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Jambassi Filho, J. C. Effect of strength training and protein supplementation on muscular and functional adaptations in frail elderly: comparison between sexes. 2018. 100 f. Tese (Doutorado em Ciências) – Escola de Educação Física e Esporte, Universidade de São Paulo, São Paulo. 2018. Strength training program associated with protein supplementation has been proposed as a strategy to promote muscular and functional adaptations in frail elderly. However, it is not yet well established whether the magnitude of these adaptations is influenced by sex. Thus, the aim of the presente study was to compare the efficacy of resistance training associated with protein supplementation in the muscular and functional adaptations between frailty men and women. Ninety pre-frail and frail elderly ≥ 65 years old were stratified by sex (♀ and ♂) and randomized to either strength training associated with protein supplementation (PTN) group or placebo (PLA) group. The participants performed 16 weeks of progressive strength training (two sessions per week) associated with two daily doses of 15 g of PTN or PLA supplementation, ingested after breakfast and dinner. The body composition (dual X-ray absorptiometry), muscle cross-sectional area (ultrasound), dynamic muscle strength (one maximal repetition) and isometric (isokinetic dynamometer), electrical muscle activity (electromyography), functional mobility (timed up-and -go), resistance of the lower limbs (timed-stands), postural stability and risk of falls with different instabilities (Biodex Balance System) were assessed preand postintervention. The total muscle mass, arms, legs, appendicular and rectus femoris muscle crosssectional area showed significant increases after intervention in men and women (p > 0.05), with no differences between groups. However, body fat, muscle mass of the trunk, and vastus lateralis muscle cross-sectional area did not show significant changes after 16 weeks of intervention (p > 0.05). All groups presented increases in the values of one maximum repetition in leg-press and supine exercises, peak torque and rate of torque development after the intervention (p < 0.05), with no differences between the sexes. The muscular resistance of the lower limbs, postural stability and risk of falls in high instability showed significantly increases post-intervention (p < 0.05), with no differences between men and women. Post-intervention results showed no significant differences between men and women in quality of life (p > 0.05). No difference was observed between men and women in protein intake (p > 0.05). The findings suggest that the strength training program associated with protein supplementation does not promote distinct responses among pre-frail and frail elderly men and women.

Efeito do treinamento de força e suplementação de proteínas nas adaptações musculares e funcionais em idosos fragilizados: comparação entre sexos