Acute effects of local vibration on the neuromuscular responses

Authors

  • Leandro Vinhas de Paula Universidade Federal de Ouro Preto
  • Pedro Vieira Sarmet Moreira Instituto Federal Fluminense
  • Leszek Antoni Szmuchrowski Universidade Federal de Minas Gerais

DOI:

https://doi.org/10.14393/BJ-v32n1a2016-32478

Keywords:

Biomechanics, Local vibrations, Maximal Strength, Resistance training, Electromyographical activity.

Abstract

The aim of this study was to evaluate acute neuromuscular responses to local vibrations (LV) exposure through monitoring of imposed acceleration. Nineteen healthy males (age = 22.43 ± 2.76 years; body mass = 76.4 ± 12.94 kg; height = 175 ± 6.76 cm) performed an elbow flexion isometric exercise (Scott bench) in two experimental conditions: simple isometric exercise (Control - CON) and vibrating isometric exercise (Local Vibration - LV; Frequency = 20.01 ± 0.13, displacement = 2 - 5 mm). Protocols consisted of 5 maximal voluntary contractions of 12 seconds each and five minutes of recovery between series with (LV) or without vibration (CON). During the exercise, individuals were seated on the bench with the dominant arm resting on the bench support at an approximate angle of 45º between shoulder flexion and the torso. Strength parameters (Rate of Force Development - RFD, p = .030; Peak Force - PF, p = .027; and Fatigue Index - FI, p = .001) significantly increased in LV compared to CON. For EMG parameters, significant changes were only observed for highest value of increase rate of the EMG signal - RER (p = .041), median frequency of EMG signal between peak force and force at the end of the isometric action - MFFbic (p = .045) (agonist) and root mean square of EMG signal of peak force at the end of the isometric action - RMSFtric (p <.001) (antagonist). The addition of local vibrations in resistance training induced an increase in maximal strength, explosive strength and reduced the capacity to sustain strength generation.

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Published

2016-12-06

How to Cite

DE PAULA, L.V., MOREIRA, P.V.S. and SZMUCHROWSKI, L.A., 2016. Acute effects of local vibration on the neuromuscular responses . Bioscience Journal [online], vol. 32, no. 6, pp. 1729–1737. [Accessed24 May 2022]. DOI 10.14393/BJ-v32n1a2016-32478. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/32478.