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Simulations with a computer model suggest that the singers can, among others, only produce their highest frequencies with a greatly increased tension in the vocal folds, supported by high expiratory air pressures.

Ristenpart stated in a report in Science Daily that "It's really shocking to most virologists and epidemiologists that airborne dust, rather than expiratory droplets, can carry influenza virus capable of infecting animals."

They found six associations related to a person’s ability to force air out of the lungs – otherwise known as forced expiratory volume in the scientific community – in both groups of people.

The forced expiratory volume test measures lung function by calculating the volume of air exhaled by a person during a forced exhalation.

If this theory is true, it helps us in explaining why the large, mediate, and smaller bronchi are closed during the expiratory stage of the paroxysmal cough of pertussis.