(02-04-14) Protein-enriched diet, with the use of lean red meat, combined with progressive resistance training enhances lean tissue mass....

Protein-enriched diet, with the use of lean red meat, combined with progressive resistance training enhances lean tissue mass.... and muscle strength and reduces circulating IL-6 concentrations in elderly women: a cluster randomized controlled trial.

Daly RM1, O'Connell SL, Mundell NL, Grimes CA, Dunstan DW, Nowson CA.
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Abstract
BACKGROUND:
Physical inactivity, inadequate dietary protein, and low-grade systemic inflammation contribute to age-related muscle loss, impaired function, and disability.
OBJECTIVE:
We assessed the effects of progressive resistance training (PRT) combined with a protein-enriched diet facilitated through lean red meat on lean tissue mass (LTM), muscle size, strength and function, circulating inflammatory markers, blood pressure, and lipids in elderly women.
DESIGN:
In a 4-mo cluster randomized controlled trial, 100 women aged 60-90 y who were residing in 15 retirement villages were allocated to receive PRT with lean red meat (¡­160 g cooked) to be consumed 6 d/wk [resistance training plus lean red meat (RT+Meat) group; n = 53] or control PRT [1 serving pasta or rice/d; control resistance training (CRT) group; n = 47)]. All women undertook PRT 2 times/wk and received 1000 IU vitamin D3/d.
RESULTS:
The mean (¡¾ SD) protein intake was greater in the RT+Meat group than in the CRT group throughout the study (1.3 ¡¾ 0.3 compared with 1.1 ¡¾ 0.3 g ⋅ kg-1 ⋅ d-1, respectively; P < 0.05). The RT+Meat group experienced greater gains in total body LTM (0.45 kg; 95% CI: 0.07, 0.84 kg), leg LTM (0.22 kg; 95% CI: 0.02, 0.42 kg), and muscle strength (18%; 95% CI: 0.03, 0.34) compared with the CRT group (all P < 0.05). The RT+Meat group also experienced a 10% greater increase in serum insulin-like growth factor I (P < 0.05) and a 16% greater reduction in the proinflammatory marker interleukin-6 (IL-6) (P < 0.05) after 4 mo. There were no between-group differences for the change in blood lipids or blood pressure.
CONCLUSION:
A protein-enriched diet equivalent to ¡­1.3 g ⋅ kg-1 ⋅ d-1 achieved through lean red meat is safe and effective for enhancing the effects of PRT on LTM and muscle strength and reducing circulating IL-6 concentrations in elderly women. This trial was registered at the Australian Clinical Trials Registry as ACTRN12609000223235.

Fonte: Am J Clin Nutr. 2014 Jan 29. [Epub ahead of print]

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