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Reactive Response of Older Tennis Practitioners and Healthy Young People in Relation to Balance Perturbations

Journal of Science in Sport and Exercise 2022年第1期4卷 82-90页

作者： Nathana Alves de França Lucca Zambuzzi Nardin do Nascimento Caluê Papcke eduardo Mendonça scheeren Graduate Program on Health in Technology Pontifical Catholic University of ParanáSt.Imaculada Conceição1155Prado VelhoCuritibaParaná80215-901Brazil Physical Education Pontifical Catholic University of ParanáSt.Imaculada Conceição1155Prado VelhoCuritibaParaná80215-901Brazil

Background Improving balance control in older adults is one of the main objectives of fall prevention programs,and tennis could represent a promising way to train balance *** To verify whether older tennis players have similar reactive response characteristics to balance perturbations to those of healthy young *** Fifteen young people(23.00±1.96 years)and twelve older people(69.08±3.82 years),remained in an orthostatic position,with their arms at their sides,on a force platform during ten mediolateral *** surface electromyo-graphy signal of the gluteus maximus,tibialis anterior,gastrocnemius lateralis,and vastus lateralis muscles was acquired on the dominant *** The velocity and amplitude parameters of the center of pressure displacement were similar between the groups,as well as the amplitude of the electromyography signal of the tibialis anterior,vastus lateralis,and gastrocnemius lateralis *** was a statistical difference between the groups in the gluteus maximus muscle in the first *** Older tennis players present similar center of pressure velocity performance and amplitude of center of pres-sure displacement behavior to young *** tennis players have an increased range of muscle activation,generating automatic postural responses adapted to deal with situations of balance perturbations.

关键词： Adaptation Fall Postural control Seniors Tennis

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The Influence of Window Length Analysis on the Time and Frequency Domain of Mechanomyographic and Electromyographic Signals of Submaximal Fatiguing Contractions

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Open Journal of Biophysics 2013年第3期3卷 178-190页

作者： Guilherme Nogueira-Neto eduardo scheeren Eddy Krueger Percy Nohama Vera Lucia S.N.Button Departamento de Engenharia Biomedica/CEB Universidade Estadual de Campinas-UNICAMPCampinasBrazil Laboratorio de Engenharia de Reabilitacao Pontificia Universidade Catolica do Parana-PUCPRCuritibaBrazil CPGEI Universidade Tecnologica Federal do Parana-UTFPRCuritibaBrazil

Mechanomyography (MMG) acquires the oscillatory waves of contracting muscles. Electromyography (EMG) is a tool for monitoring muscle overall electrical activity. During muscle contractions, both techniques can investigate the changes that occur in the muscle properties. EMG and MMG parameters have been used for detecting muscle fatigue with diverse test protocols, sensors and filtering. Depending on the analysis window length (WLA), monitoring physiological events could be compromised due to imprecision in the determination of parameters. Therefore, this study investigated the influence of WLA variation on different MMG and EMG parameters during submaximal isometric contractions monitoring MMG and EMG parameters. Ten male volunteers performed isometric contractions of elbow joint. Triaxial accelerometer-based MMG sensor and EMG electrodes were positioned on the biceps brachii muscle belly. Torque was monitored with a load cell. Volunteers remained seated with hip and elbow joint at angles of 110° and 90°, respectively. The protocol consisted in maintaining torque at 70% of maximum voluntary contraction as long as they could. Parameter data of EMG and the modulus of MMG were determined for four segments of the signal. Statistical analysis consisted of analyses of variance and Fisher’s least square differences post-hoc test. Also, Pearson’s correlation was calculated to determine whether parameters that monitor similar physiological events would have strong correlation. The modulus of MMG mean power frequency (MPF) and the number of crossings in the baseline could detect changes between fresh and fatigued muscle with 1.0 s WLA. MPF and the skewness of the spectrum (μ3), parameters related to the compression of the spectrum, behaved differently when monitored with a triaxial MMG sensor. The EMG results show that for the 1.0 s and 2.0 s WLAs have normalized RMS difference with fatigued muscle and that there was strong correlation between parameters of different domains.

关键词： Mechanomyography Electromyography Window Length Analysis Local Muscle Fatigue

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