The Effect of Different Limb Occlusion Pressure Ranges on Strength Parameters and Total Repetition in Nordic Hamstring Exercises Performed with Blood Flow Restriction Method

Öz

The aim of this study is to investigate the effect of nordic hamstring exercise (NHE) applied with BFR on successful repetition and hamstring muscle strength (peak torque-average power) at different LOP ranges. 25 male athletes aged 18-22 years were included in the study. Participants were assigned as a single group for cross-sectional at different times. Three-repetition peak torque hamstring measurements were taken athlete using an H-BORD device without BFR. After these measurements, athletes performed NHE exercises at 60%, 70%, and 80% of their LOP pressure at 96 hour intervals using the BFR method with four sets of failure to repetition on an H-BORD device. At each stage, participants' hamstring peak torque, average power values, and the number of successful repetitions were recorded. For the analysis of normally distributed data, a one-factor repeated measures ANOVA test was applied to compare measurements under three different conditions, and the Bonferroni test was preferred among post-hoc tests. Examination of the study findings revealed a decrease in the number of successful repetitions, particularly in relation to increasing LOP pressure (F=164.328, p<0.001, η²=0.873). In terms of strength parameters, except for the non-dominant 60% and 70% comparison (p=0.715, d=0.161), it was determined that as LOP pressure increased, both peak torque (F=26.742, p<0.001, η²=0.527) and average power (F=23.027, p<0.001, η²=0.490) levels resulted in lower levels. Consequently, increasing LOP pressure from 60% to 80% during NHE combined with BFR reduced the number of successful repetitions, and a pressure-dependent decrease in peak torque and average power was observed. Based on these findings, it can be suggested that in high-intensity resistance exercises such as NHE combined with BFR, the LOP ranges recommended in the literature should be varied during planning to limit performance loss and maintain strength output.

Anahtar Kelimeler

• Blood flow restriction
• nordic hamstring
• peak torque
• repetition volume

Kan Akışı Kısıtlama Yöntemi ile Uygulanan Nordic Hamstring Egzersizinde Farklı Uzuv Tıkanma Basınç Aralıklarının Kuvvet Parametreleri ile Tekrar Sayısı Üzerine Etkisi

Öz

Bu çalışmanın amacı, KAK yöntemiyle uygulanan nordic hamstring egzersizinin (NHE) farklı LOP aralıklarında başarılı tekrar sayısı ve hamstring kas kuvveti (pik tork-ortalama güç) üzerine etkisinin incelenmesidir. Çalışmaya 18-22 yaş aralığında 25 erkek sporcu dahil edilmiştir. Katılımcılar tek grup olarak farklı zamanlarda çapraz ölçümlere katılmıştır. H-BORD cihazı ile her sporcunun üç tekrarlı hamstring pik tork ölçümleri KAK yöntemi kullanılmadan alınmıştır. Sporcular bu ölçümlerden sonra 96 saatlik aralıklarla LOP basınçlarının %60’ı %70’i ve %80’i ile NHE egzersizini KAK yöntemiyle dört set tükenmişlik tekrar sayısında H-BORD cihazı ile uygulamıştır.Her aşamada katılımcıların hamstring pik tork ve ortalama güç değerleri ile gerçekleştirilen başarılı tekrar sayıları kayıt altına alınmıştır. Normal dağılım gösteren verilerin analizinde üç farklı koşuldaki ölçümlerin karşılaştırılması için tek faktörlü tekrarlı ölçümler ANOVA testi uygulanmış olup post-hoc testlerden Bonferroni testi tercih edilmiştir. Çalışma bulguları incelendiğinde özellikle artan LOP basıncına bağlı olarak başarılı tekrar sayısında düşüş gözlenmiştir (F=164.328, p<0.001, η²=0.873). Kuvvet parametrelerinde ise non-dominant %60-%70 karşılaştırması hariç (p=0.715, d=0.161), LOP basıncı arttıkça hem pik tork (F=26.742, p<0.001, η²=0.527) hem de ortalama güç (F=23.027, p<0.001, η²=0.490) düzeyinin daha düşük seviyelerde sonuçlandığı belirlenmiştir. Sonuç olarak, KAK ile uygulanan NHE sırasında LOP basıncının %60’tan %80 seviyelere artırılması başarılı tekrar sayısını azaltmış, pik tork ve ortalama güçte basınca bağlı düşüş tespit edilmiştir. Bu bulgular doğrultusunda KAK ile birleştirilen NHE gibi yüksek şiddetli direnç egzersizlerinde performans kaybını sınırlayıp kuvvet çıktısını korumak için literatürde önerilen LOP aralıklarının değişken tutularak planlanması önerilebilir.

Anahtar Kelimeler

• Kan akışı kısıtlama
• nordic hamstring
• pik tork
• tekrar sayısı

Kaynakça

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