Pınar ARPINAR, Emine KUTLAY, Can KOŞAY, Gülbin R. NALÇAKAN, Mustafa AKHİSAROĞLU, Cem Ş. BEDİZ

Ritmik cimmastikçilerde sıçrama yükseklikleri, izokinetik kuvvet ve EMG profillerinin karşılaştırılması

Bu çalışmada ritmik cimnastikçilerin tek ve çift bacak dikey sıçrama sırasında EMG verileri ile dikey sıçrama yükseklikleri ve izokinetik kuvvet ölçümleri arasındaki ilişki araştırılmıştır. On bir elit ritmik cimnastikçi gönüllü olarak çalışmaya katılmıştır. Deneklerin yaş, vücut ağırlığı ve vücut yağ yüzdeleri sırasıyla (ortalama±SS) 11.6±1.8yıl, 30.3±5.5 kg, 7.9±2.7 dir. Denekler Newtest platformu üzerinde üçer kez çift ve tek bacak üzerinde sıçrama yapmışlardır. Sıçrama sırasında sağ bacak quadriseps ve biseps femoris kaslarından yüzeyel elektrodlar ile EMG kayıtları alınmış (Biopac MP30), farklı bir günde ise 60, 180 ve 300 °/sn'de fleksiyon ve ekstansiyon izokinetik kuvvet ölçümleri yapılmıştır (Cybexll). EMG kayıtlarından medyan frekans (mf) ve "root mean square" (rms) hesaplamaları yapılmıştır. Dikey sıçrama yükseklikleri çift bacakla sıçramada 29.6±2.8 cm, tek bacak sıçramada ise 16.3±2.3 cm olarak bulunmuştur, izokinetik kuvvet ölçümleri sonucunda: sağ bacak fleksiyon pik tork 60,180 ve 300 o/sn sırasıyla 46.3±9.9, 38.3±9.4 ve 26.7±7.5 Nm; ekstansiyon pik tork 60,180 ve 300 °/sn ise sırasıyla 78.2±12.7, 53.3±12.4 ve 37.4±9.2 Nm olarak ölçülmüştür. Çift bacak ve tek bacak sıçrama yükseklikleri ile sağ biseps femoris rms değerleri arasında istatistiksel olarak anlamlı-ilişki bulunurken (p

Comparison of vertical jumping height, isokinetic strength and EMG profile in rhything gymnasts

The aim of the present study was to investigate the relationships between EMG records and vertical jumping scores and isokinetic strength on the preferred legs of the rhythmic gymnasts. Eleven elite rhythmic female gymnasts volunteered to participate to the study. The mean age, body weight and body fat percentage of the subjects were 11.6±1.8 years, 30.3±5.5 kg and 7.9±2.7 % (mean±SD), respectively. The subjects performed triple maximal vertical jumps on their preferred (right) leg and double legs on "Newtest" jumping platform. Surface EMG data of leg muscles (quadriceps femoris and biceps femoris) were recorded during the jumps (Biopac MP30). On a separate day, subjects performed flexio and extension muscle contractions at three randomly selected contraction velocities (60, 180 and 300 °/s) (Cybex II). The median frequencies (mf) and power spectrum analyses (rms) were done from EMG records. Mean jumping heights of one and double-leg jumps were 16.3+2.3 and29.6±2.8 cm, respectively. Right leg flexion peak torques at 60, 180 and 300 °/s were 46.3±9.9, 38.3±9.4 and 26.7±7.5 Nm; and, extension peak torques at 60, 180 and 300 °/s were 78.2+12.7, 53.3+12.4 and 37.4±9.2 Nm, respectively. A statistically significant correlation was found between jumping heights and right biceps femoris EMG rms values at both one and double-leg jumps (p

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