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Title: Changes in peak expiratory flow and respiratory strength during the menstrual cycle
Authors: Silva, Selma Bruno da
Viana, Elizabel de Sousa Ramalho
Sousa, Maria Bernardete Cordeiro de
Keywords: Breathing control;Respiratory pressure;Female hormones;Sex steroids;Controle da respiração;Hormônios femininos;Esteróides sexuais
Issue Date: 2006
Publisher: Respiratory Physiology & Neurobiology
Citation: SILVA, S. B.da ; VIANA, E de S. R. ; SOUSA, M. B. C. de . Changes in peak expiratory flow and respiratory strength during the menstrual cycle. Respiratory Physiology and Neurobiology , Estados Unidos, v. 150, n. 2-3, p. 211-219, 2006
Abstract: This study evaluated the spirometry and respiratory static pressures in 17 young women, twice a week for three successive ovulatory menstrual cycles to determine if such variables changed across the menstrual, follicular, periovulatory, early-tomid luteal and late luteal phases. The factors phases of menstrual cycle and individual cycles had no significant effect on the spirometry variables except for peak expiratory flow (PEF) and respiratory static pressures. Significant weak positive correlations were found between the progesterone:estradiol ratio and PEF and between estrogen and tidal volume (r = 0.37), inspiratory time (r = 0.22), expiratory time (r = 0.19), maximal inspiratory pressure (r = 0.25) and maximal expiratory pressure (r = 0.20) and for progesterone and maximal inspiratory pressure (r = 0.32) during the early-to-mid luteal phase. Although most parameters of the spirometry results did not change during the menstrual cycle, the correlations observed between sexual hormones and respiratory control variables suggest a positive influence of sexual female hormones controlling the thoracic pump muscles in the luteal phase
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