The Effect of Active Static Stretching and Different Rest Intervals on Isokinetic Leg Strength

Abstract

The aim of the study is to investigate the acute effect of active static stretching on isokinetic leg strength and change of this effect depending on resting after stretching in athletes. 23 male and 38 female athletes from various branches (22-football, 19-volleyball, 16-basketball and 4-athletics) participated in the volunteer work at Gazi University Faculty of Sports Sciences between ages 19-23. Four separate active static stretching exercises for hamstring, quadriceps, and other muscles of right knee for sixty seconds each were identified. Participants were administered four different protocols involving the these exercises [(a) warming, (b) warming+static stretching, (c) warming+static stretching + five minutes rest, (d) warming + static stretching+fifteen minutes rest) then hamstring and quadriceps isokinetic strength and hamstring/quadriceps isokinetic strength ratio H/Q (R) values were recorded at 60^o /sec angular velocity using the Isomed after each protocol. Statistically significant results were obtained between the a-b and b-d measurements as a result of the analyzes. In both male and female and total (T) analyzes; compared with (a), (b) measurement values were significantly lower (T; hamstring;a-b=+17.8 Nm, quadriceps;a-b = +19.6 Nm) and (d) measurement values were significantly higher when compared to (b) (T; hamstring;b-d=-13.7 Nm, quadriceps;b-d=-14.3 Nm).There were no significant differences between other measurements and power ratios (H/Q)  (p<0.05). It is suggested that the acute static stretching has a negative effect on the isokinetic strength of the muscle by findings, so it is advisable to terminate the static stretching at least fifteen minutes before the competition or to avoid activities requiring maximum contraction immediately after active static stretching. On the other hand, different stretching times, different angular velocities and the need for new work to be done with different muscle groups should not be overlooked.

Keywords

• Rest interval,stretching,isokinetic

Aktif Statik Germe ve Farklı Dinlenme Aralıklarının İzokinetik Bacak Kuvveti Üzerine Etkisi

Öz

Sporcularda aktif statik germenin izokinetik bacak kuvveti üzerine akut etkisini ve bu etkinin germe sonrası dinlenmeye bağlı olarak değişimini araştırmaktır. Gazi Üniversitesi Spor Bilimleri Fakültesinden 19-23 yaş aralığında çeşitli branşlarda (22-futbol, 19-voleybol, 16-basketbol ve 4- atletizm) 23 erkek ve 38 kadın sporcu gönüllü olarak çalışmaya dahil edildi. Sağ taraf hamstring, kuadriseps ve dizin diğer kaslarına yönelik her biri altmış saniye süreli dört ayrı aktif statik germe egzersizi belirlendi.. Katılımcılara bu egzersizleri içeren dört farklı protokol [(a) ısınma, (b) ısınma + statik germe, (c) ısınma + statik germe + beş dakika dinlenme, (d) ısınma + statik germe + on beş dakika dinlenme] uygulandı ve her protokolden sonra İsomed 2000 izokinetik cihazı kullanılarak 60^o/s açısal hızda hamstring ve kuadriseps izokinetik kuvveti ile hamstring/kuadriseps izokinetik kuvvet oranı H/K (R) değerleri kaydedildi. Analizler sonucunda a-b ve b-d ölçümleri arasında istatistiksel olarak anlamlı sonuçlar tespit edildi. Hem kadın hem erkek hem de toplam (T) analizlerde; (a) ya nazaran (b) ölçüm değerleri anlamlı olarak düşük (T; hamstring;a-b=+17.8 Nm, kuadriseps;a-b=+19.6 Nm) ve (b) ye nazaran (d) ölçüm değerleri anlamlı olarak yüksek bulunmuştur (T; hamstring; b-d=-13.7 Nm, kuadriseps; b-d=-14.3 Nm). Diğer ölçümler arasında ve kuvvet oranlarında (H/K) anlamlı bir değişiklik bulunmadı (p<0,05). Bulgular ışığında akut statik germenin kasın izokinetik kuvveti üzerinde negatif bir etki yarattığı, bu nedenle müsabakalardan en az on beş dakika öncesinde statik germenin sonlandırılması veya aktif statik germenin hemen sonrasında maksimum kontraksiyon gerektirecek aktivitelerden uzak durulması önerilebilir. Öbür yandan farklı germe süreleri, farklı kas grupları ve farklı açısal hızlarda yapılacak ileri çalışmaların gerekliliği göz ardı edilmemelidir.

Anahtar Kelimeler

• Dinlenme aralığı,germe,izokinetik

Kaynakça

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