Document Detail

Effects of the menstrual cycle on timing and depth of breathing at rest.
MedLine Citation:
PMID:  10874350     Owner:  NLM     Status:  MEDLINE    
Volume and timing components of resting ventilation were measured serially in 40 women aged 18 to 36 yr, during menstrual, follicular and luteal phases of menstrual cycle. Resting minute ventilation (VE) was significantly higher (P < 0.001) in luteal phase than in menstrual and follicular phases; in the two latter phases VE was almost equal. This increment in VE during the luteal phase was due to a significant rise (P < 0.001) in tidal volume (VT). Respiratory frequency (f) was unchanged throughout the cycle. Although there was a mean increases in inspiratory time (T1) during the luteal phase compared to the other two phases, the difference did not reach statistical significance. Duty cycle, T1/Ttot, was also unchanged throughout menstrual cycle. However, mean inspiratory flow, VT/T1, was significantly higher (P < 0.05 and P < 0.01) during luteal phase as compared to that during menstrual or follicular phases respectively. Pulmonary mechanics, as measured by forced vital capacity (FVC), forced expiratory volume in one second (FEV1) and forced mid expiratory flow rate (FEF25%, 75%), were within normal limits and remained unaltered during the menstrual cycle. Therefore, in the absence of alteration of pulmonary mechanics, the luteal increase in ventilation and inspiratory flow suggests a possible role for progesterone in stimulating the respiratory drive, either centrally or through the peripheral chemoreceptors or by both.
T K Das
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Indian journal of physiology and pharmacology     Volume:  42     ISSN:  0019-5499     ISO Abbreviation:  Indian J. Physiol. Pharmacol.     Publication Date:  1998 Oct 
Date Detail:
Created Date:  2000-07-19     Completed Date:  2000-07-19     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0374707     Medline TA:  Indian J Physiol Pharmacol     Country:  INDIA    
Other Details:
Languages:  eng     Pagination:  498-502     Citation Subset:  IM    
Department of Physiology, Medical College, Baroda.
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MeSH Terms
Follicular Phase / physiology*
Luteal Phase / physiology*
Menstruation / physiology
Pulmonary Ventilation / physiology*
Rest / physiology

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