New research conducted by the University of Sydney and the Montreal Heart Institute has revealed some surprising findings regarding the use of electric fans in hot and humid weather. Contrary to recommendations from the Centers for Disease Control and Prevention in the US, the study showed that using a fan can actually reduce cardiac strain in older individuals.
Published in the prestigious New England Journal of Medicine, the study focused on the effectiveness of various low-cost cooling strategies for older adults, who are particularly vulnerable during hot summer weather. Professor Ollie Jay, the Director of the Heat and Health Research Center and Thermal Ergonomics Laboratory at the University of Sydney, emphasized the importance of understanding the impact of different cooling methods on the heart, especially for older adults with underlying heart conditions.
The research involved exposing older participants, both with and without heart disease, to two extreme environments—one hot and humid, and the other very hot and dry. Interestingly, the study found that in hot and humid conditions, using a fan with or without skin wetting reduced heat-induced cardiac strain. However, in very hot and dry conditions, fan use actually tripled the increase in cardiac strain, which could be dangerous for individuals with heart disease. In such conditions, skin wetting alone was found to be more effective at reducing the heart’s workload.
Dr. Daniel Gagnon from the Montreal Heart Institute, a co-author of the study, highlighted the significance of these findings, particularly for individuals who may not have access to air conditioning. The study suggests that simple, low-cost cooling strategies like using a fan and wetting the skin can be effective alternatives, depending on the weather conditions.
Dr. Georgia Chaseling, another key researcher involved in the study, emphasized the importance of these interventions for individuals in low-resource settings without access to air conditioning. The study provides valuable insights into the type of cooling strategies that should be utilized based on different weather conditions, helping older individuals stay safe during heat waves.
Overall, this collaborative research sheds light on the effectiveness of using electric fans as a cooling strategy in hot and humid weather for older adults, challenging conventional recommendations and offering practical solutions for staying cool and safe during extreme heat events. The study’s findings have the potential to inform public health initiatives and improve the well-being of vulnerable populations during periods of high heat exposure.
