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Effect of aging on torque steadiness of trunk flexor and extensor muscles

Grant number: 17/06567-3
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2017
Effective date (End): August 31, 2018
Field of knowledge:Health Sciences - Physiotherapy and Occupational Therapy
Principal Investigator:Daniela Cristina Carvalho de Abreu
Grantee:Sállua Berlanga Spilla
Home Institution: Faculdade de Medicina de Ribeirão Preto (FMRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil

Abstract

Torque steadiness (TS) corresponds to an individual's ability to maintain a constant submaximal isometric contraction at a given strength level, is considered an important component that maintains balance and functional performance. It is known that the elderly present a loss in TS when compared to the young. However, there are few studies that refer to the extensor and flexor muscles of the trunk, and to the influence of the TS of these muscles on postural control. Thus, the objective of this study will be to compare TS of the extensor and flexor muscles of the trunk between young and old with and without a history of falls, which may generate important information for understanding the influence of this muscle group on postural control. To this end, independent community members aged over 60. There will be measurement of the TS of the extensor and flexor muscles of the trunk. Participants will perform the evaluations in two days, with a predetermined interval of two to seven days between them. On the first day, the anthropometric data will be collected for characterization of the sample, and the evaluation of the history of falls will be performed through a semi-structured questionnaire. On the first day, the individual will be familiarized with the isokinetic dynamometer (Biodex, System 4 Pro, Nova York, USA) for the evaluation of the trunk muscles. Already on the second day of data collection, the isokinetic dynamometer test will be performed to obtain torque control of trunk extensors and flexors, with the equipment synchronized to the electromyography module (EMG System, Brazil) obtaining a sampling frequency of 2000 Hz, to record the CT data that will be considered in the research. All statistical analyzes will be performed using the program GraphPadPrism version 5.0 for Windows (GraphPad Software, San Diego, California, USA) and will be adopted level of significance of 5% (p £ 0,05). The results will be expressed as mean and standard deviation of the mean. (AU)