Dietary animal protein intake: association with muscle mass index in older women.
J Nutr Health Aging
; 11(5): 383-7, 2007.
Article
em En
| MEDLINE
| ID: mdl-17657359
ABSTRACT
BACKGROUND:
Aging is associated with reductions in muscle mass and strength, so-called sarcopenia, and is generally characterized using muscle mass index (MMI = FFM (kg)/height (m)2). It is believed that adequate nutrition especially regarding protein intake, can delay this progression and enhance the quality of life of elders.OBJECTIVES:
We examined whether the predominant source of protein consumed (animal or vegetal) by older women was associated with MMI.DESIGN:
Thirty-eight healthy, normal weight, sedentary women, aged between 57-75 years (mean age 66 +/- 5 years old), and taking no medication that could influence metabolism were recruited. Body composition was measured by dual-energy X-ray absorptiometry; muscle protein content was measured by the use of creatinine excretion. Physical activity metabolism was obtained by the use of accelerometry, and indirect calorimetry. Finally, protein intake was measured with a 3-day dietary record.RESULTS:
Significant correlations were observed between MMI and body mass index, fat-free mass, muscle protein content, total protein intake, animal protein intake, fat mass, visceral fat and daily energy expenditure. However, a stepwise regression analysis showed animal protein intake to be the only independent predictor of MMI (r2=0.19; p=0.008).CONCLUSIONS:
Our results suggest that protein intake, especially from animal sources, may be associated with a better preservation of MMI. However, more research is needed to confirm our results.
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Base de dados:
MEDLINE
Assunto principal:
Composição Corporal
/
Proteínas Alimentares
/
Atrofia Muscular
/
Músculo Esquelético
/
Carne
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article