Study to Determine How Exercise and Calcium Affect Pubertal Bone

Effect of Exercise and Calcium Foods on Pubertal Bone Gain

To determine if increasing the amount of calcium that girls eat or the degree of exercise in which they participate will increase their bone strength.

Inclusion Criteria:

• 9-10 years of age
• Premenarcheal
• Female

Exclusion Criteria:

• corticosteroid or anticonvulsant therapy
• lactose intolerance or milk allergy
• family history of hypercholesterolemia
• mental or physical handicaps
• chronic disease
• body mass index ³ 85th percentile for age and gender
• baseline calcium intake of > 1100 mg/day
• participation in team sports > 3 times per week