The Experts below are selected from a list of 4602 Experts worldwide ranked by ideXlab platform
George Havenith - One of the best experts on this subject based on the ideXlab platform.
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Comment on: Subjective thermal strain impairs endurance performance in a Temperate Environment.
Physiology & behavior, 2019Co-Authors: Alex Lloyd, George HavenithAbstract:Comment on: Subjective thermal strain impairs endurance performance in a Temperate Environment
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Ethnic differences in thermal responses and comfort sensation between Japanese and Caucasian young males under a Temperate Environment
2012Co-Authors: Takako Fukazawa, George HavenithAbstract:This study has been made to examine ethnic differences in thermal responses and human thermal comfort sensation between Japanese and Caucasians under a Temperate Environment. Young healthy Japanese and Caucasian males voluntary participated in the present study. In the study, they firstly kept a rest condition and walked on a treadmill in the exercise condition. Japanese showed significantly higher mean skin temperature than Caucasian during a whole period of the experiment. Although the water vapour pressure over the skin surface during the rest was statistically slightly higher in Caucasian than in Japanese, calculated evaporation rate from the body surface in Japanese was significantly larger than that in Caucasians. This was because the temperature difference between the skin surface and the Environment was larger in Japanese than in Caucasians. Calculated evaporation rate from the body surface during the exercise was found to be significantly larger in Japanese than in Caucasian because both of temperature and water vapour pressure of the skin surface showed remarkably higher values in Japanese than in Caucasians. Thermal comfort limit was discussed using skin wettedness based on linearity between the voted thermal comfort sensation and skin wettedness. The thermal comfort limits of the whole body were 0.39 ±0.05 in Japanese, and O.34 .± 03 in Caucasians. The thermal comfort limit in Japanese was found to be statistically equal to that in Caucasian.
Samuele Maria Marcora - One of the best experts on this subject based on the ideXlab platform.
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Subjective thermal strain impairs endurance performance in a Temperate Environment.
Physiology & behavior, 2019Co-Authors: Jeroen Van Cutsem, Bart Roelands, Kevin De Pauw, Romain Meeusen, Samuele Maria MarcoraAbstract:Abstract Purpose The aim of this study was to test the hypothesis that subjective thermal strain can reduce endurance performance independently from the general physiological strain normally associated with impaired endurance performance in the heat. Methods In 20 °C and 44% relative humidity, 12 endurance-trained athletes (1♀ 11♂; mean ± SD; age: 27 ± 6 y; VO2max: 61 ± 6 ml/kg/min) performed a time to exhaustion (TTE) test in two different experimental conditions: with an electric heat pad applied to the subjects' upper back (HP) and control (CON: without heat pad). In both conditions, subjects cycled to volitional exhaustion at 70% of their VO2max. Cardiorespiratory, metabolic, thermoregulatory and perceptual responses were measured throughout the TTE test and compared at 0%, 50% and 100% isotime and at exhaustion. Results TTE was reduced by 9% in HP (2092 ± 305 s) compared to CON (2292 ± 344 s; p = .023). The main effect of condition on thermal discomfort at isotime (p = .002), the effect of condition on thermal sensation at 0% isotime (p = .004) and the condition by isotime interaction on rating of perceived exertion (p = .036) indicated higher subjective thermal strain in HP compared to CON. None of the measured cardiorespiratory, metabolic and thermoregulatory variables differed significantly between conditions. Conclusion Our novel experimental manipulation (HP) was able to induce significant subjective thermal strain and reduce endurance performance in a Temperate Environment without inducing the general physiological strain normally associated with impaired endurance performance in the heat. These results suggest that subjective thermal strain is an important and independent mediator of the heat-induced impairment in endurance performance.
Alex Lloyd - One of the best experts on this subject based on the ideXlab platform.
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Comment on: Subjective thermal strain impairs endurance performance in a Temperate Environment.
Physiology & behavior, 2019Co-Authors: Alex Lloyd, George HavenithAbstract:Comment on: Subjective thermal strain impairs endurance performance in a Temperate Environment
Jeroen Van Cutsem - One of the best experts on this subject based on the ideXlab platform.
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Subjective thermal strain impairs endurance performance in a Temperate Environment.
Physiology & behavior, 2019Co-Authors: Jeroen Van Cutsem, Bart Roelands, Kevin De Pauw, Romain Meeusen, Samuele Maria MarcoraAbstract:Abstract Purpose The aim of this study was to test the hypothesis that subjective thermal strain can reduce endurance performance independently from the general physiological strain normally associated with impaired endurance performance in the heat. Methods In 20 °C and 44% relative humidity, 12 endurance-trained athletes (1♀ 11♂; mean ± SD; age: 27 ± 6 y; VO2max: 61 ± 6 ml/kg/min) performed a time to exhaustion (TTE) test in two different experimental conditions: with an electric heat pad applied to the subjects' upper back (HP) and control (CON: without heat pad). In both conditions, subjects cycled to volitional exhaustion at 70% of their VO2max. Cardiorespiratory, metabolic, thermoregulatory and perceptual responses were measured throughout the TTE test and compared at 0%, 50% and 100% isotime and at exhaustion. Results TTE was reduced by 9% in HP (2092 ± 305 s) compared to CON (2292 ± 344 s; p = .023). The main effect of condition on thermal discomfort at isotime (p = .002), the effect of condition on thermal sensation at 0% isotime (p = .004) and the condition by isotime interaction on rating of perceived exertion (p = .036) indicated higher subjective thermal strain in HP compared to CON. None of the measured cardiorespiratory, metabolic and thermoregulatory variables differed significantly between conditions. Conclusion Our novel experimental manipulation (HP) was able to induce significant subjective thermal strain and reduce endurance performance in a Temperate Environment without inducing the general physiological strain normally associated with impaired endurance performance in the heat. These results suggest that subjective thermal strain is an important and independent mediator of the heat-induced impairment in endurance performance.
Tim Hess - One of the best experts on this subject based on the ideXlab platform.
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Estimating Green Water Footprints in a Temperate Environment
Water, 2010Co-Authors: Tim HessAbstract:Abstract: The “green” water footprint (GWF) of a product is often considered less important than the “blue” water footprint (BWF) as “green” water generally has a low, or even negligible, opportunity cost. However, when considering food, fibre and tree products, is not only a useful indicator of the total appropriation of a natural resource, but from a methodological perspective, blue water footprints are frequently estimated as the residual after green water is subtracted from total crop water use. In most published studies, green water use (ET green ) has been estimated from the FAO CROPWAT model using the USDA method for effective rainfall. In this study, four methods for the estimation of the ET green of pasture were compared. Two were based on effective rainfall estimated from monthly rainfall and potential evapotranspiration, and two were based on a simulated water balance using long-term daily, or average monthly, weather data from 11 stations in England. The results show that the effective rainfall methods significantly underestimate the annual ET
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estimating green water footprints in a Temperate Environment
Water, 2010Co-Authors: Tim HessAbstract:The “green” water footprint (GWF) of a product is often considered less important than the “blue” water footprint (BWF) as “green” water generally has a low, or even negligible, opportunity cost. However, when considering food, fibre and tree products, is not only a useful indicator of the total appropriation of a natural resource, but from a methodological perspective, blue water footprints are frequently estimated as the residual after green water is subtracted from total crop water use. In most published studies, green water use (ETgreen) has been estimated from the FAO CROPWAT model using the USDA method for effective rainfall. In this study, four methods for the estimation of the ETgreen of pasture were compared. Two were based on effective rainfall estimated from monthly rainfall and potential evapotranspiration, and two were based on a simulated water balance using long-term daily, or average monthly, weather data from 11 stations in England. The results show that the effective rainfall methods significantly underestimate the annual ETgreen in all cases, as they do not adequately account for the depletion of stored soil water during the summer. A simplified model, based on annual rainfall and reference evapotranspiration (ETo) has been tested and used to map the average annual ETgreen of pasture in England.
