Efeitos do treinamento resistido e da suplementação de Vitamina D na força muscular, composição corporal e estado inflamatório de pessoas idosas

Abstract

This research is a randomized, double-blind clinical trial, which aimed to identify the effects of counter-resistance training (CT) combined with Vitamin D supplementation on variables related to body composition, muscle strength and inflammatory status in elderly people. Over 12 weeks of intervention, 26 individuals (22 women; 70 ± 5 years) were randomly distributed into the experimental (EG) and control (CG) groups, with the EG undergoing CT (2x per week; 2 sets of 8 exercises with load corresponding to 10 maximum repetitions; 2 minutes interval) and daily Vitamin D supplementation (2,000 IU), while the CG was subjected to CT and placebo. The outcomes were: muscle strength of the lower limbs (sitting and getting up from a chair test) and upper limbs (handgrip test); body composition by DEXA (lean mass, appendicular muscle mass, fat mass and fat percentage); markers of inflammatory status (interleukin-6 and tumor necrosis factor alpha). No significant differences were found between the groups for any outcome related to body composition. The training load associated with 10 RM improved significantly in 5 exercises in the GE (GE: plantar flexion = 62.6%; chair extensor = 54.7%; chair flexor = 102.2%; leg-press = 62.2% ; seated row: 61.7% p=0.00), while the CG showed a significant increase in all exercises (plantar flexion = 296.7%; chair extension = 137.1%; chair flex = 97.7%; leg press = 171.3%; bench press = 120.6%; 00, with a significant difference for GE in plantar flexion (62.6% vs 296.7%; p=0.01) and leg press (62.2% vs 171.3%; p=0.01). Only in the CG, improvements were observed for the sitting and getting up from a chair tests (23.4%; p=0.00) and hand grip (7.2%; p =0.05), but without differences between the groups. It is concluded that Vitamin D supplementation, in the dosage used, was not able to enhance the resistance training results in variables related to body composition, muscle strength and inflammatory status of people. elderly