Study of the Effects of Air Temperature and Humidity on the Human Body During Physical Exercise in the Summer

Hayakawa, Kazuyo; Isoda, Norio; Yanase, Takuko

doi:10.3130/aijax.405.0_47

Cited by 6 publications

(7 citation statements)

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“…12,13 In China, an outdoor temperature of 37°C is also the action level at which a high temperature "orange warning" alert is issued. 42 The relative humidity of 70% was selected because it is often recommended as the upper limit for thermal comfort in hot and humid environments 4,15,16 and because it can occur in indoor environments in tropical and sub-tropical climates. [9][10][11] Although temperatures >30°C at 70% RH seem excessive in the context of non-industrial indoor environments, it is argued in the Introduction section of this paper that these levels are likely to occur in buildings, especially in sub-tropical and tropical climates and during extreme heat events.…”

Section: Experimental Conditionsmentioning

confidence: 99%

“…9 Zhang et al 10 reported a field study investigating thermal comfort in a teaching building, a drawing building, and several dormitory buildings in Guangzhou, China from May 2008 to May 2009 and measured weekly mean temperatures from 28.8 to 34.6°C; the relative humidity was around 70% in summer but the measurements were interrupted during the summer holiday period, so it is to be expected that even higher temperatures and relative humidity values would otherwise have been measured. 4,[15][16][17] It thus seems reasonable to examine the impact of temperatures up to 37°C at a relative humidity of up to and above 70% on human responses even in the context of exposures in non-industrial buildings. These few examples show that temperatures in buildings can exceed the normal body core temperature of 37°C [12][13][14] and that relative humidity can also exceed the upper limit of 70% that is recommended to avoid thermal discomfort.…”

Section: Introductionmentioning

confidence: 99%

“…These few examples show that temperatures in buildings can exceed the normal body core temperature of 37°C [12][13][14] and that relative humidity can also exceed the upper limit of 70% that is recommended to avoid thermal discomfort. 4,[15][16][17] It thus seems reasonable to examine the impact of temperatures up to 37°C at a relative humidity of up to and above 70% on human responses even in the context of exposures in non-industrial buildings.…”

Section: Introductionmentioning

confidence: 99%

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Physiological and psychological reactions of sub‐tropically acclimatized subjects exposed to different indoor temperatures at a relative humidity of 70%

2018

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Thermal comfort, self‐reported acute health symptoms, cognitive performance, and physiological reactions were examined at four temperatures (26, 30, 33, and 37°C) at a relative humidity of 70%. Thirty‐two sub‐tropically acclimatized subjects experienced each condition for 175 minute, in balanced order, in a climatic chamber. The perception of heat gradually increased with increasing temperature, but the subjects felt hot only at 37°C. The temperature of 33°C was on average rated as acceptable and only just uncomfortable. The acceptability of air quality decreased linearly with increasing temperature. The intensity of acute health symptoms reported by the subjects increased with increasing temperature, but it was no more than moderate even at the highest temperature; dryness of skin and eye were alleviated. The eardrum temperature, skin temperature and moisture, heart rate, end‐tidal carbon dioxide, and weight loss increased significantly with increasing temperature, whereas the percentage of adjacent heart inter‐beat intervals differing by >50 ms decreased significantly. These results suggest that the perceived heat, self‐reported symptoms, and physiological reactions occurred concurrently. They show additionally that acclimatization to heat may shift the boundary of thermal discomfort to a higher temperature. The role of psychological adaptation and of the contextual aspects of this process still requires clarification in future experiments.

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Section: Experimental Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physiological and psychological reactions of sub‐tropically acclimatized subjects exposed to different indoor temperatures at a relative humidity of 70%

2018

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“…These studies had coupled with a larger temperature range [9,10] (e.g. from 20 o C to 34 o C [10]), moderate metabolic rate level [11][12][13] (e.g. from 0.95met to 2.94met [13]) and air velocity range [14,15] (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the widespread studies, research on identifying the effect of air humidity on thermal comfort are still far from perfect. Previous studies showed the effect of air humidity is slight within the comfort range [8,11,12,32,33]. However Nevins et al [9] studied the human thermal responses under the 72 combined temperature and humidity experimental conditions with temperatures range from 18.9°C to 27.8°C at the interval of 1.1°Cand the relative humidity range from 15% to 85% at the interval of 5%.…”

Section: Introductionmentioning

confidence: 99%

A modified method of evaluating the impact of air humidity on human acceptable air temperatures in hot-humid environments

Ming

et al. 2018

Energy and Buildings

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R. (2018) A modified method of evaluating the impact of air humidity on human acceptable air temperatures in hothumid environments. Energy and Buildings, 158. pp. 393405. ISSN 03787788 Abstract: This research aims to investigate human thermal responses to air humidity in warm and hot environments and to evaluate the effect of humidity on human thermal comfort. 20 subjects were involved in 12 exposure experiments in a well-controlled climate chamber at three relative humidity levels (40%RH, 60%RH, 80%RH) and four air temperature levels (26°C, 28°C, 30°C, 32°C) with no much indoor airflow. The physical environmental and physiological parameters as well as subjective questionnaires were collected simultaneously during the period of experiments. The results show that in hot environments, particularly when the air temperature exceeds 30°C, the relative humidity has a significant effect on human thermal responses both physiologically and subjectively. The Standard Effective Temperature (SET) is biased when evaluating human thermal comfort in the hot-humid environments without considering human thermal adaptation to humidity. Hence, a humidity correction coefficient eRH is proposed to modify the deviation of the SET under different relative humidity levels, and to quantify the effect of humidity on human acceptable air temperatures. The modified acceptable temperature-humidity zone has been obtained using the modified method.

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Effects of indoor humidity on building occupants’ thermal comfort and evidence in terms of climate adaptation

Kong

Hong

et al. 2019

Building and Environment

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Similar as temperature, air humidity may affect people's thermal comfort and humidity adaptation may happen when people changing their living conditions. To provide evidence on both effect from humidity on people's thermal comfort and their humidity adaptation, a comparative study has been conducted in a controlled climate chamber. During the experiment, the air temperature was set as 25 °C and 28 °C respectively and the relative humidity was changing between 20% and 90%. There were twenty four participants involved in this experiment, with half living in High Humidity (HH) regions of China, such as Chongqing, for over 20 years, and another half recently moved to Chongqing from Low Humidity (LH) regions in northwestern China. During the experiment, mean skin temperature was measured as objective an important parameter and subjective questionnaires were used to subjectively collect

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Study of the Effects of Air Temperature and Humidity on the Human Body During Physical Exercise in the Summer

Cited by 6 publications

References 0 publications

Physiological and psychological reactions of sub‐tropically acclimatized subjects exposed to different indoor temperatures at a relative humidity of 70%

Physiological and psychological reactions of sub‐tropically acclimatized subjects exposed to different indoor temperatures at a relative humidity of 70%

A modified method of evaluating the impact of air humidity on human acceptable air temperatures in hot-humid environments

Effects of indoor humidity on building occupants’ thermal comfort and evidence in terms of climate adaptation

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