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Journal of Sports Medicine
Volume 2013, Article ID 896821, 7 pages
http://dx.doi.org/10.1155/2013/896821
Clinical Study

The Relationship between Cortisol and Bone Mineral Density in Competitive Male Cyclists

1Vanderbilt University Medical Center, Medical Center East-South Tower, Suite 4200, Nashville, TN 37232-8774, USA
2Department of Health and Human Performance, Middle Tennessee State University, P.O. Box 96, Murfreesboro, TN 37132, USA
3Department of Psychology, Middle Tennessee State University, P.O. Box 87, Murfreesboro, TN 37132, USA
4Department of Biology, Middle Tennessee State University, P.O. Box 60, Murfreesboro, TN 37132, USA

Received 22 December 2012; Revised 10 April 2013; Accepted 14 May 2013

Academic Editor: Nancy J. Rehrer

Copyright © 2013 Shannon L. Mathis 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

Objective. The purpose of this study was to determine whether race day cortisol was related to bone mineral density (BMD) in competitive male cyclists. A secondary purpose was to determine additional factors associated with BMD in competitive male cyclists. Methods. Measurements of lumbar spine and hip BMD were performed in 35 male competitors in a state championship cycling time trial event. Salivary cortisol was measured 10 minutes prior to the start of the race and 5 minutes after race finished. Participants reported daily calcium intake, age, years of bike training, races per season, and average weekly minutes spent riding a bike, weight training, and running on a survey. Results. Cortisol level increased significantly from pre- to postcompetition but was not significantly associated with BMD. Increased weekly minutes of weight training was associated with higher BMD of the lumbar spine and the hip. The increased number of years of cycling experience was associated with lower BMD of the femoral neck. Increased daily calcium intake was associated with higher BMD of the lumbar spine and femoral neck. Conclusions. Findings indicate that cyclists should participate in weight training and increase calcium intake in order to increase or maintain BMD of the lumbar spine and hip.