Bone mineral content in St. Lawrence Island Eskimos.

摘要: Bone mineral content (BMC) of the radius was determined for 117 male and 124 female St. Lawrence Island Eskimos volunteers using a Norland-Cameron bone analyzer with an 125I source. Results this study support earlier findings showing low BMC in northern compared to Wisconsin Whites. In particular, lose starting at ages greater rate than other populations. For males over age 50, change is -5.8% per decade average loss 4.0% White samples. The decrease Eskimo females older 45 much males. diminution 13.9% contrasted -10.0% females. Compared north Alaska Inupiaq Eskimos, Yupik display remarkably similar pattern age-related loss. This pattern, indigenous all rapid manifest both preand post-contact skeletons throughout Arctic. Measurements vivo direct photon absorptiometry have been widely accepted clinical studies (Mazess, 1979), but not used assessing population differences (Mazess Christiansen, 1982; Mazess, 1980). Trotter (1956), Baker Newman (1957), Lowrance Latimer Mazess (1966), others demonstrated that weight density long bones varies considerably among These were, by necessity, vitro, consequently limited archaeological or cadaveral series. use non-invasive methods has made it feasible variation (Garn, 1970) populations considerable anthropological interest. However, cortical thickness measurements common assessment do reflect intracortical porosity which significant parameter aging changes osteoporosis (Dickenson et al. 1981). We report here on Yupik-speaking Island. (1971) first noted reduced mass lower skeletal extinct Sadlermiut from Southampton central Canada. Later observations showed living western Canada also had combined 1 Laboratory Biological Anthropology, Department Biobehavioral Sciences, University Connecticut, Storrs, CT 06268. 2Department Medical Physics, School, Madison, 53706. Human Biology, February 1984, Vol. 56, No. 1, pp. 63-77. © Wayne State Press, 1984 downloaded 157.55.39.107 Wed, 30 Mar 2016 05:19:32 UTC All subject http://about.jstor.org/terms 64 А. В. Harper , W. S. Laughlin, R. B. early onset Mather, 1974, 1975). It suggested deficiency apparent high Arctic related protein, phosphate, calcium sea mammal diet. From (Merbs, 1969) patently clear frequency started ages. Northern several hundred years prior contact. nature southern (Yupik-speaking) until recently unknown. Studies based upon skeletonized ancestral-antecedent Aleuts, revealed major cline (Laughlin 1979; Thompson Gunness-Hey, Cortical highest ancestral Umnak-Kodiak homeland Bering Sea Mongoloids decreases along Alaskan coast Circle, approximate demarcation point between Eskimo. values diminish even more extending east across Alaska, Greenland. difference terminal isolates, Aleuts Greenland are as great same isolate. Similarly, femoral measured mirrors highly one hand Frank, 1980; By way brief background evolutionary relationship Mongoloids, we should note these populations, were once resident former Land Bridge. Approximately 9,000 BP diverged, moving into Aleutian Islands occupying Alaska. About 5,000 established permanent colonies Seward Peninsula split speaking least three unsuccessful attempts establish (Harper,