View clinical trials related to Adolescent Development.
Filter by:The Jump-In study will prospectively assess the effects of impact exercise on skeletal development in young girls, including bone mass, bone mineral density, and bone geometry. We hypothesize that girls who regularly participate in impact loading exercise will accrue greater skeletal mass, increase bone density and undergo structural adaptations that in combination will improve bone strength compared to girls who do not participate in impact exercise.
Maximizing calcium retention by the skeleton within the genetic potential is a key strategy to prevent osteoporosis. It has been shown that calcium retention varies between blacks and whites and between gender within race. This study is designed to study the relationship between calcium intakes and calcium retention in Asian adolescent girls and boys. It is hypothesized that calcium intakes which maximize calcium retention will be lower in Asians than for whites studies under the same conditions. In addition it is thought that the differences between races in the physiological mechanisms involved in calcium metabolism will result in a lower calcium intake required to observe a plateau in calcium retention. This is turn could be translated into lower calcium requirements in Asians relative to Caucasians for achieving optimal peak bone mass.
This project supports the post-third-grade assessment of 693 children and their families who were enrolled in a randomized trial of a program of prenatal and infancy home visitation by nurses that was epidemiologically and theoretically grounded. The project will determine whether the beneficial effects of the program on maternal, child, and family functioning extend through the early elementary school years, giving particular attention to maternal life-course and children's emerging antisocial behavior. Assessments of the children will be based on both mother and teacher reports. Teachers are independent, natural raters of the children's adaptation to an important social context. There are numerous reasons to expect that, from a developmental perspective, the effects of the program will increase as children experience the increased academic demands associated with entry into third grade. In addressing these questions, the current study will determine the extent to which this program of prenatal and infancy home visitation by nurses can produce enduring effects on maternal and child functioning (giving particular attention to the prevention of early-onset disruptive behavior disorders) in urban African Americans that are consistent with those achieved with whites in a central New York state county in a separate trial of this program conducted over the past 20 years.