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We investigated the effect of ovarian hormones and aging on breathing pattern [pulmonary minute ventilation $$ {\left( {\dot {V}_{{{\rm E}}}} \right)} $$ ], tidal volume (VT), breathing frequency (Fb), and respiratory sinus arrhythmia (RSA) in women. Recordings of $$ \dot {V}_{{{\rm E}}}$$ and electrocardiogram (ECG) were obtained from 23 healthy women (10 premenopausal, 13 postmenopausal)...
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