Gravidity studies have intimated a relationship between serum relaxin levels and joint laxity. To assess its applicability to eumenorrheic athletes, weekly serum relaxin and knee arthrometry measurements were obtained in 57 collegiate women and 5 men for 4 consecutive weeks. The former included athletes, ACL-injured athletes, and nonathletes, while the latter formed an a priori hormonal control. Analysis of variance revealed a significant change in weekly serum relaxin levels in females but not in anterior translation. Regression analysis failed to disclose a relationship between these variables. Therefore, we conclude relaxin does not affect knee laxity.
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Arnold et al. (2002) studied this question.
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