Molecular, Genetic, and Biochemical Nutrition Commons^™

Association Between Energy Balance And Metabolic Hormone Suppression During Ultra-Endurance Exercise, Bjoern Geesmann, Jenna C. Gibbs, Joachim Mester, Karsten Koehler

Department of Nutrition and Health Sciences: Faculty Publications

Ultra-endurance athletes often accumulate an energy deficit when engaging in ultra-endurance exercise, and upon completion of the exercise, they exhibit endocrine changes that are reminiscent of starvation. However, it remains unclear whether these endocrine changes are a result of the exercise per se or secondary to the energy deficit, and more importantly, whether these changes can be attenuated by increased dietary intake. Our goal was to assess the relationship between changes in key metabolic hormones following ultra-endurance exercise and measures of energy balance. Metabolic hormones as well as energy intake and expenditure were assessed in 14 well-trained male cyclists who …

Current And Past Menstrual Status Is An Important Determinant Of Femoral Neck Geometry In Exercising Women, Rebecca J. Mallinson, Nancy I. Williams, Jenna C. Gibbs, Karsten Koehler, Heather C.M. Allaway, Emily Southmayd, M. J. De Souza

Department of Nutrition and Health Sciences: Faculty Publications

Menstrual status, both past and current, has been established as an important determinant of bone mineral density (BMD) in young exercising women. However, little is known regarding the association between the cumulative effect of menstrual status and indices of bone health beyond BMD, such as bone geometry and estimated bone strength.

Purpose: This study explores the association between cumulative menstrual status and indices of bone health assessed using dualenergy x-ray absorptiometry (DXA), including femoral neck geometry and strength and areal BMD (aBMD), in exercising women.

Methods: 101 exercising women (22.0 ± 0.4 years, BMI 21.0 ± 0.2 kg/m2, 520±40 min/week …