ArticleFrontiers in physiology2026
Reliability and sensitivity of mechanical properties of phase-specific during the 505-test using a radar device in soccer players.
Article in Frontiers in physiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Change-of-direction (COD) ability is a key determinant of soccer performance. This study evaluated the intra- and inter-day reliability and sensitivity of a single-radar device (SRD) for capturing phase-specific kinetics and kinematics during the 505 tests in 24 youth soccer players. Intra-day results showed high reliability for maximum velocity (Vmax, ICC = 0.67, CV = 1.51%) and moderate-to-high reliability for kinetic variables (P2_HBF avg and P3_HAP avg, ICC = 0.58-0.59). However, all intra-day metrics exhibited "Marginal" usefulness as Typical Error (TE) consistently exceeded the Smallest Worthwhile Change (SWC). In contrast, inter-day reliability was substantially higher, particularly for kinetic indicators such as braking impulse (P2_HBI avg, ICC = 0.90) and re-acceleration force (P3_HAF max, ICC = 0.91). Furthermore, inter-day assessment revealed "Good" usefulness (TE≤SWC) for key metrics, including P2_HBIavg, P3_HAFavg/max, and re-acceleration distance/velocity. These results indicate that while intra-day stability is limited by movement variability, RRDs provide sufficient precision for individualized monitoring across testing days. Practitioners should prioritize inter-day kinetic profiles and incorporate familiarization to maximize diagnostic accuracy in youth soccer populations.
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