Dear Editor in Chief: Several studies have suggested that respiratory function is influenced by female sexual hormones.
Considering a normal 28-day menstrual cycle, three phases can be distinguished: menstrual, follicular and luteal. Respiratory function is influenced by female sexual hormones, which could increase ventilatory response during the luteal phase. In contrast, no changes for pulmonary capacities, flows and volumes evaluated by spirometry were found in other investigations…