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Assessment of Reliability in Isokinetic Testing Among Adolescent Basketball Players

Humberto M. Carvalho
Manuel J. Coelho E Silva
Enio Ricardo Vaz Ronque
Rui S. Gonçalves
Renaat M. Philippaerts
4 and
Robert M. Malina
Faculty of Sport Science and Physical Education, University of Coimbra, Portugal
Department of Physical Education, Universidade Estadual de Londrina, Brazil
College of Health Technology, Polytechnic Institute of Coimbra, Portugal
Faculty of Medicine and Health Sciences, Department of Movement and Sports Sciences, Ghent University, Belgium
Department of Kinesiology, University of Texas at Austin, Texas, USA
Department of Health and Physical Education, Tarleton State University, Stephenville, Texas, USA
Author to whom correspondence should be addressed.
Medicina 2011, 47(8), 446;
Submission received: 16 April 2011 / Accepted: 31 August 2011 / Published: 5 September 2011


Background. The reproducibility of day-to-day testing of isokinetic concentric and eccentric muscular actions among adolescent basketball players aged 14 to 16 years and relationships of mean within-subject variation in two isokinetic testing sessions with chronological age, biological maturation (estimated age at peak height velocity), training experience, body size, lower-body morphology, and initial strength performance were evaluated.
Material and Methods
. The sample included 27 basketball players who completed replicate test sessions of 5 repetitions of reciprocal concentric and eccentric knee extensions and flexions at 60º s–1. A randomly selected subsample of 8 players completed a third testing session to confirm reliability estimates.
Results. Coefficients of variation (CV) between sessions 1 and 2 ranged from 8.1% to 17.4%, and intraclass coefficients (ICCs) ranged from 0.72 to 0.89. For sessions 1 and 3, CVs ranged from 3.9% to 6.0%, and ICCs ranged from 0.95 to 0.99. The initial level of strength of eccentric knee flexion (r=–0.43) and eccentric knee extension (r=–0.42) were correlated (P<0.05) with eccentric knee extension within-variation between two sessions. Training experience (r=–0.37, P<0.05) and initial values of concentric knee flexion (r=–0.62, P<0.01) were correlated with concentric knee flexion within-subject differences. Within-subject variation of eccentric knee extension was correlated (P<0.05) with chronologic age (r=0.41), estimated age at peak height velocity (r=–0.38), body size (r=0.41 to 0.47), and leg volume (r=0.39).
Conclusions. Familiarization sessions may improve the reliability of concentric and eccentric knee isokinetic strength testing at 60º s–1 in adolescent basketball players. Age, maturity status, and training experience of young athletes should be considered when testing knee isokinetic strength at 60º s–1.
Keywords: maturation; strength; young athletes; anthropometry maturation; strength; young athletes; anthropometry

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MDPI and ACS Style

Carvalho, H.M.; Coelho E Silva, M.J.; Ronque, E.R.V.; Gonçalves, R.S.; Philippaerts, R.M.; Malina, R.M. Assessment of Reliability in Isokinetic Testing Among Adolescent Basketball Players. Medicina 2011, 47, 446.

AMA Style

Carvalho HM, Coelho E Silva MJ, Ronque ERV, Gonçalves RS, Philippaerts RM, Malina RM. Assessment of Reliability in Isokinetic Testing Among Adolescent Basketball Players. Medicina. 2011; 47(8):446.

Chicago/Turabian Style

Carvalho, Humberto M., Manuel J. Coelho E Silva, Enio Ricardo Vaz Ronque, Rui S. Gonçalves, Renaat M. Philippaerts, and Robert M. Malina. 2011. "Assessment of Reliability in Isokinetic Testing Among Adolescent Basketball Players" Medicina 47, no. 8: 446.

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