subjective impressions of the wearers of test helmets provided useful information for design changes to improve comfort. The heat transfer measurements through helmets indicated the need for ventilation openings to be provided on the shell of plastic helmets. Due to the advantage of low weight and good ventilation, it is recommended that cane helmets be further developed to improve protection, wearability and durability, and subsequently be produced in large scale.
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7.
  • Abeysekera, John, et al. (författare)
  • The identification of factors in the systematic evaluation of slip prevention on icy surfaces
  • 2001
  • Ingår i: International Journal of Industrial Ergonomics. - 0169-8141 .- 1872-8219. ; 28:5, s. 303-313
  • Tidskriftsartikel (refereegranskat)abstract
    • Slips and falls on icy roads often result in fractures or sprains and is a major problem in Nordic countries. Walking trials by 25 subjects wearing four types of winter shoes on five different icy walking surfaces provided subjective and objective measures of tendency to slip and number of slips, respectively. Since friction is a major determinant of a slip, the influence of material spread on icy surfaces, the surface temperatures and the shoe soling characteristics versus the Coefficient of Friction (COF) of the shoes were measured. Sand and gravel on icy roads had positive effects on improving COF. The study revealed that the aetiology of slips and falls is multi-faceted and attempts to solve the problem must adopt a systems approach. Perception of risk, aging, training, experience and postural balance are other factors to be considered in preventing slips and falls. Future research should concentrate on the degree of impact of each factor to the aetiology of slips and falls, which can help to decide priority action in preventing slips and falls.
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8.
  • Abeysekera, John, et al. (författare)
  • The identification of factors in the systematic evaluation of slip prevention on icy surfaces
  • 2001
  • Ingår i: International Journal of Industrial Ergonomics. - : Elsevier. - 0169-8141. ; 28, s. 303-313
  • Tidskriftsartikel (refereegranskat)abstract
    • Slips and falls on icy roads often result in fractures or sprains and is a major problem in Nordic countries. Walking trials by 25 subjects wearing four types of winter shoes on five different icy walking surfaces provided subjective and objective measures of tendency to slip and number of slips, respectively. Since friction is a major determinant of a slip, the influence of material spread on icy surfaces, the surface temperatures and the shoe soling characteristics versus the Coefficient of Friction (COF) of the shoes were measured. Sand and gravel on icy roads had positive effects on improving COF. The study revealed that the aetiology of slips and falls is multi-faceted and attempts to solve the problem must adopt a systems approach. Perception of risk, aging, training, experience and postural balance are other factors to be considered in preventing slips and falls. Future research should concentrate on the degree of impact of each factor to the aetiology of slips and falls, which can help to decide priority action in preventing slips and falls.
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9.
  • Alametsä, Jarmo, et al. (författare)
  • Age-related circulatory responses to whole body cooling: observations by ballistocardiographic EMFi sensors
  • 2014
  • Ingår i: Ambience14 & 10I3M, Scientific conference for Smart and functional textiles, Well-Being, Thermal comfort in clothing, Design, Thermal Manikins and Modelling,Tampere Hall, Tampere, Finland,2014-09-07 - 2014-09-09. - : Tampere University of Technology. ; 1
  • Konferensbidrag (refereegranskat)abstract
    • The purpose was to study age related changes in circulatory system via Ballistocardiography (BCG) by utilizing Electromechanical Film (EMFi) sensors by gradually changing the ambient temperature from a thermoneutral area to cold direction. ECG and BCG were recorded from a young person (23 years) and from an older person (78 years), both males. During the tests, brachium blood pressure (BP) and pulse signals were recorded from neck and ankle (with EMFi sensor strips). Thermal camera images were taken in order to find out temperature changes in whole body and limbs. Temporal durations and amplitudes of seat BCG:s components (systolic and diastolic) as well as from pulse signals from neck and ankle were calculated. Aortic pulse wave velocity (PWV) was obtained by utilizing the time between ECG’s R wave and maximum value of the ankle pulse signal. In both persons, the ankle pulse amplitude decreased when propagating to cold direction and increased in young person when returning to warmer ambient temperature. With young and old BCG:s systolic and diastolic temporal complexes remained stable, but systolic amplitudes increased in the older person (AHI 1.02 – 2.87, AIJ 0.7 – 2.66) as well as diastolic amplitudes (old; AKL 0.47 – 2.37). In the older person, PWV increased when moving to colder side. BP increased with a young person (from 95/64 to 132/75 mmHg), and with older person (from 125/68 to 176/101 mmHg) having a prominent rise in diastolic values during the cooling. The neck pulse wave amplitude AOP rise was modest with the younger person and had variation with the older person. Older person had also more intensive shivering compared to younger one. With the older person, the limbs stayed cold in thermal images when returning from cold to thermoneutral area. The present preliminary observations indicated clear age-related differences in the circulatory response to a mild whole-body thermal challenge.
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10.
  • Alametsä, Jarmo, et al. (författare)
  • Age‐related circulatory responses to whole body cooling: observations by heart rate variability
  • 2015
  • Ingår i: Finnish Journal of eHealth and eWelfare. - 1798-0798. ; 7:2-3, s. 57-64
  • Tidskriftsartikel (refereegranskat)abstract
    • The purpose was to study potential age ‐ related changes in the circulatory system via heart rate variability (HRV) by gradually lowering ambient temperature (0.2°C/min) from thermoneutral (32 C°) towards cold (18 C°). ECG was recorded from a young (31 years) and from an older subject (78 years), both males. During the tests, brachium blood pressure (BP) was recorded. During the cooling, BP increased in both subjects (young from 95/69 to 132/75 mmHg, old from 125/68 to 176/101 mmHg), the latter exhibiting a prominent rise in diastolic values after cooling. HRV parameters increased in both subjects during the cold exposure being modest in the younger subject as compared to the older one. Also, recovery from the cold in terms of HRV was faster in the younger subject. The present preliminary observations indicate that older age is coupled with altered HRV response to a mild whole‐body skin cooling.
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