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Variations in strength-related measures during the menstrual cycle in eumenorrheic women: A systematic review and meta-analysis

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journal contribution
posted on 20.05.2020, 13:27 by Richard BlagroveRichard Blagrove, Georgie Bruinvels, Charles R Pedlar
Objectives: To systematically review the current body of research that has investigated changes in strength-related variables during different phases of the menstrual cycle in eumenorrheic women. Design: Systematic review and meta analysis. Method: A literature search was conducted in Pubmed, SPORTDiscus and Web of Science using search terms related to the menstrual cycle and strength-related measures. Two reviewers reached consensus that 21 studies met the criteria for inclusion. Methodological rigor was assessed using the Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies. Random effects meta-analyses were used to compare the early-follicular, ovulatory and mid-luteal phases for maximal voluntary contraction, isokinetic peak torque, and explosive strength. Results: The assessment of study quality showed that a high level of bias exists in specific areas of study design. Non-significant and small or trivial effect sizes (p≥0.26, Hedges g ≤0.35) were identified for all strength related variables in each comparison between phases. 95% confidence intervals for each comparison suggested the uncertainty associated with each estimate extends to a small effect on strength performance with unclear direction (-0.42≤ g ≤0.48). The heterogeneity for each comparison was also small (p≥0.83, I 2 =0%). Conclusions: Strength status appears to be minimally altered (g ≤0.35) by the fluctuations in ovarian sex hormones that occur during the menstrual cycle. This finding should be interpreted with caution due to the methodological shortcomings identified by the quality assessment.

History

School

  • Sport, Exercise and Health Sciences

Published in

Journal of Science and Medicine in Sport

Volume

23

Issue

12

Pages

1220-1227

Publisher

Elsevier BV

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Journal of Science and Medicine in Sport and the definitive published version is available at https://doi.org/10.1016/j.jsams.2020.04.022

Acceptance date

30/04/2020

Publication date

2020-05-17

Copyright date

2020

ISSN

1440-2440

Language

en

Depositor

Dr Richard Blagrove. Deposit date: 18 May 2020