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J Gerontol A Biol Sci Med Sci. 2016 Mar;71(3):356-61. doi: 10.1093/gerona/glv184. Epub 2015 Nov 2.

Dietary Protein Intake Is Protective Against Loss of Grip Strength Among Older Adults in the Framingham Offspring Cohort.

Author information

1
Institute for Aging Research, Hebrew SeniorLife, Boston, Massachusetts. Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts.
2
Institute for Aging Research, Hebrew SeniorLife, Boston, Massachusetts. Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts. ShivaniSahni@hsl.harvard.edu.

Abstract

BACKGROUND:

Age-related decline in muscle strength is an important public health issue for older adults. Dietary protein has been associated with maintenance of muscle mass, yet its relation to muscle strength remains unclear.

METHODS:

We determined the association of dietary protein (total, animal, and plant) intake, measured by food frequency questionnaire, with change in grip strength over 6 years in 1,746 men and women from the Framingham Offspring cohort.

RESULTS:

Mean age at baseline was 58.7 years (range: 29-85), and mean total, animal, and plant protein intakes were 79, 57, and 22 g/d, respectively. Adjusted baseline mean grip strength did not differ across quartiles of energy-adjusted total, animal or protein intake. Greater protein intake, regardless of source, was associated with less decrease in grip strength (all p for trend ≤.05): participants in the lowest quartiles lost 0.17% to 0.27% per year while those in the highest quartiles gained 0.52% to 0.60% per year. In analyses stratified by age, participants aged 60 years or older (n = 646) had similar linear trends on loss of grip strength for total and animal (all p for trend <.03) but not plant protein, while the trends in participants younger than 60 years (n = 896) were not statistically significant.

CONCLUSIONS:

Higher dietary intakes of total and animal protein were protective against loss of grip strength in community-dwelling adults aged 60 years and older. Increasing intake of protein from these sources may help maintain muscle strength and support prevention of mobility impairment in older adults.

KEYWORDS:

Community-based; Diet; Epidemiology; Muscle strength; Nutrition

PMID:
26525088
PMCID:
PMC5864162
DOI:
10.1093/gerona/glv184
[Indexed for MEDLINE]
Free PMC Article

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