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ORIGINAL ARTICLES  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2016 November;56(11)1261-8

Copyright © 2016 EDIZIONI MINERVA MEDICA

lingua: Inglese

The relation between knee muscle strength and performance tests in orienteering athletes

Özge ÇINAR-MEDENİ 1, Fatma F. COLAKOGLU 2, Koray YÜCE 3, Gökhan İPEKOĞLU 2, Gul BALTACI 3

1 Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Çankırı Karatekin University, Çankırı, Turkey; 2 Faculty of Sport Sciences, Gazi University, Ankara, Turkey; 3 Güven Hospital, Ankara, Turkey


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BACKGROUND: The aim of this study was to analyze the effect of knee muscle strength on performance tests in orienteers.
METHODS: Thirty-seven orienteers were voluntarily included in this study. Isokinetic knee flexor and extensor muscles’ strength was assessed at 120°/s velocity for both “dominant leg” (DL) and “non-dominant leg” (NDL). “Single-legged hop test” (SLHT), “flamingo balance test” (FBT), “star excursion balance test” (SEBT), vertical jump-and-reach test (for anaerobic power), T-drill test and 20-meter shuttle run test (for aerobic power) were carried out. Correlation and regression analyses were performed on the data.
RESULTS: VO2max levels showed moderate correlations with DL’s “flexor peak torque” (FPT) and NDL’s “extensor peak torque” (EPT) and FPT values respectively (r=0.49, r=0.38, r=0.58). FPT of NDL was a predictor of VO2max level (R2=0.33). Anaerobic power has a relationship with EPT of NDL (r=0.43) and T-drill test with EPT and FPT values of both DL and NDL respectively (r=-0.35, r=-0.63, r=-0.53, r=-0.58). EPT of NDL was a predictor for anaerobic power (R2=0.19) and FPT of DL for agility (R2=0.40). Nonparametric linear regression results showed that EPT is a predictor in DL (median slope=-0.71, P=0.01), and FPT in NDL (median slope=-0.90, P=0.006) for FBT. FPT was a predictor of SEBT scores for both legs (0.13 < R2 <0.27) except for posterolateral direction in NDL. For SLHT, EPT was determiner in DL (R2=0.21), FPT was determiner in NDL (R2=0.30).
CONCLUSIONS: Evaluation and improvement of knee flexor and extensor muscle strength are of importance to improve orienteering performance.

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