Peng LN, Yu PC, Lee HF, Lin MH, Chen LK. Protein-enriched diet improved muscle endurance and marginally reduced intramuscular adiposity: Results from a randomized controlled trial among middle-aged and older adults.
Arch Gerontol Geriatr 2021;
96:104436. [PMID:
34098214 DOI:
10.1016/j.archger.2021.104436]
[Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 05/12/2021] [Accepted: 05/12/2021] [Indexed: 12/30/2022]
Abstract
BACKGROUND
Maintaining sufficient dietary protein intake is important for nutritional status, muscle mass, and healthy aging, but the clinical effects of high protein diet remained controversial..
METHODS
This 12-week randomized controlled trial enrolled community-dwelling middle-aged and older adults to evaluate clinical effects of daily diet with different protein density.. All participants received 10 frozen meals per week for 12 weeks containing either 15% daily calorie of protein (regular-protein group, RPG), or 25% daily calorie of protein (high-protein group, HPG). Bioimpedance analysis was used to assess body composition, and the magnetic resonance imaging on both mid-thighs was performed to measure muscle mass and the intramuscular adiposity.
RESULTS
This trial enrolled 70 participants, and data of 52 participants (mean age: 53.7 ± 8.3 years, 53.8% male; 25 in RPG and 27 in HPG) were available for analysis. Baseline demographic characteristics, functional assessment, body composition and muscle parameters, and laboratory data were similar between groups. During the study period, participants of both groups significantly reduced body weight, body mass index, total body fat percentage, and handgrip strength, but not in the relative appendicular muscle mass). Compared to participants of RPG, HPG participants showed significant improvement in 6-minute walking distance, increased high-sensitivity C-reactive protein and marginal reduction in intramuscular adiposity than RPG participants.
CONCLUSIONS
Higher dietary protein intake significantly improved physical endurance and marginally reduced intramuscular adiposity, but increased the inflammatory biomarker among middle-aged and older adults. Further study is needed to explore long-term effects of high-protein diet among middle-aged and older adults..
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