This study was conducted based on the idea that presenting virtual environmental images via HMD during exercise in a hot environment may cause the brain to misunderstand the effects of such images on thermoregulation and that the misunderstanding may be used to reduce the risk of heat stroke. If this is clarified, presenting a virtual hot and cold environment as a visual stimulus by HMD during exercise in a hot environment may somehow affect the human sweating function. Finding new ways to cope with heat stroke and other diseases involving thermoregulation may be possible. Thus, we created environmental images that give several different impressions to people during exercise, played them on an HMD to create an irregular situation, and measured the body's reaction to the images. As a general trend, the results for the desert video exceeded those for the snowstorm video during the exercise. Also, the results showed significant differences from 70 to 90, 120, and 240 to 260 s (p < 0.05). The results showed significant differences between the two environments (p < 0.05), and no significant differences were observed in the amount of perspiration between the two environments. However, it is possible that the deep temperature at which sweating begins differs depending on the brightness of light entering the visual system and that circadian rhythms may be related, indicating the need for further detailed investigation.