> He acknowledges that the study participants were from central Pennsylvania, so they weren’t accustomed to temperatures and humidity spiking off the charts. Some people living in typically hot and humid climates may be better able to tolerate those conditions. However, he adds, volunteers were also young and healthy, which presumably would have made them relatively more resilient: Age as well as heart conditions, diabetes, and other diseases inevitably bring the threshold down for many. For some of them, 31 Centigrade (88 Farenheit) at 90 percent humidity might be deadly.

This was not a scientifically valid study, as it preselected individuals from a cold climate.

This is nearly as bad as selecting native Inuit from Alaska and conduct a study on handling humid heat ~ pre-biased towards a specific conclusion.