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. 2021 Jan 20;18(3):860.
doi: 10.3390/ijerph18030860.

Menstrual Cycle Phases Influence on Cardiorespiratory Response to Exercise in Endurance-Trained Females

Beatriz Rael  1 , Víctor M Alfaro-Magallanes  1 , Nuria Romero-Parra  1 , Eliane A Castro  1   2 , Rocío Cupeiro  1 , Xanne A K Janse de Jonge  3 , Erica A Wehrwein  4 , Ana B Peinado  1
Affiliations

Menstrual Cycle Phases Influence on Cardiorespiratory Response to Exercise in Endurance-Trained Females

Beatriz Rael et al. Int J Environ Res Public Health. .

Abstract

The aim of this study was to analyse the impact of sex hormone fluctuations throughout the menstrual cycle on cardiorespiratory response to high-intensity interval exercise in athletes. Twenty-one eumenorrheic endurance-trained females performed an interval running protocol in three menstrual cycle phases: early-follicular phase (EFP), late-follicular phase (LFP) and mid-luteal phase (MLP). It consisted of 8 × 3-min bouts at 85% of their maximal aerobic speed with 90-s recovery at 30% of their maximal aerobic speed. To verify menstrual cycle phase, we applied a three-step method: calendar-based counting, urinary luteinizing hormone measurement and serum hormone analysis. Mixed-linear model for repeated measures showed menstrual cycle impact on ventilatory (EFP: 78.61 ± 11.09; LFP: 76.45 ± 11.37; MLP: 78.59 ± 13.43) and heart rate (EFP: 167.29 ± 11.44; LFP: 169.89 ± 10.62; MLP: 169.89 ± 11.35) response to high-intensity interval exercise (F2.59 = 4.300; p = 0.018 and F2.61 = 4.648; p = 0.013, respectively). Oxygen consumption, carbon dioxide production, respiratory exchange ratio, breathing frequency, energy expenditure, relative perceived exertion and perceived readiness were unaltered by menstrual cycle phase. Most of the cardiorespiratory variables measured appear to be impassive by menstrual cycle phases throughout a high-intensity interval exercise in endurance-trained athletes. It seems that sex hormone fluctuations throughout the menstrual cycle are not high enough to disrupt tissues' adjustments caused by the high-intensity exercise. Nevertheless, HR based training programs should consider menstrual cycle phase.

Keywords: athletes; estradiol; eumenorrheic; high intensity interval exercise; progesterone; sex hormones.

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Conflict of interest statement

Authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Protocol of the testing procedure day. EFP: early-follicular phase; LFP: late-follicular phase; MLP: mid-luteal phase; v VO2peak: maximal aerobic speed.
Figure 2
Figure 2
Menstrual cycle phase effect (A) and time* menstrual cycle interaction (B) on performance variables in the bouts throughout the interval running protocol. Ve: ventilation; BF: breathing frequency; VO2: oxygen consumption; VCO2: carbon dioxide production; RER: respiratory exchange ratio; HR: heart rate; EE: energy expenditure; RPE: rate of perceived exertion; EFP: early-follicular phase; LFP: late-follicular phase; MLP: mid-luteal phase. # Significant differences in LFP compared to EFP.
Figure 3
Figure 3
Menstrual cycle phase effect (A) and time* menstrual cycle phase interaction (B) on performance variables in the active recoveries throughout the interval running protocol. Ve: ventilation; BF: breathing frequency; VO2: oxygen consumption; VCO2: carbon dioxide production; RER: respiratory exchange ratio; HR: heart rate; EE: energy expenditure; PR: perceived readiness; EFP: early-follicular phase; LFP: late-follicular phase; MLP: mid-luteal phase. β Significant differences in LFP compared to EFP and MLP.
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