Under the guidance of Dr. Fergus O'Connor, researchers analyzed how bedroom temperature affects heart rate and stress levels in elderly individuals.
“Keeping the nighttime temperature in the bedroom at 24°C for people over 65 can reduce the risk of stress responses during sleep,” noted Dr. O'Connor.
The scientist explained how heat affects the body: “When exposed to high temperatures, the body responds by increasing heart rate. The heart starts to work harder to ensure cooling through blood circulation to the skin's surface. However, this strain can create stress and hinder recovery from overheating experienced the day before.”
During the study, participants used fitness trackers that recorded heart activity data during sleep, while temperature sensors in the bedrooms continuously measured nighttime conditions throughout the Australian summer. This data provided the first real evidence of the impact of elevated temperatures on heart activity and stress levels during sleep.
Dr. O'Connor emphasized the importance of the findings in light of global climate change: “The increase in the number of hot nights may lead to a rise in cardiovascular diseases and mortality, as well as worsen sleep quality and the recovery of the autonomic nervous system.”
Additionally, the researcher pointed out a gap in existing recommendations: “While there are guidelines for maximum daytime indoor temperatures of 26°C, there are no similar recommendations for nighttime.”
