Blood pressure and limb blood flow responses during hyperpnoea are not affected by menstrual cycle phase in young women

Publication date: Available online 13 January 2020Source: Respiratory Physiology & NeurobiologyAuthor(s): Kaori Shimizu, Kana Shiozawa, Koji Ishida, Mitsuru Saito, Sahiro Mizuno, Hiroshi Akima, Keisho KatayamaAbstractThe purpose of this study was to clarify whether the menstrual cycle affects the cardiovascular and limb blood flow responses during hyperpnoea. Fifteen young female subjects participated. An incremental respiratory endurance test was performed at the early follicular (EF) and midluteal phases (ML). Target minute ventilation was initially set at 30% of maximal voluntary ventilation (MVV12) and was increased by 10%MVV12 every 3 min. The test was terminated when the subjects no longer maintained the target ventilation. Mean arterial blood pressure (MBP) and mean blood flow in the brachial artery were continuously measured. There were no significant differences in the increase in MBP (EF: +13.0 ± 7.9 mmHg vs. + 15.4 ± 12.9 mmHg during the test, F = 0.70, P = 0.59) and the decrease in brachial blood flow between the phases. These results suggest that menstrual cycle does not affect respiratory muscle-induced metaboreflex in young women.
Source: Respiratory Physiology and Neurobiology - Category: Respiratory Medicine Source Type: research