DOES EMG ACTIVATION DIFFER AMONG FATIGUE-RESISTANT LEG MUSCLES DURING DYNAMIC WHOLE-BODY VIBRATION?

ŞİMŞEK D.

SOUTH AFRICAN JOURNAL FOR RESEARCH IN SPORT PHYSICAL EDUCATION AND RECREATION, cilt.38, sa.1, ss.149-165, 2016 (SSCI) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 38 Sayı: 1
  • Basım Tarihi: 2016
  • Dergi Adı: SOUTH AFRICAN JOURNAL FOR RESEARCH IN SPORT PHYSICAL EDUCATION AND RECREATION
  • Derginin Tarandığı İndeksler: Social Sciences Citation Index (SSCI), Scopus
  • Sayfa Sayıları: ss.149-165
  • Anahtar Kelimeler: Fatigue, Fatigue resistance, Isokinetic, Rehabilitation, Muscle activation, Electromyography, MECHANICAL POWER, VASTUS LATERALIS, JUMP HEIGHT, OLDER WOMEN, STRENGTH, EXERCISE, FREQUENCY, PERFORMANCE, RESPONSES, AMPLITUDE
  • Anadolu Üniversitesi Adresli: Evet

Özet

The purpose of this study was to determine the effects of dynamic whole-body vibration (WBV) stimuli on the electromyographic (EMG) responses of different fatigue-resistant leg muscles. The participants (N=32) were divided into two groups according to the Fatigue Index value [Group I: Less Fatigue Resistant (LFR), n=17; Group II: More Fatigue Resistant (MFR), n=15]. The repeated EMG activities of four leg muscles [rectus femoris, biceps femoris, vastus lateralis and vastus medians] were analysed during WBV stimulation. The data were analysed using PASW/SPSS Statistics 18.0 and the significance level was set at p<0.05. The results revealed that the vibration frequency, amplitude and group (MFR and LFR) had a significant effect (p<0.001) on the EMG response. Dynamic WBV stimuli performed at different frequencies (30Hz, 35Hz and 40Hz) and amplitudes (2mm and 4mm) resulted in significantly increased lower-body muscular activation. However, the LFR group exhibited a significantly higher percentage increase in EMG activation at higher frequencies (max 40Hz) and amplitudes (4mm) (p <= 0.001). The results could be useful for the optimal prescription of vibration exercise and can guide the development of training and rehabilitation programmes.