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The influence of red meat intake upon the response to a resistance exercise-training program in older Australians.
MedLine Citation:
PMID:  15023610     Owner:  NLM     Status:  In-Data-Review    
Background - In older adults muscle performance declines with age, and in the elderly this can have a major impact on daily living by impairing the ability to undertake routine activities, increasing risk of falls and hindering recovery from injury. A recent study has suggested that the protein intake of older adults may be insufficient to maintain optimum muscle capacity. Objective - To examine the effects of a 12-week diet and exercise program upon skeletal muscle performance and body composition in older Australians. Design - Subjects (n =28, mean age =67yr, range 63-76yr) undertook a lower limb resistance-training program while consuming a diet with 20% energy as protein delivered through two levels of red meat intake (either moderate =800g/week, or low =400g/week in combination with other sources of dietary protein). Muscle performance was assessed at weeks 0,6 and 12. At week 0 and week 12, body composition was assessed using anthropometry, BIA and thigh X-sectional CT, and dietary intake assessed by diet history. Outcomes - Exercise training significantly increased leg muscle strength by more than 50% (P<0.01) and muscle endurance about 30% (P<0.01), and reduced thigh skin folds about 15% (P<0.01). Subjects on the moderate red meat diet had greater improvements in muscle strength at week 6 than those on the low red meat diet (P<0.01), but this difference was abolished at the study endpoint. The red meat was incorporated into both diets with no change in overall energy intake. Conclusions - In older Australians, a resistance-training program markedly increased muscle strength. Consuming a diet with a moderate red meat content compared to a low red meat content in part enhanced the benefits upon muscle performance.
P L McLennan; L C Tapsell; A J Owen; I F Gutteridge
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Asia Pacific journal of clinical nutrition     Volume:  12 Suppl     ISSN:  0964-7058     ISO Abbreviation:  Asia Pac J Clin Nutr     Publication Date:  2003  
Date Detail:
Created Date:  2004-03-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9440304     Medline TA:  Asia Pac J Clin Nutr     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  S17     Citation Subset:  IM    
Smart Foods Centre,University of Wollongong, NSW 2522.
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