In chilly temperatures around 10°C (50°F), endurance performance has been shown to improve in certain circumstances. Such reactions suggest the involvement of the Sympathetic Adrenal-Medullary (SAM) system, a stress response pathway. Further performance decline can be attributed to mental fatigue caused by psychological pressure, which leads to decreased motivation and increased fatigue. However, the simultaneous effects of cold and mental fatigue have rarely been studied. “Going forward, we will establish specific methods to minimize the effects of cold stress and mental fatigue.