The Arrowhead Agility Test: Reliability, Minimum Detectable Change, and Practical Applications in Soccer Players

Area of Science:

• Sports Science
• Biomechanics
• Performance Analysis

Background:

• Change of direction (COD) capacity is crucial for soccer performance.
• The arrowhead agility test (AAT) is a potential tool for assessing COD in athletes.
• Understanding the reliability and validity of the AAT is essential for its practical application.

Purpose of the Study:

• To evaluate the intersession reliability and minimum detectable change of the AAT in soccer players.
• To investigate the relationship between power-dependent abilities and AAT performance.
• To assess the AAT's sensitivity to fatigue and its ability to differentiate between competitive levels and age groups.

Main Methods:

• Four independent studies were conducted involving soccer players (n=24 to 264).
• Methods included reliability testing, correlation with power-based measures, fatigue induction protocols, and comparisons across competitive levels and age groups.
• Statistical analyses included ICC, CV, smallest worthwhile change, SEM, and effect sizes.

Main Results:

• The AAT demonstrated good intersession reliability (ICC = 0.80-0.83) and low minimum detectable change, except for the asymmetry index.
• A 15-m sprint explained significant variance in COD (R=0.42).
• COD performance decreased with match-induced fatigue in the second half and post-game, but not at halftime.
• National-level and older players (U18, senior) exhibited superior agility compared to regional and younger (U16) players.

Conclusions:

• The arrowhead agility test is a reliable and valid measure of COD capacity in soccer players.
• The AAT is sensitive to fatigue accumulated during matches and can distinguish between players of varying competitive levels and age groups.
• The AAT can be integrated with 15-m sprint testing but should be administered separately from countermovement jump assessments.