Re: Insidence of hip fractures in different countriesIf my memory serves, African diets are often quite low in
calcium to the point that rickets can be the result of calcium
dietary deficiency instead of low vitamin D levels.
On Jun 21, 11:02 pm, "Juhana Harju" <n...@mail.fi> wrote:
> Juhana Harju wrote:
> > ron wrote:
>
> >> Shorter lifetimes must play a significant role and wher, hopefully,
> >> factored out of the study.
>
> > Sure.
>
> It is quite interesting that fracture risk can be low in spite of low BMD
> and BMC as in Gambia.
>
> J Bone Miner Res. 1996 Jul;11(7):1019-25.
> Low bone mineral content is common but osteoporotic fractures are rare in
> elderly rural Gambian women.
> Aspray TJ, Prentice A, Cole TJ, Sawo Y, Reeve J, Francis RM.
> MRC Dunn Nutrition Unit, Keneba, The Gambia.
>
> Osteoporosis is reported to be rare in Black Africa. The low fracture
> incidence among North American black women is explained by a high peak bone
> mass and preservation of bone mineral into old age. To assess whether this
> is the case among Black African women, we measured bone mineral content
> (BMC) and bone mineral density (BMD), using single- and dual-photon
> absorptiometry, in 195 rural Gambian women aged over 44 years and 391 white
> women of comparable age from three centers in the U.K. Measurements were
> made at the midshaft of the radius, distal radius, lumbar spine, and femoral
> neck. The influence of height, weight, and nationality on BMC and BMD was
> analyzed. BMC and BMD decreased with age at all sites. Age, decreasing
> weight, but not height were independently associated with lower BMC at all
> sites. BMC in Gambian women was lower than in British women by 31% at the
> lumbar spine and 16% at the midshaft of the radius. After adjustment for
> age, height, and weight, BMC among Gambian women remained 24% lower at the
> lumbar spine and 10% lower at the radius. In women aged over 64 years, BMC
> at the lumbar spine was 42% lower and BMD was 31% lower in The Gambia (for
> all comparisons, p < 0.005). We conclude that bone mineral mass is not
> preserved in elderly Gambian women. However, minimal trauma fractures are
> rare in this population. These results challenge the concept of BMC as a
> primary determinant of fracture risk. PMID: 8797124
>
> * tinyurl . com /26lxa3
>
> --
> Juhana