Abstract
The purpose of this study was to investigate the between-session reliability of common strength- and power-related measures in adolescent athletes. Seventeen adolescent athletes (males: n = 8: age 17.1 ± 2.2 years; height 175.6 ± 3.5 cm; mass 80.2 ± 3.6 kg; females: n = 9; age 16.9 ± 2.6 years; height 178.5 ± 4.3 cm; mass 71.5 ± 4.5 kg) participated in this study. Isokinetic dynamometry, isometric mid-thigh pull (IMTP), countermovement jump (CMJ), and horizontal jumps (standing broad jump (SBJ) and single-leg hop (SLH)) were each performed twice on separate days, seven days apart. Reliability was assessed by intraclass correlation coefficient (ICC), coefficient of variation (%CV), standard error of measurement (SEM), and smallest detectable difference (SDD). Intraclass correlation coefficients and CV demonstrated acceptable between-session reliability for all measures (ICC > 0.63; CV < 11%), except rate of force development and impulse measures during bilateral and unilateral stance IMTP. Smallest detectable differences demonstrated that changes in performance of >7% CMJ height, >8% SLH distance, >10% in peak isometric force, and >5% in isokinetic peak torques should be considered meaningful, when assessing adolescent athletes.
Highlights
The assessment of physical capabilities such as strength and power plays an important role in the evaluation of training effects
Athletes attended the human performance laboratory on two occasions separated by one week, at the same time of day, to determine between-session reliability of isokinetic dynamometry, isometric mid-thigh pull (IMTP), countermovement jump (CMJ), and horizontal jump tests
This study showed that between-session reliability was acceptable (ICC ≥ 0.50; “strong”) for all strength- and power-related variables, excluding
Summary
The assessment of physical capabilities such as strength and power plays an important role in the evaluation of training effects. Strength and power are key determinants in sporting success [2], but there is a need to accurately assess these qualities in adolescent athletes through valid and reliable testing protocols, such as isokinetic dynamometry, isometric mid-thigh pull, countermovement, and horizontal jump tests. The standard error of measurement (SEM) provides a direct measure of the amount of error associated with the test, which can be represented as a percentage of variation in an athlete’s mean score (%CV) [3]. These measurements allow strength and conditioning coaches and sport scientists to make sound conclusions about whether the changes seen in response to a training
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