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J Nutr Health Aging. 2007 Sep-Oct;11(5):383-7.

Dietary animal protein intake: association with muscle mass index in older women.

Author information

1
Research Centre on Aging, Geriatric Institute of Sherbrooke University, Faculty of Physical Education and Sports, Québec, Canada.

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.

PMID:
17657359
[Indexed for MEDLINE]

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