2.1. Participants and Clothing
This protocol is extracted from research article:
Can Heart Rate Variability (HRV) Be Used as a Biomarker of Thermal Comfort for Mine Workers?
Int J Environ Res Public Health, Jul 17, 2021; DOI: 10.3390/ijerph18147615

Eight male college students (an average age of 21.1 ± 0.6 years, an average height of 167.7 ± 4.9 cm, and an average weight of 63.7 ± 8.5 kg) with good health and no history of heat intolerance or respiratory or vascular diseases were recruited to participate in the study. Before the experiment, the subjects were informed about the requirements, objectives, procedure, potential risks and possible physical discomfort of the test. During the experiment, the subjects could choose to quit the test at any time. Subsequently, the two sides signed an informed consent form approved by the Ethics Committee of Guilin University of Electronics and Technology. Before the test, the subjects were forbidden to drink alcohol for 24 h, and were required not to drink tea or coffee, smoke or perform heavy exercise for at least 2 h before each test.

To make the experimental effect closer to the actual situation of the mines, the subjects were wearing shorts underneath mining overalls. The overalls, namely, a long sleeve top and trousers, were made of pure cotton with a thermal resistance of 0.164 (m2·K)/W and wet resistance of 36.12 (Pa·m2)/W.

Note: The content above has been extracted from a research article, so it may not display correctly.

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