TÜM VÜCUT VİBRASYONUN KAS AKTİVASYONLARINA ETKİSİ: HANGİSİ EN ETKİLİ, DÜŞÜK FREKANS MI YÜKSEK FREKANS MI?

Öz

Amaç: Tüm Vücut Vibrasyon (TVV), kişiye bir destek yüzeyinden pasif olarak mekanik salınımlar uygular. Tonik vibrasyon refleksi yanıtı, vibrasyon lokalizasyonuna, frekansına, amplitüdüne ve kasın başlangıç uzunluğuna bağlıdır, ancak optimal frekansın ne olması gerektiği konusunda bir fikir birliği yoktur. Bu çalışma, TVV'de yapılan squat egzersizi sırasında alt ekstremite kaslarının düşük ve yüksek frekanslardaki aktivasyon farklılıklarını incelemek amacıyla yapılmıştır. Yöntem: Bu çalışmaya 16 sağlıklı birey dahil edildi (Yaş = 23,66 ± 2,33 yıl, Vücut Kitle İndeksi = 22,59 ± 3,86 kg/m2). TVV uygulaması, vertikal vibrasyon platformunda (GLOBUS Physioplate®) gerçekleştirildi. Katılımcılar düşük amplitüdte (2-3 mm) 20 Hz ve 60 Hz’lik vibrasyon durumlarında TVV üzerinde 20 saniye boyunca statik half-squat yaptılar. Gluteus Medius (GMed), Gluteus Maximus (GMax), Vastus Lateralis (VL) ve Vastus Medialis (VM) kaslarının aktivasyonunu ölçmek için 8 kanallı Elektromiyografi (EMG) Noraxon MiniDTS sistemi kullanıldı. Sonuçlar: VM, VL, GMed kaslarının aktivasyonu için iki frekans arasında fark olduğu gözlendi (sırasıyla p = 0,004; 0,001; 0,002). Çalışmamız, yüksek frekanstaki GMed, VL ve VM kas aktivitelerinin titreşim frekanslarının düşük frekansa göre arttığını göstermektedir. Gmax kas aktivitesinde iki frekans arasında istatistiksel olarak anlamlı bir fark bulunmadı (p=0,013). Tartışma: Fizyoterapistler ve antrenörler TVV uygulamalarında, özellikle quadriceps ve gluteus medius kaslarında nöromusküler yanıtı geliştirmeye ihtiyaç duyduklarında yüksek frekansları tercih etmelidirler.

Anahtar Kelimeler

• Elektromyografi
• Frekans
• Tüm Vücut Vibrasyon
• alt ekstiremite

WHOLE-BODY VIBRATION EFFECT ON MUSCLE ACTIVATIONS: WHICH ONE IS THE MOST EFFECTIVE, LOW FREQUENCY OR HIGH FREQUENCY?

Abstract

Purpose: Whole Body Vibration (WBV) is a practice that passively applies mechanical oscillations to an individual from a support surface. The tonic vibration reflex response depends on the vibration localization, frequency, amplitude, and initial length of the muscle, but there is no consensus on what the optimal frequency should be. This study was conducted to examine the activation differences of lower extremity muscles at low and high frequencies during squat exercise on WBV. Methods: This study involved 16 healthy individuals (Age = 23.66 ± 2.33 years, Body Mass Index= 22.59 ± 3.86 kg/m2). WBV application was performed on a vertical vibration platform (GLOBUS Physioplate®). Participants performed static half-squats on WBV for 20 seconds under vibrating (20 Hz and 60 Hz; 2-3 mm amplitude) conditions. An 8-channel Electromyography (EMG) Noraxon MiniDTS system was used to measure the activation of the Gluteus Medius (GMed), Gluteus Maximus (GMax), Vastus Lateralis (VL), and Vastus Medialis (VM) muscles. Results: It was observed that there was a difference between the two frequencies for the activation of the VM, VL, and GMed muscles (p = 0.004, 0.001, 0.002, respectively). Vibration frequencies of GMed, VL, and VM muscle activities at high frequency were increased compared to low frequency. GMax did not show any statistically significant change between the two vibration conditions (p=0.013). Conclusions: Physiotherapists and trainers should prefer high frequencies in WBV applications, especially when they need to improve the neuromuscular response in the quadriceps and gluteus medius muscles.

Keywords

• Electromyography
• Whole-Body Vibration
• Frequency
• lower extremity

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