Elastic tapes are one of the functional equipments used for strength development. The purpose of this study was to determine the effects of resistance band trainings on swimming performance in 11-13 year old male swimming athletes. The swimmer who regularly swim for at least two years were at random divided 2 groups. Group1, swimming+thera-band (STG) (n=12, age= 12,00±0,60 years, height=147,75±8,12 cm, body weight=41,91±9,26 kg) participated 2 days swimming and swimming training plus 3 days resistance with theraband during 12 weeks while Group 2, swimming group (SG), (n=12, age=11,91±0,79 years, height=148,25±9,25cm body weight =43,50±9,05 kg) continued just 5 days swimming training per week. To evaluate the swimming performances of the groups, 50m, 100m, 150m and 200m freestyle transition tests with 25m, 50m freestyle swimming were measured before and after training. Wilcoxon paired test and Mann-Whitney U test were performed using the SPSS 15.0 statistical program in the analysis of the obtained data. At the end of the interview, significant decrease were found in both groups of 25m, 50m freestyle swimming grades and 200m grades (p<0,05). As a result of the findings, it can be said that therabant training which is done as a land work with swimming training leads to positive changes in the performance development of children aged 11-13 years.Extended English abstract is in the end of Full Text PDF (TURKISH) file.ÖzetElastik bantlar kuvvet gelişimi için kullanılan fonksiyonel ekipmanlardan biridir. Bu araştırma, yaşları 11-13 arasında olan erkek yüzme sporcularında direnç bandı antrenmanının yüzme performansına etkilerini belirlemek amacıyla yapılmıştır. Düzenli olarak en az iki yıl yüzme antrenmanı yapan erkek yüzücüler rastgele iki gruba ayrılmıştır. 1. Grup yüzme+thera-band (YTG) (n=12, yaş=12,00±0,60 yıl, boy=147,75±8,12 cm, v.ağ=41,91±9,26 kg) 12 hafta boyunca haftada 2 gün yüzme, 3 gün de yüzmeye ek olarak therabant ile kuvvet antrenmanı 2. Grup yüzme (YG) (n=12, yaş=11,91±0,79 yıl, boy=148,25±9,25cm v.ağ=43,50±9,05 kg) haftada 5 gün sadece yüzme antrenmanları uygulanmıştır. Grupların yüzme performanslarını değerlendirmek için 25m, 50m serbest stil yüzme ile 50m, 100m, 150m ve 200m serbest stil geçiş testleri antrenman öncesi ve sonrası ölçülmüştür. Bulgular SPSS 15.0 istatistik paket programında analiz edilmiş ve parametrik olmayan analizlerden Mann Whitney U testi ile Wilcoxon İkili İlişki testi uygulanmıştır. Araştırmanın sonunda her iki grubunda 25m, 50m serbest stil yüzme dereceleri ile 200m yüzme derecelerinde anlamlı azalmalar bulunmuştur (p<0,05). Elde edilen bulgular neticesinde, yüzme antrenmanları ile birlikte kara çalışması olarak yaptırılan therabant antrenmanlarının 11-13 yaşları arasındaki çocukların performans gelişimlerinde olumlu değişimlere neden olduğu söylenebilir.Elastic tapes are one of the functional equipments used for strength development. The purpose of this study was to determine the effects of resistance band trainings on swimming performance in 11-13 year old male swimming athletes. The swimmer who regularly swim for at least two years were at random divided 2 groups. Group1, swimming+thera-band (STG) (n=12, age= 12,00±0,60 years, height=147,75±8,12 cm, body weight=41,91±9,26 kg) participated 2 days swimming and swimming training plus 3 days resistance with theraband during 12 weeks while Group 2, swimming group (SG), (n=12, age=11,91±0,79 years, height=148,25±9,25cm body weight =43,50±9,05 kg) continued just 5 days swimming training per week. To evaluate the swimming performances of the groups, 50m, 100m, 150m and 200m freestyle transition tests with 25m, 50m freestyle swimming were measured before and after training. Wilcoxon paired test and Mann-Whitney U test were performed using the SPSS 15.0 statistical program in the analysis of the obtained data. At the end of the interview, significant decrease were found in both groups of 25m, 50m freestyle swimming grades and 200m grades (p<0,05). As a result of the findings, it can be said that therabant training which is done as a land work with swimming training leads to positive changes in the performance development of children aged 11-13 years.