Understanding Bone Health: The Role of Growth in Childhood and Early Adulthood

The Importance of Bone Mass and Density

Long-term bone health relies significantly on the bone mass and density established during childhood and early adulthood. However, it is important to note that height growth does not occur at the same rate as bone mass growth. This discrepancy may increase the risk of fractures among children.

Study Overview by McCormack and Colleagues

To elucidate the relationship between growth, bone mass, and overall bone health, McCormack and colleagues conducted a longitudinal study published in JAMA Pediatrics. The study involved 2014 healthy children from across the United States, who were aged between 5 and 19 years when they entered the research. Participants were evaluated annually for a duration of up to 7 years.

Demographics and Methodology

The study maintained an equal distribution of participants by sex, with 23.8% identifying as African American. Researchers collected data on height, weight, pubertal status, and body mass index percentiles. Additionally, specialized X-ray scans were employed to measure bone density at various body locations. Each participant also reported any fractures experienced during the study period.

Growth Patterns in African American Children

Findings revealed that African American boys and girls tend to grow at a significantly faster rate than their non-African American peers. Boys typically achieve the highest bone mineral content around the age of 14, while girls reach this peak at approximately 12 years old. Notably, up to 11% of bone mineral density can be acquired during late adolescence, even after reaching adult height. During earlier growth phases, height increases tend to outpace bone density growth, resulting in a heightened fracture risk.

Linking Puberty to Bone Growth

Both height and bone mineral density increases are closely associated with the onset of puberty. Earlier onset of puberty correlates with accelerated growth rates. Furthermore, bone loss may begin in early adulthood, immediately following the completion of bone growth.

Implications of the Findings

The implications of this study are significant, highlighting the critical window during late adolescence for nutritional interventions aimed at optimizing bone mass. This research clarifies the patterns of bone growth and their connection to bone health in children and young adults.

Future Research Directions

Further studies are necessary to follow participants into older adulthood to better understand how early growth patterns influence the risk of osteoporosis and other bone-related diseases later in life.

Reference

McCormack et al. 2017. Association between linear growth and bone accrual in a diverse cohort of children and adolescents. JAMA Pediatrics.