Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2008) 07, 475 - 479

Research article
Effects of the Menstrual Cycle on Expiratory Resistance During Whole Body Exercise in Females
Alethea J. Anderson, Mark A. Babcock 
Author Information
Department of Kinesiology and Physical Education, Wilfrid Laurier University, Waterloo, ON. Canada

Mark A. Babcock
✉ Department of Kinesiology and Physical Education, Wilfrid Laurier University, 75 University Ave., Waterloo, ON. Canada N2L 3C5
Email: mbabcock93@yahoo.ca
Publish Date
Received: 07-02-2008
Accepted: 05-09-2008
Published (online): 01-12-2008
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ABSTRACT

Our objective was to determine if the menstrual cycle affected expiratory resistance developed during progressive incremental exercise in females. Eleven females (age = 19.7 ± 1.1 yr., body mass = 58.9 ± 8.8 Kg, height = 1.65 ± 0.3 m) gave consent to participate in the study. Participants were studied during the follicular (day 7 ± 2 days following onset of menses) and luteal (day 21 ± 2 days following onset of menses) phases of their menstrual cycle. The expiratory resistance was significantly higher during the follicular phase at maximal workload versus the luteal phase (1.0 ± 0.06 cm H2O/L/sec vs. 0.9 ± 0.07 cm H2O/L/sec.: p¼ 0.05). No other differences were found in expiratory resistance, oxygen uptake or maximal heart rate during exercise. Results showed that the increase in expiratory resistance during the follicular phase of the menstrual cycle may be contributing to the changes in the pulmonary system of females as reported by other authors.

Key words: airway resistance, female, menstrual cycle, exercise


           Key Points
  • During maximal exercise there was a significantly larger expiratory resistance during the follicular phase versus luteal phase of the female subjects menstrual cycle.
  • Fluctuation in hormones (especially progesterone and/ or oestrogen) may contribute to changes in expiratory resistance.
  • The increased expiratory resistance may be a contributing factor to the increased occurrence of expiratory flow limitation in female subjects.
 
 
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