Abstract
This study examined the inter-day reliability and repeatability of change-of-direction (COD) performance to determine the minimum number of measurement trials required to represent a stable athlete...
Highlights
Change-of-direction (COD) ability is a key performance measurement in various sports, such as basketball, badminton and football (Gamble, 2012) and is recognised as the ability to accelerate, decelerate and change direction rapidly (Gamble, 2012; Sheppard & Young, 2006)
Measures which do not produce consistent results cannot be regarded as valid (Hopkins, 2000)
The reliability is defined as the number of trials necessary for estimating a population parameter value (Hopkins, 2000) and the number of trials required for reliable task representation is an important methodological consideration in studies and assessments involving COD manoeuvres
Summary
Change-of-direction (COD) ability is a key performance measurement in various sports, such as basketball, badminton and football (Gamble, 2012) and is recognised as the ability to accelerate, decelerate and change direction rapidly (Gamble, 2012; Sheppard & Young, 2006). In basketball step-off landing, James et al (2007) reported at least four measurements which were required to obtain stable and reliable ground reaction force results; In basketball lay-up, Chua, Quek, and Kong (2016) found that a minimum of eight measurements were required to obtain stable and reliable foot plantar pressure variables These findings suggest that the minimum number of trials would be specific to the movement tasks and thereby not applicable to other basketball COD tasks. Performance studies on COD movements employing two or three trials found that inferior performances (i.e. lower speed or increased completion time) were observed in the first trial than in the second or third trial (Hexagon agility test, Beekhuizen, Davis, Kolber, & Cheng, 2009; T-agility test, Chaouachi et al, 2009; Illinois agility test, Hachana et al, 2013) These findings imply that interpretations based on an average of three trials may not represent an athlete’s performance well. Based on the previous findings, it is hypothesised that increasing number of trials would result in better stability of the COD measurements and reliable mean and/or best trials from different data input methods
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