Bone mineral density in 11–13-year-old boys: relative importance of the weight status and body composition factors

Abstract

This study was aimed to investigate the influence of being overweight on bone mineral status in 11-13-year-old boys, who were divided into overweight (OW; n = 110) and normal weight (NW; n = 154) groups. Bone mineral density (BMD) at the whole body (WB), lumbar spine (LS) and femoral neck (FN), bone mineral content (BMC) at the WB, and body composition were assessed. Calculation of the bone mineral apparent density (BMAD) was completed for the WB, LS and FN. The BMC/height ratio was also computed. OW boys displayed similar values (P > 0.05) for LS and FN BMAD and lower (P < 0.05) WB BMAD, despite significantly higher values (P < 0.05) for more widely used WB and LS BMD, WB BMC and WB BMC/height in comparison with NW boys. Fat-free mass index (FFMI; kg/m(2)) had the highest correlation coefficients from the calculated body composition indices with all bone mineral values in NW boys. In OW boys, the FFMI had the highest correlation only with FN BMD, while other measured bone mineral values had highest correlations with either BMI or FMI indices. In conclusion, OW boys have higher crude WB BMD, BMC and BMC/height ratio in comparison with NW boys. However, the bone growth appears to be insufficient to compensate for the higher mechanical load applied on the bone by higher FM and also FFM values in OW boys. Excessive adiposity does not have a protective effect on the development of BMAD in growing boys reaching puberty.

Relationship between physical activity, dietary intake and bone parameters in 10-12 years old Hungarian boys and girls

“…These results are consistent with some studies (8,9). A previous study reported that overweight prepubertal boys had better DEXA bone parameters than that of boys with normal nutritional status (24). In our study body fat percentage did not correlate significantly to QUS in boys but did in 10-12 years old girls: a positive correlation was found between fat percentage and BUA, despite the fact that the fat% did not significantly differ between the genders in this sample.…”

Associations between Bone Mineral Characteristics and Serum Levels of Ghrelin and Peptide YY in Overweight Adolescent Boys

“…Only the serum testosterone levels were significantly lower and the leptin levels significantly higher in the OWB compared to the NWB group. Our results showed that all bone mineral characteristics of the OWB group, except TB BMAD, were significantly higher than those of the NWB group, similar to findings published before [1,7]. …”

“…Body mass is one of the strongest predictors of BMD [2,3]. Body fat mass (FM) and fat-free mass (FFM) are both positively correlated with BMD before puberty [4,5,6] as well as during pubertal development [7,8] and in adolescence [5,9]. However, in obese children an opposite picture has been seen, namely obese children have lower BMD when adjusting for their body size [10,11].…”

Frequency and duration of vigorous physical activity bouts are associated with adolescent boys' bone mineral status: A cross-sectional study

“…Vigorous weight-bearing physical activity (VPA) seems to be the most effective intensity for bone growth [22,23], even though some associations have been found among bone mineral parameters and total, light or moderate PA as well, whereas the negative influence of sedentary time has been observed [24,25].…”