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Women—An Open Access Journal
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Serum Creatine Kinase Increases after Acute Strength Training in College Athletes with Menstrual Irregularities

1
Research Institute of Physical Fitness, Japan Women’s College of Physical Education, Tokyo 163-8001, Japan
2
Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki 305-8577, Japan
3
Faculty of Medicine, University of Tsukuba, Ibaraki 305-8577, Japan
4
Center for General Education, Tokyo Keizai University, Tokyo 163-8001, Japan
5
International Medical Center, University of Tsukuba Affiliated Hospital, Ibaraki 305-8576, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Lynda B. Ransdell
Women 2021, 1(2), 71-79; https://doi.org/10.3390/women1020007
Received: 15 February 2021 / Revised: 25 March 2021 / Accepted: 26 March 2021 / Published: 9 April 2021
Chronic menstrual dysfunction and low female sex hormones adversely affect muscular performance in women but studies in college athletes are scarce. A cohort of 18 Japanese, female college athletes at the University of Tsukuba, Japan, were recruited and studied over 3 weeks under 2 conditions. One group had normal menstrual cycling (CYC, 9 athletes) while the other had irregular cycles (DYS, 9 athletes). Hormones and creatine kinase (CK) were measured from blood under both rest (RE) and exercise (EX) conditions. Biceps femoris tendon stiffness was measured by myometry. No differences in age, height, weight, menarche age, or one-repetition maximum weight existed between the groups. The DYS group had persistently low levels of estrogen and progesterone. In the CYC group, the CK level significantly increased at each point immediately post-exercise and 24 h post-exercise compared to pre-exercise in Weeks 1 and 2, and significantly increased at 24 h post-exercise compared to pre-exercise status in Week 3. The DYS group was significantly different only between pre-exercise and 24 h post-exercise over all 3 weeks. The DYS group also suffered from higher biceps femoris tendon stiffness at 24 h post-exercise. Chronic menstrual irregularities in Japanese college athletes increase muscle damage markers in the bloodstream and muscle stiffness after acute strength training. View Full-Text
Keywords: menstrual status; female athletes; creatine kinase; Japanese menstrual status; female athletes; creatine kinase; Japanese
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MDPI and ACS Style

Sawai, A.; Mitsuhashi, R.; Zaboronok, A.; Warashina, Y.; Mathis, B.J. Serum Creatine Kinase Increases after Acute Strength Training in College Athletes with Menstrual Irregularities. Women 2021, 1, 71-79. https://doi.org/10.3390/women1020007

AMA Style

Sawai A, Mitsuhashi R, Zaboronok A, Warashina Y, Mathis BJ. Serum Creatine Kinase Increases after Acute Strength Training in College Athletes with Menstrual Irregularities. Women. 2021; 1(2):71-79. https://doi.org/10.3390/women1020007

Chicago/Turabian Style

Sawai, Akemi, Risa Mitsuhashi, Alexander Zaboronok, Yuki Warashina, and Bryan J. Mathis 2021. "Serum Creatine Kinase Increases after Acute Strength Training in College Athletes with Menstrual Irregularities" Women 1, no. 2: 71-79. https://doi.org/10.3390/women1020007

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