EFFECT OF ACUTE STATIC STRETCH EXERCISES ON ISOKINETIC PEAK TORQUE AT LOAD RANGE AND ISOMETRIC KNEE EXTENSION-FLEXION STRENGTH

Abstract

The purpose of this study was to investigate the effect of acute static stretch on knee isokinetic extension-flexion peak torque at the load range and isometric strength. 14 healthy men (20,4±1,2 year, 70,1±2,7 kg, 176,4±3,6 cm) participated in the study voluntarily. After warming up, subjects were tested for isokinetic concentric (210⁰/ sec, 60⁰ /sec respectively) and isometric knee extensionflexion by isokinetic dynamometer (Cybex NORM Computerized Sports Medicine Inc. USA). After strength measurements, subjects stretched quadriceps and hamstring muscle groups for 3x30 sec, respectively. In the end, strength measurements were repeated using the same procedure. The results are presented ±SEM and the strength values before and after stretch were analysed by paired t test. Peak torque values at 210⁰/sec ve 60⁰/sec during knee extension-flexion at isokinetic load range decreased after stretch exercise (p<0.05). Also, maximal isometric knee extension flexion strength decreased significantly after stretch exercise (p<0.05). Findings suggest that static stretch caused decrease of the isokinetic and isometric muscle strength. This should be taken into consideration when measuring performance and implementing physical therapy exercises

Keywords

• Acute static stretch, isokinetic peak torque, isokinetic load range, isometric strength

Akut statik germe egzersizlerinin izokinetik aralıktaki pik tork ve izometrik diz ekstansiyon-fleksiyon kuvvetine etkisi

Öz

Bu araştırmanın amacı akut statik germe uygulamasının diz ekstansiyon-fleksiyon hareketinde hızın sabit kaldığı izokinetik aralıktaki pik tork ve izometrik pik kuvvete olan etkilerini araştırmaktır. Araştırmaya 14 sağlıklı erkek (20,4±1,2 yaş; 70,1±2,7 kg vücut ağırlığı; 176,4±3,6 cm boy uzunluğu) gönüllü olarak katıldı. Gönüllüler ısınmanın ardından izokinetik dinamometrede (Cybex NORM Computerized Sports Medicine Inc. USA) 210⁰/sn ve 60⁰/sn hızda izokinetik konsantrik diz ekstansiyon- fleksiyon; ve son olarak da izometrik maksimal ekstansiyon- fleksiyon hareketi yaptılar. Kuvvet ölçümlerinden sonra 3x30 sn süre ile quadriceps ve hamstring kas gruplarına statik germe uygulaması yaptırıldı. Germe uygulamasının ardından kuvvet ölçümleri tekrar edildi. Sonuçlar ortalama ± standart hata olarak verildi ve germe öncesi- sonrası kuvvet değerleri paired t testi ile analiz edildi. Germe egzersizi sonrasında 210⁰/sn ve 60⁰/sn hızda izokinetik aralığa ait ekstansiyon ve fleksiyon hareketlerinde pik tork değerlerinde azalma tespit edildi (p<0,05). Maksimal izometrik kasılma kuvveti de hem ekstansiyon hem de fleksiyon hareketinde anlamlı azalma gösterdi (p<0,05). Bulgular akut germe uygulamasının izometrik kasılma sırasındaki pik kuvvetin ve izokinetik aralıktaki pik torkun ekstansiyon ve fleksiyon hareketlerinde baskılandığını göstermiştir. Bu nedenle performans ölçümlerinde ve fizik tedavi uygulamalarında bu husus dikkate alınmalıdır

Anahtar Kelimeler

• Akut statik germe, izokinetik aralık, izokinetik kuvvet, izometrik kuvvet

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