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Five common sprint systems show high reliability for measuring maximal velocity and force-velocity variables. While maximal velocity measurements were similar, time constants varied, with early acceleration data showing greater error across systems.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Performance Analysis

Background:

  • Accurate measurement of sprint performance is crucial for athlete assessment and training.
  • Various on-field technologies exist, but their comparative validity and reliability for sprint acceleration are not fully understood.

Purpose of the Study:

  • To compare five common on-field systems (motorized linear encoder, laser, radar, global positioning system, and timing gates) for sprint acceleration.
  • To evaluate their ability to measure velocity-time data and compute force-velocity variables.
  • To assess the inter-trial reliability of these systems.

Main Methods:

  • Eighteen participants completed three 40m sprints.
  • Five systems simultaneously recorded horizontal position/velocity of the body's center of mass.
  • Force-velocity outputs were calculated using an inverse dynamic model and exponential fitting.

Main Results:

  • Maximal running velocity was consistent across systems (7.99–8.04 m/s), but time constants varied (1.18–1.29 s).
  • Concurrent validity showed low systematic errors for maximal velocity (0.86–2.28%) but higher errors for early acceleration (4.78–12.9%).
  • Inter-trial reliability was high for all systems, with coefficients of variation below 5.74%.

Conclusions:

  • All tested systems are relevant for measuring maximal velocity and calculating force-velocity outputs during sprint acceleration.
  • Practitioners should consider the observed differences in time constants and early acceleration validity when interpreting data.
  • High inter-trial reliability suggests consistent performance measurement across these technologies.