Vieira Denis C L, Nascimento Dahan C, Tajra Vitor, Teixeira Tatiane G, Farias Darlan L, Tibana Ramires A, Silva Alessandro O, Rosa Thiago S, DE Moraes Milton R, Voltarelli Fabricio A, Navalta James W, Prestes Jonato
Department of Physical Education, UDF - University Center, Brasília, Distrito Federal, BRAZIL.
College of Physical Education, University of Brasília, Brasília, Distrito Federal, BRAZIL.
Int J Exerc Sci. 2020 May 1;13(3):597-606. doi: 10.70252/WNVF6463. eCollection 2020.
The objective of this study was to compare the effects of very high supervision (VHS-RT) versus high supervision (HS-RT) ratio resistance training (RT) on irisin, brain-derived neurotrophic factor (BNDF), muscle strength, functional capacity, and body composition in elderly women. Participants performed daily undulating periodized RT over 16 weeks with two different supervision ratios: VHS-RT at 1:2 (supervisor/subject) or HS-RT at 1:5. Serum was used to analyze brain derived neurotropic factor (BDNF) and irisin by enzyme-linked immunosorbent assay (ELISA). Body composition was evaluated by dual-energy X-ray absorptiometry, while functional capacity was evaluated using the Six-minute walk test, and Timed Up and Go (TUG). One- repetition maximum (1RM) was determined for bench press and 45° leg press exercises. For both groups, no differences between baseline and post-training were identified for irisin and lean mass ( > 0.05). Both groups improved bench press 1-RM, 45° leg press 1-RM, and TUG ( < 0.05). The VHS-RT group displayed higher effect sizes for 1-RM tests. Moreover, only VHS-RT group reduced body fat and body fat percentage ( < 0.05). In contrast, the HS-RT increased BDNF ( < 0.01). In this sense, RT enhances muscle strength and functional capacity in elderly women independent of supervision ratio. A greater supervision ratio during RT may induce more improvements in muscle strength, and body composition than lower supervision ratio during RT.
本研究的目的是比较极高监督比例（VHS-RT）与高监督比例（HS-RT）的抗阻训练（RT）对老年女性鸢尾素、脑源性神经营养因子（BDNF）、肌肉力量、功能能力和身体成分的影响。参与者在16周内进行每日波动周期化抗阻训练，监督比例分为两种：VHS-RT为1:2（监督者/受试者）或HS-RT为1:5。采用酶联免疫吸附测定（ELISA）法分析血清中的脑源性神经营养因子（BDNF）和鸢尾素。通过双能X线吸收法评估身体成分，同时使用6分钟步行试验和计时起立行走试验（TUG）评估功能能力。测定卧推和45°腿举练习的一次重复最大值（1RM）。两组的鸢尾素和瘦体重在基线和训练后均无差异（>0.05）。两组的卧推1RM、45°腿举1RM和TUG均有改善（<0.05）。VHS-RT组在1RM测试中的效应量更高。此外，只有VHS-RT组的体脂和体脂百分比降低（<0.05）。相比之下，HS-RT组的BDNF升高（<0.01）。从这个意义上说，抗阻训练可增强老年女性的肌肉力量和功能能力，且与监督比例无关。抗阻训练期间较高的监督比例可能比低监督比例在肌肉力量和身体成分方面带来更多改善。
