Effects of soy protein supplementation versus whey protein in prefrail and frail elderly submitted to a resistance training program

Author(s)

Alan Lins Fernandes

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Escola de Educação Física e Esportes (EEFE/BT)
• Defense date: 2017-10-16

Examining board members

Bruno Gualano; Flavio Henrique Bastos; Adriano Eduardo Lima da Silva

• Advisor: Bruno Gualano

Abstract

Frailty is a geriatric syndrome characterized by progressive biological decline and associated with decreased muscle mass, strength, and functional capacity. Protein consumption in ideal amounts and of high biological value, combined with resistance training, has been shown promising to attenuate age-related damages. Although, the present research aimed to investigate the chronic effects of different sources of protein supplementation (Soy versus whey) combined with resistance training in pre-frail and frail elderly. This thesis is part of a large clinical trial enrolled on the clinicaltrial.gov platform (NCT01890382) entitled Protein Intake and Resistance Training in Aging: \"The Pro Elderly Study\", in a randomized, doubleblind, placebo-controlled and parallel-group design. Experimental design were randomly composed of three groups, placebo (PLA, n = 21), Whey (n = 22) and Soy (n = 22. All analyzes were evaluated in intention to treat procedure throughout Mixed Model (SAS), was used for analysis of repeated measures and, when appropriate, post hoc Tukey for multiple comparisons. The mean total protein intake (1.2 and 1.3 & sup1; in the whey and soy groups, respectively) was not able to induce different responses between protein sources and superiority to placebo in muscle mass, strength and function in pre-frail and frail elderly. All groups increased lean mass (+ 0.4 kg), appendicular mass (+ 0.3 kg), muscle strength gains during 1-RM test in Leg-Press (+ 13 kg) and chest-press (+5,0 kg), increased peak torque (+ 8.5 Nm) and general PTO (+ 60 Nm & sup1;), CSA of rectus femoris (+ 0.04 cm²) and vastus lateralis (+1.3 cm²), timed-stands (+ 1.1 a.u) and improved quality of life for PLA, whey and soy. Therefore, no differences were observed between protein sources in response to ST on muscle mass, strength or function in pre-frail and frail elderly (AU)

• FAPESP's process: 13/21226-7 - Effects of soy protein versus whey protein supplementation in pre-frail and frail elderly submitted to strength training
• Grantee: Alan Lins Fernandes
• Support Opportunities: Scholarships in Brazil - Doctorate