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2011 | 3 | 35-38
Tytuł artykułu

Electromyographic activity during maximal isometric contraction combined with local sinusoidal vibration

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Study aim: To compare the electromyographic activity during maximal isometric contraction alone or combined with local sinusoidal vibration.Material and methods: A group of 6 men aged 23 - 29 years performed 3 maximal voluntary contractions of the dominant elbow flexors lasting 10 s each and separated by 5-min intermissions. One repetition was without vibration, one was associated with 15-Hz and the other one with 20-Hz vibrations of 5-mm amplitude, the sequence of repetitions being random. A new system to generate local vibration was applied, the parameters of the vibratory stimulus being measured using an accelerometer. Force and EMG activity were also measured. The subjects performed the task in sitting position in a Scott Bench-type device.Results: Mean acceleration RMS significantly (p<0.01) differed between vibration frequencies for the X, Y, Z-axes. No significant differences were found, however, for EMG RMS. Vibration frequencies coincided with the machine-predicted ones; acceleration frequencies around 5 Hz were present in all situations, even without vibration, most likely brought about by tremor.Conclusion: The local vibration applied was not enough to generate different responses in EMG activity. The features of vibratory stimulus confirmed the expected frequency range and revealed frequencies around 5 Hz, that could be attributed to muscle tremor.
Wydawca

Rocznik
Tom
3
Strony
35-38
Opis fizyczny
Daty
wydano
2011-01-01
online
2011-04-13
Twórcy
  • Federal University of Minas Gerais, Belo Horizonte MG, Brazil
  • Federal University of Minas Gerais, Belo Horizonte MG, Brazil
  • Federal University of Minas Gerais, Belo Horizonte MG, Brazil
  • Federal University of Minas Gerais, Belo Horizonte MG, Brazil
  • Federal University of Minas Gerais, Belo Horizonte MG, Brazil
autor
  • Federal University of Minas Gerais, Belo Horizonte MG, Brazil
  • Federal University of Minas Gerais, Belo Horizonte MG, Brazil
Bibliografia
  • Bongiovanni L. G., K. Hagbarth, L. Stjernberg (1990) Prolonged muscle vibration reducing motor output in maximal voluntary contraction in man. J. Physiol. 423:15-26.
  • Bosco C., M. Cardinale, O. Tsarpela (1999) Influence of vibration on mechanical power and electromyogram activity in human arm flexor muscles. Eur. J. Appl. Physiol. 79:306-311.[Crossref]
  • Cardinale M., J. A. Erskine (2008) Vibration training in elite sport: effective training solution or just another fad? Int. J. Sports Physiol. Perform. 3:232-239.[PubMed]
  • Griffin M. J. (1990) Handbook of human vibration. Academic Press, London.
  • Haas C. T., S. Turbanski, K. Kessler, D. Schmidtbleicher (2006) The effects of random whole body vibration on motor symptoms in Parkinson's disease. Neurorehabilitation 21:29-36.
  • Humphries B., G. Warman, J. Purton, T. L. A. Doyle, E. Dugan (2004) The influence of vibration on muscle activation and rate of force development during maximal isometric contractions. J. Sports Sci. Med. 3:16-22.
  • Issurin V. B., D. G. Liebermann, G. Tenenbaum (1994) Effect of vibratory stimulation training on maximal force and flexibility. J. Sports Sci. 12:561-566.[Crossref]
  • Issurin V. B., G. Tenenbaum (1999) Acute and residual effects of vibratory stimulation on explosive strength in elite and amateur athletes. J. Sports Sci. 17:177-182.[Crossref]
  • Jackson, S. W., D. L. Turner (2003) Prolonged muscle vibration reduces maximal voluntary knee extension performance in both the ipsilateral and the contralateral limb in man. Eur. J. Appl. Physiol. 88:380-386.[Crossref]
  • Kelly S. G. (2000) Fundamentals of mechanical vibrations. 2nd ed. McGraw-Hill, United States.
  • Mansfield N. J. (2005) Human response to vibration. CRC Press, New York.
  • Mester J., H. Kleinöder, Z. Yue (2006) Vibrations training: benefits and risks. J. Biomech. 39:1056-1065.[Crossref]
  • Samuelson B., L. Jorfeldt, B. Ahlborg (1989) Influence of vibration on endurance of maximal isometric contraction. Clin. Physiol. 9:21-25.[PubMed][Crossref]
  • Silva H. R., B. P. Couto, L. A. Szmuchrowski (2008) Effects of mechanical vibration applied in the opposite direction of muscle shortening on maximal isometric strength. J. Strength Cond. Res. 22:1031-1036.[WoS][Crossref]
  • Torvinen S., P. Kannus, H. Sievänen, T. A. H. Järvinen, M. Pasanen, S. Kontulainen, T. L. N. Järvinen, M. Järvinen, P. Oja, I. Vuori (2002) Effect of a vibration exposure on muscular performance and body balance. Randomized cross-over study. Clin. Physiol. Funct. Imag. 22:145-152.[Crossref]
  • Torvinen S., H. Sievänen, T. A. H. Järvinen, M. Pasanen, S. Kontulainen, P. Kannus (2002) Effect of 4-min vertical whole body vibration on muscle performance and body balance: a randomized cross-over study. Int. J. Sports Med. 23:374-379.[PubMed][Crossref]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_v10101-011-0008-3
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