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Effects of birth cohort and age on body composition in a sample of community-based elderly
Oleh:
Ding, Jingzhong
;
Kritchevsky, Stephen B.
;
Newman, Anne B.
;
Taaffe, Dennis R.
;
Nicklas, Barbara J.
;
Visser, Marjolein
;
Tylavsky, Frances A.
;
Rubin, Susan M.
;
Pahor, Marco
;
Harris, Tamara B.
Jenis:
Article from Journal - ilmiah internasional
Dalam koleksi:
The American Journal of Clinical Nutrition vol. 85 no. 02 (Feb. 2007)
,
page 405.
Ketersediaan
Perpustakaan FK
Nomor Panggil:
A07.K.2007.01
Non-tandon:
1 (dapat dipinjam: 0)
Tandon:
tidak ada
Lihat Detail Induk
Isi artikel
Background: The effect of the recent obesity epidemic on body composition remains unknown. Furthermore, age-related changes in body composition are still unclear. Objective: The objective was to simultaneously examine the effects of birth cohort and age on body composition. Design: A total of 1786 well-functioning, community-based whites and blacks (52% women and 35% blacks) aged 70–79 y from the Health, Aging, and Body Composition Study underwent dual-energy X-ray absorptiometry annually from 1997 to 2003. Results: At baseline, mean ± SD percentage body fat, fat mass, and lean mass (bone-free) were 28 ± 5%, 24 ± 7 kg, and 56 ± 7 kg, respectively, for men and 39 ± 6%, 28 ± 9 kg, and 40 ± 6 kg for women. Mixed models were used to assess the effects of cohort and age-related changes on body composition. Later cohorts in men had a greater percentage body fat (0.32% per birth year, P < 0.0001) than did earlier cohorts. This cohort effect was due to a greater increase in fat mass than in lean mass (0.45 kg and 0.17 kg/birth year, respectively). With increasing age, percentage body fat in men initially increased and then leveled off. This age-related change was due to an accelerated decrease in lean mass and an initial increase and a later decrease in fat mass. Similar but less extreme effects of cohort and age were observed in women. Conclusions: The combination of effects of both birth cohort and age leads to bigger body size and less lean mass in the elderly.
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