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Assessment of reliability in isokinetic testing among adolescent basketball players

(2011) MEDICINA-LITHUANIA. 47(8). p.446-452
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Abstract
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 60 degrees 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 60 s(-1) in adolescent basketball players. Age, maturity status, and training experience of young athletes should be considered when testing knee isokinetic strength at 60 degrees s(-1).
Keywords
VELOCITY, PROFILES, WRESTLERS, VARIABLES, PERFORMANCE, AGE, LEG STRENGTH, PEAK TORQUE, anthropometry, young athletes, strength, maturation, BIODEX, VALIDITY

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Chicago
Carvalho, Humberto M, Manuel Coelho e Silva, Enio Ricardo Vaz Ronque, Rui S Gonçalves, Renaat Philippaerts, and Robert M Malina. 2011. “Assessment of Reliability in Isokinetic Testing Among Adolescent Basketball Players.” Medicina-lithuania 47 (8): 446–452.
APA
Carvalho, Humberto M, Coelho e Silva, M., Vaz Ronque, E. R., Gonçalves, R. S., Philippaerts, R., & Malina, R. M. (2011). Assessment of reliability in isokinetic testing among adolescent basketball players. MEDICINA-LITHUANIA, 47(8), 446–452.
Vancouver
1.
Carvalho HM, Coelho e Silva M, Vaz Ronque ER, Gonçalves RS, Philippaerts R, Malina RM. Assessment of reliability in isokinetic testing among adolescent basketball players. MEDICINA-LITHUANIA. 2011;47(8):446–52.
MLA
Carvalho, Humberto M, Manuel Coelho e Silva, Enio Ricardo Vaz Ronque, et al. “Assessment of Reliability in Isokinetic Testing Among Adolescent Basketball Players.” MEDICINA-LITHUANIA 47.8 (2011): 446–452. Print.
@article{2060712,
  abstract     = {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 60 degrees 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{\textlangle}0.05) with eccentric knee extension within-variation between two sessions. Training experience (r=-0.37, P{\textlangle}0.05) and initial values of concentric knee flexion (r=-0.62, P{\textlangle}0.01) were correlated with concentric knee flexion within-subject differences. Within-subject variation of eccentric knee extension was correlated (P{\textlangle}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 60 s(-1) in adolescent basketball players. Age, maturity status, and training experience of young athletes should be considered when testing knee isokinetic strength at 60 degrees s(-1).},
  author       = {Carvalho, Humberto M and Coelho e Silva, Manuel and Vaz Ronque, Enio Ricardo and Gon\c{c}alves, Rui S and Philippaerts, Renaat and Malina, Robert M},
  issn         = {1010-660X},
  journal      = {MEDICINA-LITHUANIA},
  keyword      = {VELOCITY,PROFILES,WRESTLERS,VARIABLES,PERFORMANCE,AGE,LEG STRENGTH,PEAK TORQUE,anthropometry,young athletes,strength,maturation,BIODEX,VALIDITY},
  language     = {eng},
  number       = {8},
  pages        = {446--452},
  title        = {Assessment of reliability in isokinetic testing among adolescent basketball players},
  volume       = {47},
  year         = {2011},
}

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