Bone mass of female dance students prior to professional dance training: A cross-sectional study

Article Authors Metrics Comments Related Content Abstract Introduction Methods Results Discussion Conclusions Acknowledgments References Reader Comments (0) Media Coverage (0) Figures Abstract Background Professional dancers are at risk of developing low bone mineral density (BMD). However, whether low BMD phenotypes already exist in pre-vocational dance students is relatively unknown. Aim To cross-sectionally assess bone mass parameters in female dance students selected for professional dance training (first year vocational dance students) in relation to aged- and sex-matched controls. Methods 34 female selected for professional dance training (10.9yrs ±0.7) and 30 controls (11.1yrs ±0.5) were examined. Anthropometry, pubertal development (Tanner) and dietary data (3-day food diary) were recorded. BMD and bone mineral content (BMC) at forearm, femur neck (FN) and lumbar spine (LS) were assessed using Dual-Energy X-Ray Absorptiometry. Volumetric densities were estimated by calculating bone mineral apparent density (BMAD). Results Dancers were mainly at Tanner pubertal stage I (vs. stage IV in controls, p<0.001), and demonstrated significantly lower body weight (p<0.001) and height (p<0.01) than controls. Calorie intake was not different between groups, but calcium intake was significantly greater in dancers (p<0.05). Dancers revealed a significantly lower BMC and BMD values at all anatomical sites (p<0.001), and significantly lower BMAD values at the LS and FN (p<0.001). When adjusted for covariates (body weight, height, pubertal development and calcium intake), dance students continued to display a significantly lower BMD and BMAD at the FN (p<0.05; p<0.001) at the forearm (p<0.01). Conclusion Before undergoing professional dance training, first year vocational dance students demonstrated inferior bone mass compared to controls. Longitudinal models are required to assess how bone health-status changes with time throughout professional training

Promotion of breast-feeding, health, and growth among hospital-born neonates, and among infants of a rural area of Costa Rica

capítulo de libro -- Universidad de Costa Rica. Instituto de investigaciones en Salud, 1983. Publicado en Diarrhea and Malnutrition. Interactions, Mechanisms and Interventions. L.C. Chen & N.S. Scrimshaw, editors. Plenum Press, N.Y. pp. 177-202, 1983.decline in the incidence of breast-feeding in many developing nations \--as been recorded in recent years, often in conjunction with (a) rapid changes in way of life, (b) migration from rural to urban,- centers, (c) incorporation of women into the labor force (especially in industry), and (d) increase in stress, anxiety, and violence in transitional and modern societies. The marked decline in incidence and duration of breast-feeding throughout the world is a matter of international concern. The importance of breast-feeding, particularly in developing societies, stems from its health-promoting effect, as it provides the best food known for infants, protects the child against a variety of debilitating infectious processes, and encourages attachment between mother and infant.' Furthermore, successful breast-feeding indirectly reduces the ills of bottle- feeding, especially in developing nations, as epidemiological observation in many countries has revealed that early weaning is often associated with severe infant malnutrition, neglect, child abuse, abandonment, and premature deathUniversidad de Costa Rica.UCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias de la Salud::Instituto de Investigaciones en Salud (INISA