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The Journal of Sports Medicine and Physical Fitness 2007 June;47(2):255-60

Copyright © 2007 EDIZIONI MINERVA MEDICA

lingua: Inglese

Menstrual cycle stage and oral contraceptive effects on anterior tibial displacement in collegiate female athletes

Hicks-Little C. A. 1, Thatcher J. R. 2, Hauth J. M. 2, Goldfuss A. J. 2, Cordova M. L. 1

1 Biodynamics Research Laboratory, Department of Kinesiology The University of North Carolina, Charlotte, NC, USA 2 Department of Athletic Training, East Stroudsburg University East Stroudsburg PA, USA


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Aim. The aim of this study was to establish if differences in anterior tibial displacement exists in collegiate female student-athletes at different stages of the menstrual cycle.
Methods. Design and setting: a 2 x 3 factorial design with repeated measures on the second factor guided this study. The first independent variable was group with 2 levels (control and oral contraceptive) and the second independent variable was menstrual cycle phase with 3 levels (follicular, ovulation, luteal). The single dependent variable was anterior tibial displacement. All data were collected in a research laboratory. Subjects: 53 female student athletes (control: n=28; oral contraceptive: n=25) with no previous history of knee injury or anomalies with a normal 28-30 day menstrual cycle participated. Measurements: anterior tibial displacement (mm) measurements were taken on days 1 (follicular phase), 13 (ovulation phase), and 23 (luteal phase) of each subject’s menstrual cycle using a KT1000™ knee arthrometer.
Results. For the entire group, statistically significant increases in anterior tibial laxity were found (F=4.49; df=52.1; P<0.05) between the follicular cycle (0±SD =5.14 mm) and ovulation cycle (0±SD=5.81 mm); and follicular cycle (0±SD=5.14 mm) and luteal cycle (0±SD=5.79 mm). A separate analysis of the non-birth control group revealed no significant difference in anterior tibial laxity throughout the stages of the menstrual cycle.
Conclusion. The results of this study suggest that: 1) the menstrual cycle does have an influence on laxity of the anterior displacement of the knee; 2) significant increases in anterior displacement are shown during the ovulation and luteal phases of the menstrual cycle; and 3) birth control subjects tend to have increased laxity when compared to those subjects who are not on hormone therapy.

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