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Open AccessArticle

Moderate Increase in Protein Intake Promotes a Small Additional Improvement in Functional Capacity, But Not in Muscle Strength and Lean Mass Quality, in Postmenopausal Women Following Resistance Exercise: A Randomized Clinical Trial

1
School of Medicine, Federal University of Uberlandia (UFU), Av. Pará, nº 1720, Bloco 2U, Campus Umuarama, Uberlandia 38400-902, Minas Gerais, Brazil
2
Exercise Biology Research Group (BioEx), Federal University of Triangulo Mineiro (UFTM), Uberaba 38061-500, Minas Gerais, Brazil
3
Department of Sport Sciences, Federal University of Triangulo Mineiro (UFTM), Uberaba 38061-500, Minas Gerais, Brazil
*
Author to whom correspondence should be addressed.
Nutrients 2019, 11(6), 1323; https://doi.org/10.3390/nu11061323
Received: 2 April 2019 / Revised: 4 June 2019 / Accepted: 5 June 2019 / Published: 13 June 2019
(This article belongs to the Special Issue Nutrients Intake, Exercise and Healthy Ageing)
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Abstract

The aim of this study was to evaluate the effect of a moderate increase in protein intake on muscle strength, functional capacity and lean mass quality improvements in postmenopausal women following resistance exercise. Forty-seven postmenopausal women were randomized in two groups: Normal protein (NP, n = 25), who received a dietary plan containing ~0.8 g protein·kg−1·d−1 (recommended dietary allowance—RDA recommendations); and higher protein (HP, n = 22), which a moderate increase in protein intake was recommended (~1.2 g protein·kg−1·d−1). Resistance training was performed for 10 weeks, three times/week. Muscle strength (handgrip strength and one repetition maximum test—1-RM), functional capacity and lean mass (LM) quality (muscle strength to lean mass ratio) were evaluated. Dietary intake was assessed by nine 24 h food recalls. After intervention, both groups increased similarly the leg extension 1-RM and handgrip strength. Regarding functional capacity tests, both groups increased the balance test score (SPPB) and 10 m walk test speed, with no differences between the groups. In addition, an increase in speed to perform the 6 min and 400 m walk tests was observed over the time, with an additional improvement in the HP group (time × group interaction; p = 0.007 and p = 0.004, respectively). About LM quality, leg extension 1-RM/leg LM improved over the time in both groups (p = 0.050), with no time × group interaction. All these significant changes had a low effect size. In conclusion, a moderate increase in protein intake promoted a small additional improvement in functional capacity, but it did not induce a greater increase in strength and LM quality after 10 weeks of resistance exercise in postmenopausal women. This trial was registered at ClinicalTrials.gov as NCT03024125. View Full-Text
Keywords: muscle strength; dietary intervention; muscle function; muscle mass quality muscle strength; dietary intervention; muscle function; muscle mass quality
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Nahas, P.C.; Rossato, L.T.; Martins, F.M.; Souza, A.P.; de Branco, F.M.S.; Carneiro, M.A.S.; Teixeira, K.R.C.; Orsatti, F.L.; de Oliveira, E.P. Moderate Increase in Protein Intake Promotes a Small Additional Improvement in Functional Capacity, But Not in Muscle Strength and Lean Mass Quality, in Postmenopausal Women Following Resistance Exercise: A Randomized Clinical Trial. Nutrients 2019, 11, 1323.

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