Biomaterial Database

Seasonal variation of lumbar spine bone mineral content in normal women. 1983

B Krølner

The seasonal influence on lumbar spine bone mineral was evaluated in a prospective study of 26 normal women aged 19-66 years. Bone mineral content of the second, third, and fourth lumbar vertebrae (lumbar BMC) was determined every 3 months during 1 year by using dual-photon (153Gd) absorptiometry. Lumbar BMC was, on an average (mean +/- SE), 0.86 +/- 0.27 arbitrary units or 1.7 +/- 0.5% higher in July to September than in January to March (P less than 0.005), when other sources of variation were eliminated. It is hypothesized that the seasonal variation in lumbar spine bone mineral reflects differences of the mechanical loading on the vertebrae. The interpretation of longitudinal studies of lumbar BMC may be erroneous if the seasonal variations in bone mineral are not considered.

UI	MeSH Term	Description	Entries
D008159	Lumbar Vertebrae	VERTEBRAE in the region of the lower BACK below the THORACIC VERTEBRAE and above the SACRAL VERTEBRAE.	Vertebrae, Lumbar
D008593	Menopause	The last menstrual period. Permanent cessation of menses (MENSTRUATION) is usually defined after 6 to 12 months of AMENORRHEA in a woman over 45 years of age. In the United States, menopause generally occurs in women between 48 and 55 years of age.	Change of Life, Female
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D008903	Minerals	Native, inorganic or fossilized organic substances having a definite chemical composition and formed by inorganic reactions. They may occur as individual crystals or may be disseminated in some other mineral or rock. (Grant & Hackh's Chemical Dictionary, 5th ed; McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	Mineral
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328	Adult	A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.	Adults
D000368	Aged	A person 65 years of age or older. For a person older than 79 years, AGED, 80 AND OVER is available.	Elderly
D012621	Seasons	Divisions of the year according to some regularly recurrent phenomena usually astronomical or climatic. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Seasonal Variation,Season,Seasonal Variations,Variation, Seasonal,Variations, Seasonal