Turkiye Klinikleri Journal of Sports Sciences

.: ORIGINAL RESEARCH
The Relationship Between Reactive Strength Index and Acceleration, Sprint, Change of Direction Performance and Leg Strength in Football Players: Descriptive Research
Futbolcularda Reaktif Kuvvet İndeksi ile İvmelenme, Sprint, Yön Değiştirme Performansı ve Bacak Kuvveti Arasındaki İlişki: Tanımlayıcı Araştırma
Gizem BAŞKAYAa , Kamil UZGURa , Sare BOSTANCIb , Okan KAMİŞc
aBandırma Onyedi Eylül University Faculty of Sport Sciences, Department of Coaching Education, Balıkesir, Türkiye
bBandırma Onyedi Eylül University Manyas Vocational School, Department of Property Protection and Security, Balıkesir, Türkiye
cAksaray University Faculty of Sports Sciences, Department of Sports and Health, Aksaray, Türkiye
Turkiye Klinikleri J Sports Sci. 2024;16(1):46-52
doi: 10.5336/sportsci.2023-99125
Article Language: EN
Full Text
ABSTRACT
 Objective: The aim of this study was to determine the relationship between reactive strength index and leg strength, acceleration, sprint, change of direction and eccentric utilisation rate parameters of young football players. Material and Methods: A total of 23 football players who competed in the U17 league in the 2022-2023 season voluntarily participated in the study. Height and body weight measurements were used to determine the physical parameters of the footballers and right-left leg strength, drop jump, countermovement jump, squat jump, 10 m acceleration, 40 m sprint and illinois agility tests were used as performance tests. Reactive strength index and eccentric utilisation ratio were calculated with the data obtained from jump tests. The normal distribution of the data was analysed by Shapiro-Wilks test and the relationship between the variables was determined by Pearson correlation test. Results: Significant relationships were found between reactive strength index and eccentric utilisation ratio (r=0.547; p<0.05), right leg average strength (r=0.451; p<0.05) and left leg average strength (r=0.436; p<0.05). No significant correlation was found between reactive strength index and acceleration, sprint, change of direction and right-left leg peak strength performances (p>0.05). Conclusion: In conclusion, it can be suggested that the reactive strength index parameter should be taken into consideration in the evaluation process of strength and eccentric utilisation rate of young football players.

Keywords: Football; reactive strength index; sprint; strength; change of direction
ÖZET
 Amaç: Bu çalışmanın amacı, genç futbolcuların reaktif kuvvet indeksi ile bacak kuvveti, ivmelenme, sprint, yön değiştirme ve eksantrik kullanım oranı parametreleri arasındaki ilişkiyi belirlemektir. Gereç ve Yöntemler: Çalışmaya 2022-2023 sezonunda U17 liginde mücadele eden toplam 23 futbolcu gönüllü olarak katılmıştır. Futbolcuların fiziksel parametrelerini belirlemek için boy ve vücut ağırlığı ölçümleri, performans testleri olarak ise sağ-sol bacak kuvveti, ''drop jump, countermovement jump, squat jump'', 10 m ivmelenme, 40 m sprint ve illinois çeviklik testleri kullanıldı. Sıçrama testlerinden elde edilen veriler ile reak tif kuvvet indeksi ve eksantrik kullanım oranı hesaplanmıştır. Verilerin normal dağılımı Shapiro-Wilks testi ile analiz edilmiş ve değişkenler arasındaki ilişki Pearson korelasyon testi ile belirlenmiştir. Bulgular: Genç futbolcuların reaktif kuvvet indeksi ile eksantrik kullanım oranı (r=0,547; p<0,05), sağ bacak ortalama kuvveti (r=0,451; p<0,05) ve sol bacak ortalama kuvveti (r=0,436; p<0,05) arasında anlamlı ilişkiler bulunmuştur. Reaktif kuvvet indeksi ile ivmelenme, sprint, yön değiştirme ve sağ-sol bacak zirve kuvvet performansları arasında anlamlı bir korelasyon bulunmamıştır (p>0,05). Sonuç: Sonuç olarak, genç futbolcuların kuvvet ve eksantrik kullanım oranı değerlendirme sürecinde reaktif kuvvet indeksi parametresinin dikkate alınması önerilebilir.

Anahtar Kelimeler: Futbol; reaktif kuvvet indeksi; sprint; kuvvet; yön değiştirme
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