Informace o publikaci
Comparing Horizontal Force-Velocity Profile Parameters Between Radar System and Motorised Resisted Device in Soccer Players
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| Rok publikování | 2025 |
| Druh | Konferenční abstrakty |
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| Popis | Background: Horizontal Force-Velocity profiling (H-FVP) is increasingly used in high-performance sport, specially in soccer, for individualized speed-strength diagnostics (Samozino et al., 2021). Among available technologies, the 1080 Sprint, a motorised resisted device, is considered a gold-standard field device to measure H-FVP, while the radar system remains more accessible and widely used. However, it is unclear whether radar derived FVP parameters (F0, V0, Pmax) provide comparable values to those from the 1080 Sprint when measured simultaneously. Methods: Twenty-one professional soccer players male completed two maximal sprint over 40 m using the 1080 Sprint in resisted mode (3 kg load). During each sprint, velocity-time data were simultaneously recorded using the Stalker ATS II radar positioned 5 m behind the athlete. From both devices, horizontal F0, V0 and Pmax were computed using the Samozino-Morin method. Agreement between devices was assessed using Pearson correlation coefficients, paired t-tests, mean differences (MD), and Bland-Altman limits of agreement (LoA). Statistics differences was considered p < 0.05. Results: Correlation coefficients between 1080 Sprint and Stalker radar outputs were classified as small across all variables (F0: r = 0.28; V0: r = 0.29; Pmax: r = 0.32). Paired t-tests showed significant systematic differences between devices, showing the radar consistently underestimated F0 (MD = 0.29 N·kg?1, p = 0.012), V0 (MD = -1.20 m·s?1, p < 0.001) and Pmax (MD = -1.64 W·kg?1, p < 0.001). Bland–Altman analysis revealed wide limits of agreement, particularly for V0 (LoA ? +0.15 to +2.25 m·s?1) and Pmax (LoA ? -1.05 to +4.33 W·kg?1), indicating substantial random error between devices at the individual level. Conclusion: The Stalker ATS II radar does not provide equivalent H-FVP outputs (F0, V0, Pmax) compared with the 1080 Sprint when used simultaneously during the same sprint trials. The magnitude of systematic bias and the wide limits of agreement suggest poor interchangeability between the two systems. Practitioners should therefore avoid mixing devices for athlete monitoring and should establish device specific reference values. When precise and consistent H-FVP assessment is required either for training prescription or research the 1080 Sprint remains the preferred option. |