ABDOMINAL BRACING MANEVRASININ FARKLI DİZ FLEKSİYON AÇILARINDA, KUADRİSEPS ZİRVE TORKU, ZİRVE TORKA ULAŞMA SÜRESİ VE KAS AKTİVASYONU ÜZERİNE ETKİSİ

Öz

Amaç: Bu çalışmanın amacı sağlıklı bireylerde abdominal bracing manevrasının (ABM) maksimal kuvvet testi sırasında kuadriseps zirve torku (ZT), zirve torka ulaşma süresi ve kas aktivasyonuna etkisini araştırmaktı. Yöntem: Bu çalışmaya 16 sağlıklı birey (Yaş: 24,63±1,67 yıl) katılım gösterdi. Her bireye fizyoterapist tarafından ABM tekniği öğretildi. Internal oblik/transversus abdominis, vastus medialis, vastus lateralis ve rektus femoris kaslarının aktivasyonu ölçümünde yüzeysel elektromyografi kullanıldı. Maksimal izometrik test sırasında kuadriseps ZT ve zirve torka ulaşma süresi değerleri 60° ve 90° diz fleksiyon açılarında izokinetik dinamometre ile ölçüldü. İstatistiksel analizde tekrarlı ölçümler ANOVA kullanıldı. Sonuçlar: Kuadriseps ZT değerinde, duruma göre açı etkileşimi anlamlı bulundu (F(1,15)=5,30, p=0,04). ZT değerleri her iki diz açısında da ABM ile düştü ancak düşüş 60° diz fleksiyon açısında 90°’ye göre daha fazla idi (60°: p=0,001; ES=0,68; 90°: p=0,008, ES=0,33). Kuadriseps kas aktivasyonunda da ABM ile düşüş olduğu görüldü (p=0,04). Tartışma: Yapılan çalışma sonuçları maksimal kuadriseps kas testi sırasında hem ZT hem kas aktivasyon seviyelerinin düştüğünü göstermektedir. Araştırmacılar test sonuçlarında kuvvet aktarımının sebep olacağı yanılmayı engellemek için lumbopelvik bölgenin kompansatuar hareketlerini değerlendirmelidir.

Anahtar Kelimeler

• Elektromyografi
• Diz Eklemi
• Maksimal kuvvet

THE EFFECTS OF ABDOMINAL BRACING MANEUVER ON QUADRICEPS MUSCLE TORQUE, TIME TO PEAK TORQUE AND MUSCLE ACTIVATION LEVELS AT DIFFERENT KNEE FLEXION ANGLES

Abstract

Purpose: The aim of the present study was to investigate the effects of abdominal bracing maneuver (ABM) on quadriceps peak torque (PT), time to peak torque (TTPT) and muscle activation levels during maximal strength testing of the quadriceps muscle in healthy individuals. Methods: Sixteen healthy individuals (Age: 24.63±1.67 years) participated in the present study. Each participant was taught ABM technique by a physical therapist’s guidance. Surface electromyography was used to measure internal oblique/transversus abdominis, vastus medialis, vastus lateralis, and rectus femoris activation levels. Isokinetic dynamometry was used to measure quadriceps PT and TTPT during maximum isometric muscle testing at 60° and 90° of knee flexion angles with and without ABM. Repeated measures of ANOVA was performed for statistical analysis. Results: There was a significant angle by condition interaction for quadriceps PT (F(1,15)=5.30, p=0.04). PT decreased when ABM was performed, but the decrease was greater at 600 compared to 900 of knee flexion (60°: p=0.001, ES=0.68; 90°: p=0.008, ES=0.33). Quadriceps activation levels also decreased during ABM (p=0.04) regardless of knee flexion angle. Conclusion: The present study revealed that ABM may decrease muscle activation levels and peak torque during maximal quadriceps strength testing. Researchers should evaluate compensatory movements of the lumbopelvic region in order to prevent the error of force transfer in test results.

Keywords

• Electromyography
• Knee joint
• Maximal Strenght

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