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BioMed Research International
Volume 2013 (2013), Article ID 243572, 6 pages
http://dx.doi.org/10.1155/2013/243572
Research Article

Effects of Estrogen Fluctuation during the Menstrual Cycle on the Response to Stretch-Shortening Exercise in Females

1Department of Applied Physiology and Kinesiotherapy, Lithuanian Sports University, Sporto 6, 44221 Kaunas, Lithuania
2Department of Physical Education, Kaunas University of Technology, K. Donelaičio g. 73, LT-44029 Kaunas, Lithuania
3Research Center for Fundamental and Clinical Movement Science, Lithuanian Sports University, Sporto 6, 44221 Kaunas, Lithuania

Received 19 April 2013; Revised 16 August 2013; Accepted 16 August 2013

Academic Editor: Jón Karlsson

Copyright © 2013 Saulė Sipavičienė et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study was to investigate whether variation in estrogen levels during the menstrual cycle influences susceptibility to exercise-induced muscle damage after stretch-shortening cycle exercise. Physically active women ( ; age = 20.2 ± 1.7 yr) participated in this research. The subjects performed one session of 100 maximal drop jumps on day 1 or 2 of the follicular phase and another identical session on day 1 or 2 of the ovulatory phase; the order of the sessions was randomized. Quadriceps femoris muscle peak torque evoked by electrical stimulation and maximal voluntary contraction, muscle pain, and CK activity were measured before and at various times up to 72 h after exercise. It was found that the high estrogen level during the ovulatory phase might be related to an earlier return to baseline muscle strength after strenuous stretch-shortening cycle exercise in that phase compared with the follicular phase. The estrogen effect appears to be highly specific to the damaged site because the differences in most EIMD markers (CK, soreness, and low-frequency fatigue) between the two menstrual cycle phases were small.