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Clinical Trial
. 2016 Sep 6;316(9):989-91.
doi: 10.1001/jama.2016.10550.

Cardiac and Thermal Strain of Elderly Adults Exposed to Extreme Heat and Humidity With and Without Electric Fan Use

Daniel Gagnon  1 , Steven A Romero  1 , Matthew N Cramer  1 , Ollie Jay  2 , Craig G Crandall  1
Affiliations
Clinical Trial

Cardiac and Thermal Strain of Elderly Adults Exposed to Extreme Heat and Humidity With and Without Electric Fan Use

Daniel Gagnon et al. JAMA. .
No abstract available

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Conflict of interest statement

Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.

Figures

Figure 1
Figure 1. Critical Humidity Inflection Points for Heart Rate and Core Temperature
A, The critical humidity at which rapid elevations in heart rate and core temperature occurred was evaluated in elderly adults exposed to stepwise increases in relative humidity while resting at 42°C. The protocol was performed without and with fan use. B, Error bars indicate 95% confidence intervals. The horizontal line indicates the mean. The inflection points for heart rate (P = .68) and core temperature (P = .11) did not differ between conditions.
Figure 2
Figure 2. Heart Rate and Core Temperature During the Protocol
Elderly adults were exposed to stepwise increases in relative humidity while resting at 42°C. The protocol was performed without and with fan use (randomized). A significant condition × relative humidity interaction was observed for heart rate and core temperature (both P < .001). Fan use resulted in greater heart rate and core temperature, but the magnitude of difference between conditions generally became less as relative humidity increased. Error bars indicate 95%confidence intervals. Data markers indicate mean values.
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