THE EFFECT OF SHORT-TERM VIBRATION ON SOMATOSENSORY TEMPORAL DISCRIMINATION THRESHOLD

Abstract

Objective: This study will evaluate the changes in the somatosensory temporal discrimination threshold (STDT) after focal muscle vibration. The hypothesis was that the STDT, which is related to the functions of basal ganglia and somatosensory cortex, would deteriorate during application of peripheral muscle vibration if it had indirect central effects. Materials and Methods: A total of fifteen healthy subjects (mean age 24.3±5.6;18-60) years) were prospectively included in the study. The researchers performed recordings of sensory threshold and the STDT on the second finger before, during, and after vibration in all subjects. A 100 Hz vibration was applied on the forearm flexor muscles for two minutes. The recordings were repeated four times: during, immediately after, one minute after, and three minutes after vibration. Results: The mean STDT was 95.0±30.0 ms in recordings before vibration. During vibration, the STDT was significantly longer (146.9±52.6 ms) as compared to previbration recordings. However, the STDT value reduced immediately after the vibration and returned to previbration levels at one minute recordings (p=0.001, Friedman test). Conclusion: The STDT value was longer during vibration. The longer STDT values during vibration suggest that the central effects of vibration can occur either directly or indirectly.

Keywords

• Somatosensory temporal discrimination threshold
• vibration
• central effects

KISA SÜRELİ VİBRASYON UYGULAMASININ SOMATOSENSORİYEL TEMPORAL DİSKRİMİNASYON EŞİĞİ ÜZERİNE ETKİSİ

Abstract

Amaç: Çalışmamızın amacı, fokal kas vibrasyonu sonrası somatosensoriyel temporal diskriminasyon eşiğindeki (STDT) değişiklikleri değerlendirmektir. Hipotezimiz, vibrasyonun dolaylı santral etkileri olması durumunda bazal ganglionlar ve somatosensoriyel korteks fonksiyonları ile ilgili olan STDT’nin, periferik kas vibrasyonu uygulaması sırasında STDT’de değişiklikler oluşabileceğiydi. Gereç ve Yöntem: Çalışmaya prospektif olarak toplam on beş sağlıklı birey (ortalama yaş 24,3±5,6 years; 18-60 years) dahil edildi. Tüm deneklerde vibrasyon öncesinde, sırasında ve hemen sonrasında işaret parmağında önce duyusal eşik ve sonrasında STDT ölçümleri gerçekleştirildi. Önkol fleksör kaslarına 100 Hz’den iki dakika süreyle vibrasyon uygulandı. Kayıtlar, vibrasyon sırasında, hemen sonrasında, bir dakika sonra ve üç dakika sonra olmak üzere dört kez tekrarlandı. Bulgular: Ortalama STDT değeri vibrasyon uygulanmadan önce 95,0±30,0 ms idi. Vibrasyon sırasında, STDT önceki kayıtlara kıyasla anlamlı olarak daha uzun olarak bulundu (146,9±52,6 ms). Ancak, vibrasyondan hemen sonra STDT değeri önemli ölçüde azaldı ve bir dakikalık kayıtta vibrasyon uygulanmadan önceki seviyelerine düştüğü gözlemlendi (p=0,001, Friedman testi). Sonuç: Çalışmamızda, STDT değeri vibrasyon sırasında daha uzun olarak bulunmuştur. Daha uzun süre olan STDT değeri, vibrasyon etkisi altında, doğrudan veya dolaylı olarak titreşim duyusunun merkezi etkisi olabileceği düşünülmüştür.

Keywords

• Somatosensoriyel temporal diskriminasyon eşiği
• vibrasyon
• merkezi etkileri

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